1
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Yahata K, Fürstner A. Total Synthesis of the Guangnanmycin A Alcohol. Angew Chem Int Ed Engl 2024; 63:e202319070. [PMID: 38226793 DOI: 10.1002/anie.202319070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/14/2024] [Accepted: 01/16/2024] [Indexed: 01/17/2024]
Abstract
Guangnanmycin A is a recently discovered congener of the well-known antitumor drug lead leinamycin; its macrolactam ring, however, is even more strained than that of the parent compound. The first synthetic foray towards this challenging target is reported, which relies on molybdenum-catalyzed macrocyclization by ring closing alkyne metathesis (RCAM) followed by ruthenium-catalyzed redox isomerization of the propargyl alcohol thus formed; the resulting enone enabled the introduction of the yet missing exo-methylene group by a modified Peterson olefination. The signature disulfide moiety of guangnanmycin A was installed by strain-driven thia-Michael addition followed by conversion of the thioether thus formed into an unsymmetric disulfide with the aid of (methylthio)dimethylsulfonium tetrafluoroborate and MeSSMe. While this sequence furnished racemic guangnanmycin A alcohol in good overall yield, the final oxidation to the corresponding acid failed, most likely because of the exceptional sensitivity of the strained scaffold.
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Affiliation(s)
- Kenzo Yahata
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim/Ruhr, Germany
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2
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An unexpected reaction of indole derivatives and EAA catalyzed with InCl3. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2023.113065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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3
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Roy D, Tharra P, Baire B. An Approach for the Generation of γ-Propenylidene-γ-butenolides and Application to the Total Synthesis of Rubrolides. Org Lett 2021; 23:5605-5610. [PMID: 34259007 DOI: 10.1021/acs.orglett.1c01529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Design and synthesis of a new class of γ-butenolides, viz. β-aryl-γ-propenylidene-γ-butenolides, have been reported from β-aryl-Z-enoate propargylic alcohols in the presence of acid. Isolation of β-aryl-γ-propenylidene-γ-butenolides and their O18-isomer confirmed the intermediacy of the allenyl-lactonium ion as well as the cyclic-hemiacetal during the proposed mechanism. By utilizing the β-aryl-γ-methylenecyclohexenylidene-γ-butenolides as starting materials, a highly stereoselective and efficient approach has been developed for the syntheses of frameworks of rubrolide natural products. This strategy was further extended for the total synthesis of rubrolide E.
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Affiliation(s)
- Debayan Roy
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamilnadu, India
| | - Prabhakararao Tharra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamilnadu, India
| | - Beeraiah Baire
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamilnadu, India
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4
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Hu X, Tan Z, Xiong L, Yang C, Jiang H, Zeng W. Rh(III)-Catalyzed Csp 2-Csp 3 σ-Bond Enolation of α-Indolyl Alcohols. Org Lett 2021; 23:3965-3969. [PMID: 33955759 DOI: 10.1021/acs.orglett.1c01132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A Rh(III)-catalyzed Csp2-Csp3 σ-bond carbenoid functionalization of α-(2-indolyl)alcohols with acceptor/acceptor diazo compounds has been developed. This transformation provides an efficient strategy to assemble stable C2-enolated indole skeletons via Csp2-Csp3 σ-bond cleavage.
