1
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Barman M, Mishra M, Mandal S, Punniyamurthy T. Palladium Catalysis Enabled Sequential C(sp 3)-H/C-C Activation: Access to Vinyl γ-Lactams. Org Lett 2024; 26:3722-3726. [PMID: 38678543 DOI: 10.1021/acs.orglett.4c00710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2024]
Abstract
A Pd(II)-catalyzed tandem reaction of aliphatic amides with vinylcyclopropanes (VCPs) was accomplished by merging C(sp3)-H and C-C activation. The reaction of VCP revealed alkenylation/cyclization, followed by ring opening via C-C cleavage, delivering vinyl γ-lactams with (E)-selectivity. The role of ligands, site-selectivity, functional group diversity, mechanistic insight, and synthetic utilities are important practical features.
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Affiliation(s)
- Madhab Barman
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India
| | - Manmath Mishra
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India
| | - Santu Mandal
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India
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2
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Madiu R, Doran EL, Doran JM, Pinarci AA, Dhillon K, Rivera DA, Howard AM, Stroud JL, Moskovitz DA, Finneran SJ, Singer AN, Rossi ME, Moura-Letts G. Synthesis of N-Tosyl Allylic Amines from Substituted Alkenes via Vanadoxaziridine Catalysis. J Org Chem 2024; 89:4001-4008. [PMID: 38407036 PMCID: PMC10949238 DOI: 10.1021/acs.joc.3c02859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/30/2024] [Accepted: 02/06/2024] [Indexed: 02/27/2024]
Abstract
Herein, we report the catalytic allylic amination of α-methylalkenes with V2O3Dipic2(HMPA)2 and chloramine T as the quantitative source of N. The reaction works with high yields and stereoselectivities for α-methylalkenes. A proposed tosylnitrene-free catalytic cycle involving the formation of vanadoxaziridine complex 1 as the active catalyst and aminovanadation across the substrate as the rate-determining step has been proposed. Initial kinetic and competition experiments provide evidence for the proposed mechanism.
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Affiliation(s)
- Rufai Madiu
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Erin L. Doran
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Jenna M. Doran
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Ali A. Pinarci
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Kiran Dhillon
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Dominic A. Rivera
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Amari M. Howard
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - James L. Stroud
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Dylan A. Moskovitz
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Steven J. Finneran
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Alyssa N. Singer
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Morgan E. Rossi
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
| | - Gustavo Moura-Letts
- Department of Chemistry and
Biochemistry, Rowan University, 201 Mullica Hill Rd., Glassboro, New Jersey 08028, United States
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3
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Dinuclear Silver(I) and Gold(I) Complexes with Chiral Oxazoline-NHC Ligands. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Chu WD, Liang TT, Ni H, Dong ZH, Shao Z, Liu Y, He CY, Bai R, Liu QZ. Palladium-Catalyzed Intermolecular Asymmetric Dearomative Annulation of Phenols with Vinyl Cyclopropanes. Org Lett 2022; 24:4865-4870. [PMID: 35775729 DOI: 10.1021/acs.orglett.2c01594] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, we report the Pd(0)-catalyzed intermolecular asymmetric dearomative [3 + 2] annulation of phenols with vinyl cyclopropanes via in situ generated ortho-quinone methide intermediates. A series of highly functionalized spiro-[5,6] bicycles which bear three contiguous stereogenic centers including one all-carbon quaternary were obtained with excellent stereoselectivities. Density functional theory (DFT) calculations indicate that the reactions were controlled by thermodynamics.
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Affiliation(s)
- Wen-Dao Chu
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, No. 1, Shida Road, Nanchong 637002, P. R. China.,Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan Provincial Center for Research & Development of Natural Products, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming 650091, P. R. China
| | - Tian-Tian Liang
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, No. 1, Shida Road, Nanchong 637002, P. R. China
| | - Hao Ni
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, P. R. China
| | - Zhi-Hong Dong
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, No. 1, Shida Road, Nanchong 637002, P. R. China
| | - Zhihui Shao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan Provincial Center for Research & Development of Natural Products, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming 650091, P. R. China
| | - Yong Liu
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, No. 1, Shida Road, Nanchong 637002, P. R. China
| | - Cheng-Yu He
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, No. 1, Shida Road, Nanchong 637002, P. R. China
| | - Ruopeng Bai
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, P. R. China
| | - Quan-Zhong Liu
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, No. 1, Shida Road, Nanchong 637002, P. R. China
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5
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Acceptorless dehydrogenative amination of alkenes for the synthesis of N-heterocycles. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1241-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Dhayalan V, Dandela R, Devi KB, Dhanusuraman R. Synthesis and Applications of Asymmetric Catalysis Using Chiral Ligands Containing Quinoline Motifs. SYNOPEN 2022. [DOI: 10.1055/a-1743-4534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
In the past decade, asymmetric synthesis of chiral ligands containing quinoline motifs, a family of natural products displaying a broad range of structural diversity and their metal complexes have become the most significant methodology for the generation of enantiomerically pure compounds of biological and pharmaceutical interest. This review provides comprehensive insight on the plethora of nitrogen-based chiral ligands containing quinoline motifs and organocatalysts used in asymmetric synthesis. However, it is circumscribed to the synthesis of quinoline-based chiral ligands and metal complexes, and their applications in asymmetric synthesis as a homogeneous and heterogeneous catalyst.
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Affiliation(s)
- Vasudevan Dhayalan
- Department of Chemistry, National Institute of Technology Puducherry, Karaikal, India
| | - Rambabu Dandela
- Dept. of Industrial and Engineering Chemistry, Institute of Chemical Technology- IOC Bhubaneswar, Bhubaneswar, India
| | - K. Bavya Devi
- Department of Chemistry, Thassim Beevi Adbul Kader College for Women, Kilakarai, India
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7
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Yang X, Chen P, Liu G. Asymmetric Palladium-Catalyzed Aza-Wacker Reaction of Alkenes: Efficient Synthesis of Chiral 1,3-Oxazinan-2-ones. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202208021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Mechanistically guided survey of enantioselective palladium-catalyzed alkene functionalization. TRENDS IN CHEMISTRY 2021. [DOI: 10.1016/j.trechm.2021.07.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Zhai L, Tang Y, Zhang Y, Huang SH, Zhu L, Hong R. A Bridge to Alkaloid Synthesis. CHEM REC 2021; 22:e202100197. [PMID: 34473401 DOI: 10.1002/tcr.202100197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 08/23/2021] [Indexed: 11/07/2022]
Abstract
The construction of a structurally rigid architecture with chiral complexity, necessary to enhance the interaction with binding sites of drug targets, has been adapted as an intriguing approach in drug development. In the past few years, we have been interested in the synthesis of biologically significant and bridged alkaloids via novel synthetic methods and strategies based on recognition of the privileged pattern. Therefore, nitroso-ene and aza-Wacker cyclizations were elevated for the first time to construct bridged alkaloids, such as hosieine A, kopsone, melinonine-E and strychnoxanthine. Mechanistic investigations, including computational calculations for nitroso-ene reaction and deuterated experiments for aza-Wacker reaction, enable us to gain more insights into the chemical reactivity and selectivity of specific functional groups in developing viable synthetic methods.
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Affiliation(s)
- Li Zhai
- Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai, 201203, PR China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing 101419, PR China, CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (CAS), 345 Lingling Road, Shanghai, 200032, PR China
| | - Ye Tang
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing 101419, PR China, CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (CAS), 345 Lingling Road, Shanghai, 200032, PR China
| | - Yan Zhang
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing 101419, PR China, CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (CAS), 345 Lingling Road, Shanghai, 200032, PR China
| | - Sha-Hua Huang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai, 201418, PR China
| | - Lili Zhu
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing 101419, PR China, CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (CAS), 345 Lingling Road, Shanghai, 200032, PR China
| | - Ran Hong
- Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai, 201203, PR China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing 101419, PR China, CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (CAS), 345 Lingling Road, Shanghai, 200032, PR China
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10
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Saha S, Yadav S, Reshi NUD, Dutta I, Kunnikuruvan S, Bera JK. Electronic Asymmetry of an Annelated Pyridyl–Mesoionic Carbene Scaffold: Application in Pd(II)-Catalyzed Wacker-Type Oxidation of Olefins. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02729] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sayantani Saha
- Department of Chemistry and Center for Environmental Science, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Suman Yadav
- Department of Chemistry and Center for Environmental Science, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Noor U Din Reshi
- Department of Chemistry and Center for Environmental Science, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Indranil Dutta
- Department of Chemistry and Center for Environmental Science, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Sooraj Kunnikuruvan
- Department of Chemistry and Center for Environmental Science, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Jitendra K. Bera
- Department of Chemistry and Center for Environmental Science, Indian Institute of Technology Kanpur, Kanpur 208016, India
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11
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Sen A, Zhu L, Takizawa S, Takenaka K, Sasai H. Synthesis of Allylamine Derivatives
via
Intermolecular Aza‐Wacker‐Type Reaction Promoted by Palladium‐SPRIX Catalyst. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Abhijit Sen
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
- Present Address: RIKENCenter for Sustainable Resource Science Wako Saitama 351-0198 Japan
| | - Linpeng Zhu
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
| | - Shinobu Takizawa
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
| | - Kazuhiro Takenaka
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
- Present Address: National Institute of TechnologyKagawa College 551 Kohda, Takuma-cho, Mitoyo-shi Kagawa 769-1192 Japan
| | - Hiroaki Sasai
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
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12
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Thomas AA, Nagamalla S, Sathyamoorthi S. Salient features of the aza-Wacker cyclization reaction. Chem Sci 2020; 11:8073-8088. [PMID: 34123081 PMCID: PMC8163389 DOI: 10.1039/d0sc02554b] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 07/20/2020] [Indexed: 11/23/2022] Open
Abstract
The intramolecular aza-Wacker reaction has unparalleled potential for the site-selective amination of olefins, but it is perhaps underappreciated relative to other alkene oxidations. The first part of this review makes the distinction between classical and tethered aza-Wacker cyclization reactions and summarizes examples of the latter. The second portion focuses on developments in asymmetric aza-Wacker cyclization technology. The final part of the review summarizes applications of all classes of aza-Wacker cyclization reactions to natural product assembly.
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Affiliation(s)
- Annu Anna Thomas
- Department of Medicinal Chemistry, University of Kansas Lawrence KS USA
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13
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Siddiqui AM, Khalid A, Khan A, Azad CS, Samim M, Khan IA. N‐Heterocyclic Carbene/Cobalt Cooperative Catalysis for the Chemo‐ and Regioselective C−N Bond Formation between Aldehyde and Amines/Amides. ChemCatChem 2020. [DOI: 10.1002/cctc.202000156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Asher M. Siddiqui
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
| | - Anam Khalid
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
| | - Arif Khan
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
| | - Chandra S. Azad
- School of Pharmaceutical Science and Technology Tianjin University Tianjin 300072 P.R. China
| | - Mohd. Samim
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
| | - Imran A. Khan
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
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14
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Fernandes RA, Jha AK, Kumar P. Recent advances in Wacker oxidation: from conventional to modern variants and applications. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01820a] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Recent developments in the well-known Wacker oxidation process from conventional to modern variants and applications to natural products' synthesis are compiled in this review.