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Affiliation(s)
- Xinwei Hu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Zheng Tan
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Li Xiong
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Can Yang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Wei Zeng
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
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5
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Boyko YD, Huck CJ, Ning S, Shved AS, Yang C, Chu T, Tonogai EJ, Hergenrother PJ, Sarlah D. Synthetic Studies on Selective, Proapoptotic Isomalabaricane Triterpenoids Aided by Computational Techniques. J Am Chem Soc 2021; 143:2138-2155. [DOI: 10.1021/jacs.0c12569] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yaroslav D. Boyko
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
- Cancer Center at Illinois, University of Illinois, Urbana, Illinois 61801, United States
| | - Christopher J. Huck
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
- Cancer Center at Illinois, University of Illinois, Urbana, Illinois 61801, United States
| | - Shang Ning
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Alexander S. Shved
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
- Cancer Center at Illinois, University of Illinois, Urbana, Illinois 61801, United States
| | - Cheng Yang
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Tiffany Chu
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Emily J. Tonogai
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
- Cancer Center at Illinois, University of Illinois, Urbana, Illinois 61801, United States
- Carl R. Woese Institute for Genomic Biology, University of Illinois, Urbana, Illinois 61801, United States
| | - Paul J. Hergenrother
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
- Cancer Center at Illinois, University of Illinois, Urbana, Illinois 61801, United States
- Carl R. Woese Institute for Genomic Biology, University of Illinois, Urbana, Illinois 61801, United States
| | - David Sarlah
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
- Cancer Center at Illinois, University of Illinois, Urbana, Illinois 61801, United States
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6
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Regioselective synthesis of spirobarbiturate-dihydrofurans and dihydrofuro[2,3-d]pyrimidines via one-pot cascade reaction of barbiturate-based olefins and ethyl acetoacetate. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7
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Ashida Y, Tanabe Y. Stereocomplementary and Parallel Syntheses of Multi-Substituted (E)-, (Z)-Stereodefined α,β-Unsaturated Esters: Application to Drug Syntheses. CHEM REC 2020; 20:1410-1429. [PMID: 32931154 DOI: 10.1002/tcr.202000076] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/17/2020] [Accepted: 08/17/2020] [Indexed: 12/20/2022]
Abstract
Ubiquitous α,β-unsaturated esters are well recognized as key structural olefin scaffolds in organic chemistry. (E)- and (Z)-steroselectivity is the most critical issue in their synthesis, however, (E)- and (Z)- stereocomplementary synthetic methods remain quite limited. The present account discloses general (E)-, (Z)-stereocomplementary syntheses of a variety of α,β-unsaturated esters from highly accessible (E)-, (Z)-stereodefined enol tosylates derived from β-ketoesters and α-formyl esters. Step 1 toward the stereocomplementary preparation of (E)-, (Z)-stereodefined enol tosylates is implemented by using inexpensive reagents under mild reaction conditions. Step 2 toward the highly stereoretentive synthesis of (E)- and (Z)-stereodefined α,β-unsaturated esters involves Suzuki-Miyaura, Negishi, Sonogashira, Iron-catalyzed, Mizoroki-Heck, and Buchwald-Hartwig cross-coupling reactions. Notably, this strategy was successfully applied for parallel drug syntheses of (E)- and (Z)-zimelidine, (E)- and (Z)-tamoxifen, and Merck's cyclopropane pharmacophore. Representative successful utilizations by other groups are also introduced.
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Affiliation(s)
- Yuichiro Ashida
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda Hyogo, 669-1337, Japan
| | - Yoo Tanabe
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda Hyogo, 669-1337, Japan
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8
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Ashida Y, Nakata K, Yoshitake D, Sato Y, Miyazaki Y, Tanabe Y. (
E
)‐,(
Z
)‐Stereodefined α‐Chloro‐β‐tosyloxy‐α,β‐unsaturated Esters: Sequential Cross‐Couplings for (
E
)‐,(
Z
)‐Stereo Complementary Synthesis of Fully‐Substituted α,β‐Unsaturated Esters. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yuichiro Ashida
- Department of Chemistry School of Science and TechnologyKwansei Gakuin University 2-1 Gakuen, Sanda Hyogo 669-1337 Japan
| | - Kohei Nakata
- Department of Chemistry School of Science and TechnologyKwansei Gakuin University 2-1 Gakuen, Sanda Hyogo 669-1337 Japan
| | - Daisuke Yoshitake
- Department of Chemistry School of Science and TechnologyKwansei Gakuin University 2-1 Gakuen, Sanda Hyogo 669-1337 Japan
| | - Yuka Sato
- Department of Chemistry School of Science and TechnologyKwansei Gakuin University 2-1 Gakuen, Sanda Hyogo 669-1337 Japan
| | - Yukie Miyazaki
- Department of Chemistry School of Science and TechnologyKwansei Gakuin University 2-1 Gakuen, Sanda Hyogo 669-1337 Japan
| | - Yoo Tanabe
- Department of Chemistry School of Science and TechnologyKwansei Gakuin University 2-1 Gakuen, Sanda Hyogo 669-1337 Japan
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9
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Duan XF. Iron catalyzed stereoselective alkene synthesis: a sustainable pathway. Chem Commun (Camb) 2020; 56:14937-14961. [DOI: 10.1039/d0cc04882h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Replacing expensive or toxic transition metals with iron has become an important trend. This article summarises the recent progresses of a wide range of Fe-catalyzed reactions for accessing various stereodefined alkenes.