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Affiliation(s)
- Rodney A. Fernandes
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Amit K. Jha
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Praveen Kumar
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
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15
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Recent advances in Pd-catalyzed asymmetric addition reactions. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2020.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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16
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Berthold D, Geissler AGA, Giofré S, Breit B. Rhodium‐Catalyzed Asymmetric Intramolecular Hydroamination of Allenes. Angew Chem Int Ed Engl 2019; 58:9994-9997. [DOI: 10.1002/anie.201904833] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Dino Berthold
- Institut für Organische ChemieAlbert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg im Breisgau Germany
| | - Arne G. A. Geissler
- Institut für Organische ChemieAlbert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg im Breisgau Germany
| | - Sabrina Giofré
- Institut für Organische ChemieAlbert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg im Breisgau Germany
| | - Bernhard Breit
- Institut für Organische ChemieAlbert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg im Breisgau Germany
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17
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Berthold D, Geissler AGA, Giofré S, Breit B. Rhodium‐Catalyzed Asymmetric Intramolecular Hydroamination of Allenes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904833] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Dino Berthold
- Institut für Organische ChemieAlbert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg im Breisgau Germany
| | - Arne G. A. Geissler
- Institut für Organische ChemieAlbert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg im Breisgau Germany
| | - Sabrina Giofré
- Institut für Organische ChemieAlbert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg im Breisgau Germany
| | - Bernhard Breit
- Institut für Organische ChemieAlbert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg im Breisgau Germany
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18
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Bahamonde A, Rifaie BA, Martín-Heras V, Allen JR, Sigman MS. Enantioselective Markovnikov Addition of Carbamates to Allylic Alcohols for the Construction of α-Secondary and α-Tertiary Amines. J Am Chem Soc 2019; 141:8708-8711. [PMID: 31124676 PMCID: PMC6583784 DOI: 10.1021/jacs.9b03438] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein we describe the development of a Pd-catalyzed enantioselective Markovnikov addition of carbamates to allylic alcohols for the construction of α-tertiary and α-secondary amines. The reaction affords a range of β-amino alcohols, after reduction of the aldehyde in situ, which contain a variety of functional groups in moderate yields and moderate to good enantioselectivities. These products can be readily oxidized to β-amino acids, valuable building blocks for the synthesis of biologically active compounds. Mechanistic studies indicate that the C-N bond formation occurs via a syn amino-palladation mechanism, an insight which may guide future reaction development given the limited number of enantioselective syntheses of α-tertiary amines.
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Affiliation(s)
| | | | - Victor Martín-Heras
- Department of Chemistry, University of Utah, 315 S 1400 E, Salt Lake City, UT 84112, United States
| | - Jamie R. Allen
- Department of Chemistry, University of Utah, 315 S 1400 E, Salt Lake City, UT 84112, United States
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, 315 S 1400 E, Salt Lake City, UT 84112, United States
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19
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Tian Q, Liu Y, Wang X, Wang X, He W. Pd II
/Novel Chiral Cinchona Alkaloid Oxazoline-Catalyzed Enantioselective Oxidative Cyclization of Aromatic Alkenyl Amides. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900431] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Qinqin Tian
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Yulong Liu
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Xiaoyun Wang
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Xie Wang
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Wei He
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
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20
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Allen JR, Bahamonde A, Furukawa Y, Sigman MS. Enantioselective N-Alkylation of Indoles via an Intermolecular Aza-Wacker-Type Reaction. J Am Chem Soc 2019; 141:8670-8674. [PMID: 31117643 DOI: 10.1021/jacs.9b01476] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The development of an intermolecular and enantioselective aza-Wacker reaction is described. Using indoles as the N-source and a selection of alkenols as the coupling partners selective β-hydride elimination toward the alcohol was achieved. This strategy preserves the newly formed stereocenter by preventing the formation of traditionally observed enamine products. Allylic and homoallylic alcohols with a variety of functional groups are compatible with the reaction in high enantioselectivity. Isotopic-labeling experiments support a syn amino-palladation mechanism for this new class of aza-Wacker reactions.
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Affiliation(s)
- Jamie R Allen
- Department of Chemistry , University of Utah , 315 S 1400 E , Salt Lake City , Utah 84112 , United States
| | - Ana Bahamonde
- Department of Chemistry , University of Utah , 315 S 1400 E , Salt Lake City , Utah 84112 , United States
| | - Yukino Furukawa
- Department of Chemistry , University of Utah , 315 S 1400 E , Salt Lake City , Utah 84112 , United States
| | - Matthew S Sigman
- Department of Chemistry , University of Utah , 315 S 1400 E , Salt Lake City , Utah 84112 , United States
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21
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Zhang T, Shen HC, Xu JC, Fan T, Han ZY, Gong LZ. Pd(II)-Catalyzed Asymmetric Oxidative Annulation of N-Alkoxyheteroaryl Amides and 1,3-Dienes. Org Lett 2019; 21:2048-2051. [DOI: 10.1021/acs.orglett.9b00216] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tao Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Hong-Cheng Shen
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Jia-Cheng Xu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Tao Fan
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Zhi-Yong Han
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
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22
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Ma X, Hazelden IR, Langer T, Munday RH, Bower JF. Enantioselective Aza-Heck Cyclizations of N-(Tosyloxy)carbamates: Synthesis of Pyrrolidines and Piperidines. J Am Chem Soc 2019; 141:3356-3360. [DOI: 10.1021/jacs.8b12689] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaofeng Ma
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom
| | - Ian R. Hazelden
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom
| | - Thomas Langer
- Pharmaceutical Technology & Development, AstraZeneca, Charter Way, Macclesfield, SK10 2NA, United Kingdom
| | - Rachel H. Munday
- Pharmaceutical Technology & Development, AstraZeneca, Charter Way, Macclesfield, SK10 2NA, United Kingdom
| | - John F. Bower
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom
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23
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Hickey DP, Sandford C, Rhodes Z, Gensch T, Fries LR, Sigman MS, Minteer SD. Investigating the Role of Ligand Electronics on Stabilizing Electrocatalytically Relevant Low-Valent Co(I) Intermediates. J Am Chem Soc 2019; 141:1382-1392. [DOI: 10.1021/jacs.8b12634] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- David P. Hickey
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Christopher Sandford
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Zayn Rhodes
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Tobias Gensch
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Lydia R. Fries