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10
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Yan X, Shao P, Song X, Zhang C, Lu C, Liu S, Li Y. Chemoselective syntheses of spirodihydrofuryl and spirocyclopropyl barbiturates via cascade reactions of barbiturate-based olefins and acetylacetone. Org Biomol Chem 2019; 17:2684-2690. [PMID: 30768085 DOI: 10.1039/c9ob00004f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Michael addition initiated ring closure reaction of barbiturate-based olefins and acetylacetone with NBS has been explored. The efficient and chemoselective approach for the synthesis of barbiturate-fused spirocycles was established. Spirodihydrofuryl barbiturates and spirocyclopropyl barbiturates were synthesized selectively via cascade reactions under different basic conditions in moderate to excellent yields. The structure of 2-(4-chlorophenyl)-1,1-diacetyl-5,7-dimethyl-5,7-diazaspiro[2,5]octane-4,6,8-trione was confirmed by single crystal X-ray diffraction analysis.
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Affiliation(s)
- Xuebin Yan
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China.
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11
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Hofmayer MS, Lutter FH, Grokenberger L, Hammann JM, Knochel P. Practical Ni-Catalyzed Cross-Coupling of Unsaturated Zinc Pivalates with Unsaturated Nonaflates and Triflates. Org Lett 2018; 21:36-39. [PMID: 30561216 DOI: 10.1021/acs.orglett.8b03417] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A practical nickel-catalyzed cross-coupling of (hetero)aryl or alkynylzinc pivalates with various unsaturated nonaflates or triflates is described. Organozinc pivalates allow these cross-couplings to take place with high yields and a low catalyst loading (0.5 mol %). Couplings with ( E)- and ( Z)-alkenyl triflates proceed with retention of configuration.
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Affiliation(s)
- Maximilian S Hofmayer
- Department of Chemistry , Ludwig-Maximilians-Universität , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Ferdinand H Lutter
- Department of Chemistry , Ludwig-Maximilians-Universität , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Lucie Grokenberger
- Department of Chemistry , Ludwig-Maximilians-Universität , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Jeffrey M Hammann
- Department of Chemistry , Ludwig-Maximilians-Universität , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Paul Knochel
- Department of Chemistry , Ludwig-Maximilians-Universität , Butenandtstrasse 5-13 , 81377 München , Germany
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12
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Patel HH, Prater MB, Squire SO, Sigman MS. Formation of Chiral Allylic Ethers via an Enantioselective Palladium-Catalyzed Alkenylation of Acyclic Enol Ethers. J Am Chem Soc 2018; 140:5895-5898. [PMID: 29665329 PMCID: PMC5968819 DOI: 10.1021/jacs.8b02751] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This report details a palladium-catalyzed process to access highly functionalized, optically active allylic aryl ethers. A number of electron-deficient alkenyl triflates underwent enantioselective and site-selective coupling with acyclic aryl enol ethers in the presence of a chiral palladium catalyst. This transform provides chiral allylic ether products in high yields and excellent enantiomeric ratios, furnishing a unique disconnection to incorporate heteroatoms at a stereocenter. Finally, the applicability of the products to target synthesis was demonstrated through the formation of a chiral allylic alcohol and the generation of a flavone-inspired product.