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Shelley D. Minteer
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
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24
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Sen A, Takenaka K, Sasai H. Enantioselective Aza-Wacker-Type Cyclization Promoted by Pd-SPRIX Catalyst. Org Lett 2018; 20:6827-6831. [DOI: 10.1021/acs.orglett.8b02946] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Abhijit Sen
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Kazuhiro Takenaka
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Hiroaki Sasai
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
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25
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Glaisyer EL, Watt MS, Booker-Milburn KI. Pd(II)-Catalyzed [4 + 2] Heterocyclization Sequence for Polyheterocycle Generation. Org Lett 2018; 20:5877-5880. [DOI: 10.1021/acs.orglett.8b02543] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
| | - Michael S. Watt
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
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26
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Kou X, Shao Q, Ye C, Yang G, Zhang W. Asymmetric Aza-Wacker-Type Cyclization of N-Ts Hydrazine-Tethered Tetrasubstituted Olefins: Synthesis of Pyrazolines Bearing One Quaternary or Two Vicinal Stereocenters. J Am Chem Soc 2018; 140:7587-7597. [PMID: 29804449 DOI: 10.1021/jacs.8b02865] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We have developed an asymmetric aza-Wacker-type cyclization of N-Ts hydrazine-tethered tetrasubstituted olefins, affording optically active pyrazolines bearing chiral tetrasubstituted carbon stereocenters. This reaction is tolerant to a broad range of substrates under mild reaction conditions, giving the desired chiral products with high enantioselectivities. Generation of two vicinal stereocenters on the C═C double bonds was also achieved with high selectivities, a process which has been rarely studied for Wacker-type reactions. A mechanistic study revealed that this aza-Wacker-type cyclization undergoes a syn-aminopalladation process. It was also found that for substrates bearing two linear alkyl substituents on the outer carbon atom of the olefin, both of which are larger than a methyl group, the alkyl substituent that is cis to the intranucleophilic group participates more readily in β-hydride elimination. When one of the two alkyl substituents on the outer carbon atom of the olefin is a methyl group, β-hydride elimination proceeds selectively at the methylene side, thus both diastereomers can be prepared via switching the configuration of the olefin. Furthermore, the product can be converted to a pharmaceutical compound in high yields over three steps.
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Affiliation(s)
- Xuezhen Kou
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
| | - Qihang Shao
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
| | - Chenghao Ye
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
| | - Guoqiang Yang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
| | - Wanbin Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
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27
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Qi X, Chen C, Hou C, Fu L, Chen P, Liu G. Enantioselective Pd(II)-Catalyzed Intramolecular Oxidative 6-endo Aminoacetoxylation of Unactivated Alkenes. J Am Chem Soc 2018; 140:7415-7419. [DOI: 10.1021/jacs.8b03767] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaoxu Qi
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Chaohuang Chen
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Chuanqi Hou
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Liang Fu
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Pinhong Chen
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Guosheng Liu
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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28
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Catalytic Aza-Wacker Annulation: Tuning Mechanism by the Activation Mode of Amide and Enantioselective Syntheses of Melinonine-E and Strychnoxanthine. Org Lett 2018; 20:2386-2390. [DOI: 10.1021/acs.orglett.8b00725] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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29
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Yang G, Zhang W. Renaissance of pyridine-oxazolines as chiral ligands for asymmetric catalysis. Chem Soc Rev 2018; 47:1783-1810. [PMID: 29469141 DOI: 10.1039/c7cs00615b] [Citation(s) in RCA: 152] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Oxazoline-containing ligands have been widely employed in numerous asymmetric catalytic reactions. Pyridine-oxazoline-type ligands, a class of hybrid ligands, were designed earlier than bisoxazoline and phosphine-oxazoline ligands; however, their unique properties have only been discovered recently. Pyridine-oxazoline-type chiral ligands are rapidly becoming popular for use in asymmetric catalysis, especially for several new and efficient asymmetric methodologies. Several types of challenging asymmetric reactions have been discovered recently using pyridine-oxazoline-type ligands showing their special properties and potential for future application in a wide range of new catalytic methodologies. This review provides an overview of this field, with the aim of highlighting both ligand design and synthetic methodology development.
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Affiliation(s)
- Guoqiang Yang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
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30
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Wang H, Bai Z, Jiao T, Deng Z, Tong H, He G, Peng Q, Chen G. Palladium-Catalyzed Amide-Directed Enantioselective Hydrocarbofunctionalization of Unactivated Alkenes Using a Chiral Monodentate Oxazoline Ligand. J Am Chem Soc 2018; 140:3542-3546. [DOI: 10.1021/jacs.8b00641] [Citation(s) in RCA: 102] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Hao Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zibo Bai
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Tangqian Jiao
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zhiqiang Deng
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Huarong Tong
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Gang He
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
| | - Qian Peng
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Gong Chen
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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31
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Bao X, Wang Q, Zhu J. Palladium-Catalyzed Enantioselective Desymmetrizing Aza-Wacker Reaction: Development and Application to the Total Synthesis of (−)-Mesembrane and (+)-Crinane. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712521] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Xu Bao
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
| | - Qian Wang
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
| | - Jieping Zhu
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
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32
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Bao X, Wang Q, Zhu J. Palladium-Catalyzed Enantioselective Desymmetrizing Aza-Wacker Reaction: Development and Application to the Total Synthesis of (-)-Mesembrane and (+)-Crinane. Angew Chem Int Ed Engl 2018; 57:1995-1999. [PMID: 29314546 DOI: 10.1002/anie.201712521] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Indexed: 12/23/2022]
Abstract
Reported is an unprecedented catalytic enantioselective desymmetrizing aza-Wacker reaction. In the presence of a catalytic amount of a newly developed Pd(CPA)2 (MeCN)2 catalyst (CPA=chiral phosphoric acid), a pyrox ligand, and molecular oxygen, cyclization of properly functionalized prochiral 3,3-disubstituted cyclohexa-1,4-dienes afforded enantioenriched cis-3a-substituted tetrahydroindoles in good yields with excellent enantioselectivities. A cooperative effect between the phosphoric acid and the pyrox ligand ensured efficient transformation. This reaction was tailor-made for Amaryllidaceae and Sceletium alkaloids as illustrated by its application in the development of the concise and divergent total synthesis of (-)-mesembrane and (+)-crinane.
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Affiliation(s)
- Xu Bao
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH 5304, 1015, Lausanne, Switzerland
| | - Qian Wang
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH 5304, 1015, Lausanne, Switzerland
| | - Jieping Zhu
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH 5304, 1015, Lausanne, Switzerland
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33
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Zhou Y, Shang Z, Li R, Xu X. Mechanistic studies: enantioselective palladium( ii)-catalyzed intramolecular aminoarylation of alkenes by dual N–H and aryl C–H bond cleavage. Org Chem Front 2018. [DOI: 10.1039/c8qo00925b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of PGA and the origin of the enantioselectivity in the palladium(ii)-catalyzed intramolecular aminoarylation of alkenes.
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Affiliation(s)
- Yu Zhou
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- College of Chemistry
- Nankai University
- Tianjin
| | - Zhenfeng Shang
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- College of Chemistry
- Nankai University
- Tianjin
| | - Ruifang Li
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- College of Chemistry
- Nankai University
- Tianjin
| | - Xiufang Xu
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- College of Chemistry
- Nankai University
- Tianjin
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34
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Wang D, Weinstein AB, White PB, Stahl SS. Ligand-Promoted Palladium-Catalyzed Aerobic Oxidation Reactions. Chem Rev 2017; 118:2636-2679. [PMID: 28975795 DOI: 10.1021/acs.chemrev.7b00334] [Citation(s) in RCA: 368] [Impact Index Per Article: 52.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Palladium-catalyzed aerobic oxidation reactions have been the focus of industrial application and extensive research efforts for nearly 60 years. A significant transition occurred in this field approximately 20 years ago, with the introduction of catalysts supported by ancillary ligands. The ligands play crucial roles in the reactions, including promotion of direct oxidation of palladium(0) by O2, bypassing the typical requirement for Cu salts or related redox cocatalysts to facilitate oxidation of the reduced Pd catalyst; facilitation of key bond-breaking and bond-forming steps during substrate oxidation; and modulation of chemo-, regio-, or stereoselectivity of a reaction. The use of ligands has contributed to significant expansion of the scope of accessible aerobic oxidation reactions. Increased understanding of the role of ancillary ligands should promote the development of new synthetic transformations, enable improved control over the reaction selectivity, and improve catalyst activity and stability. This review surveys the different ligands that have been used to support palladium-catalyzed aerobic oxidation reactions and, where possible, describes mechanistic insights into the role played by the ancillary ligand.
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Affiliation(s)
- Dian Wang
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Adam B Weinstein
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Paul B White
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Shannon S Stahl
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
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35
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Aebly AH, Rainey TJ. Pd(II)-catalyzed enantioselective intramolecular oxidative amination utilizing (+)-camphorsulfonic acid. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.07.090] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Race NJ, Hazelden IR, Faulkner A, Bower JF. Recent developments in the use of aza-Heck cyclizations for the synthesis of chiral N-heterocycles. Chem Sci 2017; 8:5248-5260. [PMID: 28959424 PMCID: PMC5606024 DOI: 10.1039/c7sc01480e] [Citation(s) in RCA: 103] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 05/22/2017] [Indexed: 11/21/2022] Open
Abstract
Aza-Heck cyclizations are an emerging method for the construction of chiral N-heterocyclic systems. In these processes, an activated N-O bond replaces the C-X bond (X = halide, OTf) used in conventional Heck reactions, with the associated aza-Pd(ii)-intermediate engaging pendant alkenes in a Heck-like manner. This perspective article commences with an historical overview of the area, which stems from Narasaka's seminal studies using oxime esters as the initiating motif. The scope and mechanism of associated chiral N-heterocyclic methodologies are then outlined, including cascade processes that enable diverse alkene 1,2-carboaminations. The recent emergence of new N-O donors and the realization of highly enantioselective aza-Heck cyclizations are then discussed. Collectively, these studies suggest that the aza-Heck approach can underpin a broad family of redox-neutral and enantioselective C-N bond forming processes.