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Affiliation(s)
- Harshkumar H. Patel
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Matthew B. Prater
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Scott O. Squire
- 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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13
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Studies toward brevisulcenal F via convergent strategies for marine ladder polyether synthesis. Tetrahedron 2018; 74:1111-1122. [PMID: 29479119 DOI: 10.1016/j.tet.2018.01.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Shortly after the initial isolation of marine ladder polyether natural products, biomimetic epoxide-opening cascade reactions were proposed as an efficient strategy for the synthesis of these compounds. However, difficulties in assembling the cascade precursors have limited the realization of these cascades. In this report, we describe strategies that provide convergent access to cascade precursors via regioselective allylation and efficient fragment coupling. We then investigate epoxide-opening cascades promoted by strong bases for the formation of fused tetrahydropyrans. These strategies are evaluated in the context of the synthesis of rings CDEFG of brevisulcenal F.
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14
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Hatakeyama S. Stereocontrolled Total Synthesis of Biologically Active Natural Products. YAKUGAKU ZASSHI 2018; 138:191-209. [DOI: 10.1248/yakushi.17-00187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Bisz E, Szostak M. Iron-Catalyzed C-O Bond Activation: Opportunity for Sustainable Catalysis. CHEMSUSCHEM 2017; 10:3964-3981. [PMID: 28840648 DOI: 10.1002/cssc.201701287] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Indexed: 06/07/2023]
Abstract
Oxygen-based electrophiles have emerged as some of the most valuable cross-coupling partners in organic synthesis due to several major strategic and environmental benefits, such as abundance and potential to avoid toxic halide waste. In this context, iron-catalyzed C-O activation/cross-coupling holds particular promise to achieve sustainable catalytic protocols due to its natural abundance, inherent low toxicity, and excellent economic and ecological profile. Recently, tremendous progress has been achieved in the development of new methods for functional-group-tolerant iron-catalyzed cross-coupling reactions by selective C-O cleavage. These methods establish highly attractive alternatives to traditional cross-coupling reactions by using halides as electrophilic partners. In particular, new easily accessible oxygen-based electrophiles have emerged as substrates in iron-catalyzed cross-coupling reactions, which significantly broaden the scope of this catalysis platform. New mechanistic manifolds involving iron catalysis have been established; thus opening up vistas for the development of a wide range of unprecedented reactions. The synthetic potential of this sustainable mode of reactivity has been highlighted by the development of new strategies in the construction of complex motifs, including in target synthesis. The most recent advances in sustainable iron-catalyzed cross-coupling of C-O-based electrophiles are reviewed, with a focus on both mechanistic aspects and synthetic utility. It should be noted that this catalytic manifold provides access to motifs that are often not easily available by other methods, such as the assembly of stereodefined dienes or C(sp2 )-C(sp3 ) cross-couplings, thus emphasizing the synthetic importance of this mode of reactivity.
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Affiliation(s)
- Elwira Bisz
- Department of Chemistry, Opole University, 48 Oleska Street, 45-052, Opole, Poland
| | - Michal Szostak
- Department of Chemistry, Opole University, 48 Oleska Street, 45-052, Opole, Poland
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ, 07102, USA
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16
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Kutsumura N, Shibuya K, Yamaguchi H, Saito T. n-Butyllithium-promoted regioselective elimination of vicinal bis-triflate having an adjacent ether oxygen. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.09.036] [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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17
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Magata T, Nagano S, Endo T, Kawaida J, Nagaoka S, Hirokawa Y, Maezaki N. Enantioselective synthesis of methyl 2-[1-[( tert -butoxycarbonyl)amino]ethyl]-4-methyloxazole-5-carboxylate by a one–pot enamide cyclization. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Yu S, Li F, Kim S. (E)- and (Z)-Stereodefined Enol Sulfate Esters Derived from α-Aryl Aldehydes: Stereocomplementary Synthesis of Styryl Sulfate Natural Products. J Org Chem 2017. [DOI: 10.1021/acs.joc.7b00868] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shuai Yu
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Feng Li
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
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19
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Moodie LWK, Chammaa S, Kindahl T, Hedberg C. Palladium-Mediated Approach to Coumarin-Functionalized Amino Acids. Org Lett 2017; 19:2797-2800. [DOI: 10.1021/acs.orglett.7b00854] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Samy Chammaa
- Department
of Chemical Biology, Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany
| | - Tomas Kindahl
- Umeå University, Department of Chemistry, 90187 Umeå, Sweden
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20
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Li H, Fiorito D, Mazet C. Exploring Site Selectivity of Iridium Hydride Insertion into Allylic Alcohols: Serendipitous Discovery and Comparative Study of Organic and Organometallic Catalysts for the Vinylogous Peterson Elimination. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03376] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Houhua Li
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Daniele Fiorito
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
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21
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Tharra P, Baire B. Unconventional Reactivity of (Z
)-Enoate Propargylic Alcohols in the Presence of Acids. Chemistry 2017; 23:2014-2017. [DOI: 10.1002/chem.201605654] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Prabhakararao Tharra
- Department of Chemistry; Indian Institute of Technology Madras, Chennai; Tamilnadu 600036 India
| | - Beeraiah Baire
- Department of Chemistry; Indian Institute of Technology Madras, Chennai; Tamilnadu 600036 India
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22
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Rodrigues CAB, Misale A, Schiel F, Maulide N. Direct synthesis of γ-pyrones by electrophilic condensation of β-ketoesters. Org Biomol Chem 2017; 15:680-683. [DOI: 10.1039/c6ob01884j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Condensation of β-ketoesters into γ-pyrones mediated by triflic anhydride is presented. Mechanistic studies were performed to rationalize this transformation.