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Affiliation(s)
- Nicholas J Race
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
| | - Ian R Hazelden
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
| | - Adele Faulkner
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
| | - John F Bower
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
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37
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Guo JY, Minko Y, Santiago CB, Sigman MS. Developing Comprehensive Computational Parameter Sets To Describe the Performance of Pyridine-Oxazoline and Related Ligands. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00739] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Jing-Yao Guo
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Yury Minko
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Celine B. Santiago
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
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38
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Zhang W, Chen P, Liu G. Enantioselective Palladium(II)-Catalyzed Intramolecular Aminoarylation of Alkenes by Dual N−H and Aryl C−H Bond Cleavage. Angew Chem Int Ed Engl 2017; 56:5336-5340. [DOI: 10.1002/anie.201700889] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Indexed: 01/20/2023]
Affiliation(s)
- Wen Zhang
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; University of the Chinese Academy of Sciences; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Pinhong Chen
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; University of the Chinese Academy of Sciences; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
- Key Laboratory of Functional Small Organic Molecules; Ministry of Education; Jiangxi Normal University; 99 Ziyang Road, Nanchang Jiangxi 330022 China
| | - Guosheng Liu
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; University of the Chinese Academy of Sciences; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
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39
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Zhang W, Chen P, Liu G. Enantioselective Palladium(II)-Catalyzed Intramolecular Aminoarylation of Alkenes by Dual N−H and Aryl C−H Bond Cleavage. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700889] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Wen Zhang
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; University of the Chinese Academy of Sciences; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Pinhong Chen
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; University of the Chinese Academy of Sciences; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
- Key Laboratory of Functional Small Organic Molecules; Ministry of Education; Jiangxi Normal University; 99 Ziyang Road, Nanchang Jiangxi 330022 China
| | - Guosheng Liu
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; University of the Chinese Academy of Sciences; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
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40
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Race NJ, Faulkner A, Fumagalli G, Yamauchi T, Scott JS, Rydén-Landergren M, Sparkes HA, Bower JF. Enantioselective Narasaka-Heck cyclizations: synthesis of tetrasubstituted nitrogen-bearing stereocenters. Chem Sci 2017; 8:1981-1985. [PMID: 28451314 PMCID: PMC5390761 DOI: 10.1039/c6sc04466b] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 11/13/2016] [Indexed: 02/06/2023] Open
Abstract
The first examples of highly enantioselective Narasaka-Heck cyclizations are described. A SPINOL-derived P,N-ligand system enables Pd-catalyzed 5-exo cyclization of a range of oxime esters with sterically diverse trisubstituted alkenes to generate dihydropyrroles containing tetrasubstituted nitrogen-bearing stereocenters in 56 to 86% yield and 90 : 10 to 95 : 5 e.r. These processes are rare examples of reactions that proceed via enantioselective migratory insertion of alkenes into Pd-N bonds, and the first where trisubstituted alkenes are used to generate tetrasubstituted stereocenters with high enantioselectivity.
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Affiliation(s)
- Nicholas J Race
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
| | - Adele Faulkner
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
| | | | - Takayuki Yamauchi
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
| | - James S Scott
- AstraZeneca , Alderley Park , Macclesfield , Cheshire SK10 4TG , UK
| | | | - Hazel A Sparkes
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
| | - John F Bower
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK .
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41
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Xiong P, Xu HH, Xu HC. Metal- and Reagent-Free Intramolecular Oxidative Amination of Tri- and Tetrasubstituted Alkenes. J Am Chem Soc 2017; 139:2956-2959. [PMID: 28199102 DOI: 10.1021/jacs.7b01016] [Citation(s) in RCA: 157] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A metal- and reagent-free, electrochemical intramolecular oxidative amination reaction of tri- and tetrasubstituted alkenes has been developed. The electrosynthetic method proceeds through radical cyclization to form the key C-N bond, allowing a variety of hindered tri- and tetrasubstituted olefins to participate in the amination reaction. The result is the efficient synthesis of a host of alkene-bearing cyclic carbamates and ureas and lactams.
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Affiliation(s)
- Peng Xiong
- iChEM, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, and College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, P. R. China
| | - He-Huan Xu
- iChEM, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, and College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, P. R. China
| | - Hai-Chao Xu
- iChEM, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, and College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, P. R. China
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42
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Du W, Gu Q, Li Y, Lin Z, Yang D. Enantioselective Palladium-Catalyzed Oxidative Cascade Cyclization of Aliphatic Alkenyl Amides. Org Lett 2017; 19:316-319. [DOI: 10.1021/acs.orglett.6b03410] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Wei Du
- Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China
| | - Qiangshuai Gu
- Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China
| | - Yang Li
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Zhenyang Lin
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Dan Yang
- Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China
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43
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Yu YF, Shu C, Tan TD, Li L, Rafique S, Ye LW. Synthesis of Enantioenriched Pyrrolidines via Gold-Catalyzed Tandem Cycloisomerization/Hydrogenation of Chiral Homopropargyl Sulfonamides. Org Lett 2016; 18:5178-5181. [DOI: 10.1021/acs.orglett.6b02736] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Yong-Fei Yu
- State Key Laboratory of Physical Chemistry of Solid Surfaces
and Key Laboratory for Chemical Biology of Fujian Province, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Chao Shu
- State Key Laboratory of Physical Chemistry of Solid Surfaces
and Key Laboratory for Chemical Biology of Fujian Province, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Tong-De Tan
- State Key Laboratory of Physical Chemistry of Solid Surfaces
and Key Laboratory for Chemical Biology of Fujian Province, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Long Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces