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Affiliation(s)
- Catarina A. B. Rodrigues
- University of Vienna
- Institute of Organic Chemistry
- 1090 Vienna
- Austria
- Instituto de Investigação do Medicamento (iMed.ULisboa)
| | - Antonio Misale
- University of Vienna
- Institute of Organic Chemistry
- 1090 Vienna
- Austria
| | - Florian Schiel
- University of Vienna
- Institute of Organic Chemistry
- 1090 Vienna
- Austria
| | - Nuno Maulide
- University of Vienna
- Institute of Organic Chemistry
- 1090 Vienna
- Austria
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23
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Su X, Huang H, Yuan Y, Li Y. Radical Desulfur‐Fragmentation and Reconstruction of Enol Triflates: Facile Access to α‐Trifluoromethyl Ketones. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608507] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xiaolong Su
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Honggui Huang
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Yaofeng Yuan
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Yi Li
- Department of Chemistry Fuzhou University Fuzhou 350116 China
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24
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Su X, Huang H, Yuan Y, Li Y. Radical Desulfur‐Fragmentation and Reconstruction of Enol Triflates: Facile Access to α‐Trifluoromethyl Ketones. Angew Chem Int Ed Engl 2016; 56:1338-1341. [DOI: 10.1002/anie.201608507] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Indexed: 12/23/2022]
Affiliation(s)
- Xiaolong Su
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Honggui Huang
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Yaofeng Yuan
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Yi Li
- Department of Chemistry Fuzhou University Fuzhou 350116 China
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25
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Munteanu C, Frantz DE. Palladium-Catalyzed Synthesis of Alkynes via a Tandem Decarboxylation/Elimination of (E)-Enol Triflates. Org Lett 2016; 18:3937-9. [PMID: 27456435 DOI: 10.1021/acs.orglett.6b01904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A mild catalytic synthesis of alkynes via a tandem Pd-catalyzed decarboxylation/elimination of enol triflates is described. Key attributes of the method include readily available starting materials, broad functional group tolerance, and the ability to access terminal, internal, and halogenated alkynes. The preliminary scope of the reaction is demonstrated on 25 different examples with yields ranging from 63% to 96%.