and Key Laboratory for Chemical Biology of Fujian Province, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Shahid Rafique
- State Key Laboratory of Physical Chemistry of Solid Surfaces
and Key Laboratory for Chemical Biology of Fujian Province, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Long-Wu Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces
and Key Laboratory for Chemical Biology of Fujian Province, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- State Key Laboratory
of Organometallic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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44
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Pérez SJ, Purino MA, Cruz DA, López-Soria JM, Carballo RM, Ramírez MA, Fernández I, Martín VS, Padrón JI. Enantiodivergent Synthesis of (+)- and (−)-Pyrrolidine 197B: Synthesis oftrans-2,5-Disubstituted Pyrrolidines by Intramolecular Hydroamination. Chemistry 2016; 22:15529-15535. [DOI: 10.1002/chem.201602708] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Sixto J. Pérez
- Instituto Universitario de Bio-Orgánica “Antonio González” (CIBICAN); “Síntesis Orgánica Sostenible; Unidad Asociada al CSIC”; Departamento de Química Orgánica; Universidad de La Laguna; C/Francisco Sánchez 2 38206 La Laguna, Tenerife Spain
| | - Martín A. Purino
- Instituto Universitario de Bio-Orgánica “Antonio González” (CIBICAN); “Síntesis Orgánica Sostenible; Unidad Asociada al CSIC”; Departamento de Química Orgánica; Universidad de La Laguna; C/Francisco Sánchez 2 38206 La Laguna, Tenerife Spain
| | - Daniel A. Cruz
- Instituto Universitario de Bio-Orgánica “Antonio González” (CIBICAN); “Síntesis Orgánica Sostenible; Unidad Asociada al CSIC”; Departamento de Química Orgánica; Universidad de La Laguna; C/Francisco Sánchez 2 38206 La Laguna, Tenerife Spain
| | - Juan M. López-Soria
- Instituto Universitario de Bio-Orgánica “Antonio González” (CIBICAN); “Síntesis Orgánica Sostenible; Unidad Asociada al CSIC”; Departamento de Química Orgánica; Universidad de La Laguna; C/Francisco Sánchez 2 38206 La Laguna, Tenerife Spain
- Instituto de Productos Naturales y Agrobiología; Consejo Superior de Investigaciones Científicas (CSIC); C/Francisco Sánchez 3 38206 La Laguna, Tenerife Spain
| | - Rubén M. Carballo
- Laboratorio de Química Farmacéutica; Facultad de Química; Universidad Autónoma de Yucatán, C/41, n°421×26 y 28; 97150 Mérida, Yucatán México
| | - Miguel A. Ramírez
- Instituto Universitario de Bio-Orgánica “Antonio González” (CIBICAN); “Síntesis Orgánica Sostenible; Unidad Asociada al CSIC”; Departamento de Química Orgánica; Universidad de La Laguna; C/Francisco Sánchez 2 38206 La Laguna, Tenerife Spain
| | - Israel Fernández
- Departamento de Química Orgánica I; Facultad de Ciencias Químicas; Universidad Complutense de Madrid; 28040 Madrid Spain
| | - Víctor S. Martín
- Instituto Universitario de Bio-Orgánica “Antonio González” (CIBICAN); “Síntesis Orgánica Sostenible; Unidad Asociada al CSIC”; Departamento de Química Orgánica; Universidad de La Laguna; C/Francisco Sánchez 2 38206 La Laguna, Tenerife Spain
| | - Juan I. Padrón
- Instituto Universitario de Bio-Orgánica “Antonio González” (CIBICAN); “Síntesis Orgánica Sostenible; Unidad Asociada al CSIC”; Departamento de Química Orgánica; Universidad de La Laguna; C/Francisco Sánchez 2 38206 La Laguna, Tenerife Spain
- Instituto de Productos Naturales y Agrobiología; Consejo Superior de Investigaciones Científicas (CSIC); C/Francisco Sánchez 3 38206 La Laguna, Tenerife Spain
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45
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Xu L, Zhang X, McCammant MS, Sigman MS, Wu YD, Wiest O. Mechanism and Selectivity in the Pd-Catalyzed Difunctionalization of Isoprene. J Org Chem 2016; 81:7604-7611. [PMID: 27486829 DOI: 10.1021/acs.joc.6b01317] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The three-component coupling of isoprene, an alkenyl triflate, and styrenylboronic acid catalyzed by a palladium pyrox complex affords access to skipped dienes from simple chemical feedstocks. Unfortunately, the transformation proceeds with only moderate selectivity and yields. The reaction mechanism and factors responsible for the resulting regioselectivity were elucidated using M06/SDD/6-311++G(d,p) + SMD calculations. Distortion of the palladium coordination sphere in the transition structure of the migratory insertion step is found to control the 4,1- vs 1,x-selectivity. The calculated ΔΔG⧧ of 1.0 kcal/mol for this step is in excellent agreement with the experimentally observed selectivity of 1:9.9 disfavoring the 4,1-product. The transmetalation was found to be the regioselectivity determining step for the formation of the 1,2- vs 1,4-addition products. Systematic conformational searches for the transmetalation transition structure revealed a series of steric interactions between the t-Bu substituent on the ligand and the substrates in the model system that are balanced by additional repulsive interactions between the substrates and the pyridyl portion of the ligand. The combination of these effects leads to the low to moderate 1,2- vs 1,4-selectivity in the experimentally studied system.
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Affiliation(s)
- Liping Xu
- Laboratory of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen 518055, People's Republic of China.,School of Chemical Engineering, Shandong University of Technology , Zibo 255049, People's Republic of China
| | - Xin Zhang
- Laboratory of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen 518055, People's Republic of China
| | - Matthew S McCammant
- Department of Chemistry, University of Utah , 315 S. 1400 East, Salt Lake City, Utah 84112, United States
| | - Matthew S Sigman
- Department of Chemistry, University of Utah , 315 S. 1400 East, Salt Lake City, Utah 84112, United States
| | - Yun-Dong Wu
- Laboratory of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen 518055, People's Republic of China.,College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, People's Republic of China
| | - Olaf Wiest
- Department of Chemistry and Biochemistry, University of Notre Dame , Notre Dame, Indiana 46556-5670, United States
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46
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Hazelden IR, Ma X, Langer T, Bower JF. DiverseN-Heterocyclic Ring Systems via Aza-Heck Cyclizations ofN-(Pentafluorobenzoyloxy)sulfonamides. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605152] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ian R. Hazelden
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
| | - Xiaofeng Ma
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
| | - Thomas Langer
- Pharmaceutical Technology & Development, AstraZeneca; Charter Way Macclesfield SK10 2NA UK
| | - John F. Bower
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
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47
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Hazelden IR, Ma X, Langer T, Bower JF. Diverse N-Heterocyclic Ring Systems via Aza-Heck Cyclizations of N-(Pentafluorobenzoyloxy)sulfonamides. Angew Chem Int Ed Engl 2016; 55:11198-11202. [PMID: 27460965 PMCID: PMC5010782 DOI: 10.1002/anie.201605152] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Indexed: 12/11/2022]
Abstract
Aza‐Heck cyclizations initiated by oxidative addition of Pd0‐catalysts into the N−O bond of N‐(pentafluoro‐benzoyloxy)sulfonamides are described. These studies, which encompass only the second class of aza‐Heck reaction developed to date, provide direct access to diverse N‐heterocyclic ring systems.