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Affiliation(s)
- Charissa Munteanu
- Department of Chemistry, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
| | - Doug E Frantz
- Department of Chemistry, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
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26
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Abstract
This Account presents the development of the iridium-catalyzed isomerization of primary allylic alcohols in our laboratory over the past 8 years. Our initial interest was driven by the long-standing challenge associated with the development of a general catalyst even for the nonasymmetric version of this seemingly simple chemical transformation. The added value of the aldehyde products and the possibility to rapidly generate molecular complexity from readily accessible allylic alcohols upon a redox-economical isomerization reaction were additional sources of motivation. Certainly influenced by the success story of the related isomerization of allylic amines, most catalysts developed for the selective isomerization of allylic alcohols were focused on rhodium as a transition metal of choice. Our approach has been based on the commonly accepted precept that hydrogenation and isomerization are often competing processes, with the latter being usually suppressed in favor of the former. The cationic iridium complexes [(Cy3P)(pyridine)Ir(cod)]X developed by Crabtree (X = PF6) and Pfaltz (X = BArF) are usually considered as the most versatile catalysts for the hydrogenation of allylic alcohols. Using molecular hydrogen to generate controlled amounts of the active form of these complexes but performing the reaction in the absence of molecular hydrogen enabled deviation from the typical hydrogenation manifold and favored exclusively the isomerization of allylic alcohols into aldehydes. Isotopic labeling and crossover experiments revealed the intermolecular nature of the process. Systematic variation of the ligand on the iridium center allowed us to identify the structural features beneficial for catalytic activity. Subsequently, three generations of chiral catalysts have been investigated and enabled us to reach excellent levels of enantioselectivity for a wide range of 3,3-disubstituted aryl/alkyl and alkyl/alkyl primary allylic alcohols leading to β-chiral aldehydes. The combination of the isomerization reaction with enamine catalysis in a sequential process gave access to α,β-chiral aldehydes in high diastereomeric ratio and excellent enantioselectivity. Catalyst-controlled diastereoselective isomerization of stereochemically complex steroid scaffolds has been achieved, giving access indifferently to derivatives with the natural and unnatural C20 configuration, a long-standing challenge in the field. Structural diversification at close proximity of the reactive site and within the polycyclic domain served to further demonstrate the generality and the potential of the method. Models based on quadrant diagrams enabled rationalization of the high levels of enantio- and diastereocontrol obtained in the isomerization of allylic alcohols.
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Affiliation(s)
- Houhua Li
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
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27
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Rivera ACP, Still R, Frantz DE. Iron-Catalyzed Stereoselective Cross-Coupling Reactions of Stereodefined Enol Carbamates with Grignard Reagents. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601899] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Raymond Still
- Department of Chemistry; The University of Texas at San Antonio; San Antonio TX 78249 USA
| | - Doug E. Frantz
- Department of Chemistry; The University of Texas at San Antonio; San Antonio TX 78249 USA
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28
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Rivera ACP, Still R, Frantz DE. Iron-Catalyzed Stereoselective Cross-Coupling Reactions of Stereodefined Enol Carbamates with Grignard Reagents. Angew Chem Int Ed Engl 2016; 55:6689-93. [DOI: 10.1002/anie.201601899] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Indexed: 11/05/2022]
Affiliation(s)
| | - Raymond Still
- Department of Chemistry; The University of Texas at San Antonio; San Antonio TX 78249 USA
| | - Doug E. Frantz
- Department of Chemistry; The University of Texas at San Antonio; San Antonio TX 78249 USA
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29
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Picado A, Li S, Dieter RK. A Serendipitous Synthesis of Bis-Heterocyclic Spiro 3(2H)-Furanones. J Org Chem 2016; 81:1391-400. [PMID: 26756271 DOI: 10.1021/acs.joc.5b02350] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
(Z) Enol triflates 6, 11b-d, (E) enol triflate 11e, and phenol triflate 11a, derived from β-keto esters or 2-carboalkoxy phenols, respectively, react with N-Boc 2-lithiopyrrolidine (5a), N-Boc N-methylaminomethyllithium (5b), or 2-lithio-1,3-dithiane (14) to afford 3(2H)-furanones in modest to good yields (38-81%). Product and carbanion reagent studies suggest that the 3(2H)-furanone is formed in a cascade of reactions involving nucleophilic acyl substitution, enolate formation, trifluoromethyl transfer, iminium or sulfenium ion formation, and subsequent ring closure to form the 3(2H)-furanone. The use of 2-lithio-1,3-dithiane affords a cyclic α-keto-S,S,O-orthoester in which the functionality can be selectively manipulated for synthetic applications.