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Affiliation(s)
- Ian R Hazelden
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom
| | - Xiaofeng Ma
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom
| | - Thomas Langer
- Pharmaceutical Technology & Development, AstraZeneca, Charter Way, Macclesfield, SK10 2NA, United Kingdom
| | - John F Bower
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom
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48
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White PB, Jaworski JN, Zhu GH, Stahl SS. Diazafluorenone-Promoted Oxidation Catalysis: Insights into the Role of Bidentate Ligands in Pd-Catalyzed Aerobic Aza-Wacker Reactions. ACS Catal 2016; 6:3340-3348. [PMID: 27175308 DOI: 10.1021/acscatal.6b00953] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
2,2'-Bipyridine (bpy), 1,10-phenanthroline (phen) and related bidentate ligands often inhibit homogeneous Pd-catalyzed aerobic oxidation reactions; however, certain derivatives, such as 4,5-diazafluoren-9-one (DAF), can promote catalysis. In order to gain insight into this divergent ligand behavior, eight different bpy- and phen-derived chelating ligands have been evaluated in Pd(OAc)2-catalyzed oxidative cyclization of (E)-4-hexenyltosylamide. Two of the ligands, DAF and 6,6'-dimethyl-2,2'-bipyridine (6,6'-Me2bpy), support efficient catalytic turnover, while the others strongly inhibit the reaction. DAF is especially effective and is the only ligand that exhibits "ligand-accelerated catalysis". Evidence suggests that the utility of DAF and 6,6'-Me2bpy originates from the ability of these ligands to access κ1-coordination modes via dissociation of one of the pyridyl rings. This hemilabile character is directly observed by NMR spectroscopy upon adding one equivalent of pyridine to solutions of 1:1 L/Pd(OAc)2 (L = DAF and 6,6'-Me2bpy), and is further supported by an X-ray crystal structure of Pd(py)(κ1-DAF)OAc2. DFT computational studies illuminate the influence of three different chelating ligands [DAF, 6,6'-Me2bpy, and 2,9-dimethyl-1,10-phenanthroline (2,9-Me2phen)] on the energetics of the aza-Wacker reaction pathway. The results show that DAF and 6,6'-Me2bpy destabilize the corresponding ground-state Pd(N~N)(OAc)2 complexes, while stabilizing the rate-limiting transition state for alkene insertion into a Pd-N bond. Interconversion between κ2- and κ1-coordination modes facilitate access to open coordination sites at the PdII center. The insights from these studies introduce new ligand concepts that could promote numerous other classes of Pd-catalyzed aerobic oxidation reaction.
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Affiliation(s)
- Paul B. White
- Department
of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Jonathan N. Jaworski
- Department
of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Geyunjian Harry Zhu
- Department
of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Shannon S. Stahl
- Department
of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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49
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Hamasaki T, Kakiuchi F, Kochi T. Chain-walking Cycloisomerization of 1,n-Dienes Catalyzed by Pyridine–Oxazoline Palladium Catalysts and Its Application to Asymmetric Synthesis. CHEM LETT 2016. [DOI: 10.1246/cl.151138] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Taro Hamasaki
- Department of Chemistry, Faculty of Science and Technology, Keio University
| | - Fumitoshi Kakiuchi
- Department of Chemistry, Faculty of Science and Technology, Keio University
| | - Takuya Kochi
- Department of Chemistry, Faculty of Science and Technology, Keio University
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50
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Xiong P, Xu F, Qian XY, Yohannes Y, Song J, Lu X, Xu HC. Copper-Catalyzed Intramolecular Oxidative Amination of Unactivated Internal Alkenes. Chemistry 2016; 22:4379-83. [PMID: 26878987 DOI: 10.1002/chem.201600329] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Indexed: 12/30/2022]
Abstract
A copper-catalyzed oxidative amination of unactivated internal alkenes has been developed. The Wacker-type oxidative alkene amination reaction is traditionally catalyzed by a palladium through a mechanism involving aminopalladation and β-hydride elimination. Replacing the precious and scarce palladium with a cheap and abundant copper for this transformation has been challenging because of the difficulty associated with the aminocupration of internal alkenes. The combination of a simple copper salt, without additional ligand, as the catalyst and Dess-Martin periodinane as the oxidant, promotes efficiently the oxidative amination of allylic carbamates and ureas bearing di- and trisubstituted alkenes leading to oxazolidinones and imidazolidinones. Preliminary mechanistic studies suggested a hybrid radical-organometallic mechanism involving an amidyl radical cyclization to form the key C-N bond.
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Affiliation(s)
- Peng Xiong
- Collaborative Innovation Center of Chemistry for Energy Material, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Xiamen University, Xiamen, 361005, P. R. China
| | - Fan Xu
- Collaborative Innovation Center of Chemistry for Energy Material, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Xiamen University, Xiamen, 361005, P. R. China
| | - Xiang-Yang Qian
- Collaborative Innovation Center of Chemistry for Energy Material, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Xiamen University, Xiamen, 361005, P. R. China
| | - Yared Yohannes
- Collaborative Innovation Center of Chemistry for Energy Material, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Xiamen University, Xiamen, 361005, P. R. China
| | - Jinshuai Song
- Fujian Institute of Research on Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China
| | - Xin Lu
- Collaborative Innovation Center of Chemistry for Energy Material, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Xiamen University, Xiamen, 361005, P. R. China.
| | - Hai-Chao Xu
- Collaborative Innovation Center of Chemistry for Energy Material, State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Xiamen University, Xiamen, 361005, P. R. China.
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