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Affiliation(s)
- Alfredo Picado
- Hunter Laboratory, Department of Chemistry, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - ShengJian Li
- Hunter Laboratory, Department of Chemistry, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - R Karl Dieter
- Hunter Laboratory, Department of Chemistry, Clemson University , Clemson, South Carolina 29634-0973, United States
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30
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Li H, Mazet C. Catalyst-Directed Diastereoselective Isomerization of Allylic Alcohols for the Stereoselective Construction of C(20) in Steroid Side Chains: Scope and Topological Diversification. J Am Chem Soc 2015; 137:10720-7. [DOI: 10.1021/jacs.5b06281] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Houhua Li
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest
Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest
Ansermet, 1211 Geneva, Switzerland
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31
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Williams DR, Gladen PT, Pinchman JR. Total Synthesis of Neodolastane Diterpenes Trichoaurantianolides C and D. J Org Chem 2015; 80:5474-93. [DOI: 10.1021/acs.joc.5b00355] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David R. Williams
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Paul T. Gladen
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Joseph R. Pinchman
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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32
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Kurosawa F, Nakano T, Soeta T, Endo K, Ukaji Y. (Z)-Selective Enol Triflation of α-Alkoxyacetoaldehydes: Application to Synthesis of (Z)-Allylic Alcohols via Cross-Coupling Reaction and [1,2]-Wittig Rearrangement. J Org Chem 2015; 80:5696-703. [PMID: 25970239 DOI: 10.1021/acs.joc.5b00647] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereoselective transformation of α-alkoxyacetoaldehydes to the corresponding (Z)-vinyl triflates was achieved by treatment with phenyl triflimide and DBU. The stereochemistry was explained by the "syn-effect," which was attributed primarily to an σ → π* interaction. The β-alkoxy vinyl triflates obtained were applied to the stereoselective synthesis of structurally diverse (Z)-allylic alcohols via transition metal-catalyzed cross-coupling reaction and [1,2]-Wittig rearrangement.
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Affiliation(s)
- Fumiya Kurosawa
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takeo Nakano
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takahiro Soeta
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Kohei Endo
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Yutaka Ukaji
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
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33
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Patel HH, Sigman MS. Palladium-catalyzed enantioselective Heck alkenylation of acyclic alkenols using a redox-relay strategy. J Am Chem Soc 2015; 137:3462-5. [PMID: 25738548 PMCID: PMC4785804 DOI: 10.1021/ja5130836] [Citation(s) in RCA: 119] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
We report a highly enantioselective intermolecular Heck reaction of alkenyl triflates and acyclic primary or racemic secondary alkenols. The mild reaction conditions permit installation of a wide range of alkenyl groups at positions β, γ, or δ to a carbonyl group in high enantioselectivity. The success of this reaction is attributed to the use of electron-withdrawing alkenyl triflates, which offer selective β-hydride elimination followed by migration of the catalyst through the alkyl chain to give the alkenylated carbonyl products. The synthetic utility of the process is demonstrated by a two-step modification of a reaction product to yield a tricyclic core structure, present in various natural products.
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Affiliation(s)
- Harshkumar H. Patel
- 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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34
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Saini V, O'Dair M, Sigman MS. Synthesis of highly functionalized tri- and tetrasubstituted alkenes via Pd-catalyzed 1,2-hydrovinylation of terminal 1,3-dienes. J Am Chem Soc 2015; 137:608-11. [PMID: 25555197 PMCID: PMC4308737 DOI: 10.1021/ja511640g] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
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An
efficient method for the construction of Csp2–Csp3 bond in a regio- and stereoselective fashion involving 1,3-terminal
dienes, enol triflates/nonaflates, and sodium formate under Pd(0)-catalysis
is described. The three component assembly allows trapping of a π-allyl
intermediate, after the initial migratory insertion of the diene,
by a hydride source that leads to structurally complex and synthetically
challenging tri- and tetrasubstituted alkene building blocks.
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Affiliation(s)
- Vaneet Saini
- Department of Chemistry, University of Utah , 315 South 1400 East, Salt Lake City, Utah 84112-0085, United States
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35
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Ronson TO, Voelkel MHH, Taylor RJK, Fairlamb IJS. Macrocyclic polyenynes: a stereoselective route to vinyl-ether-containing skipped diene systems. Chem Commun (Camb) 2015; 51:8034-6. [DOI: 10.1039/c5cc02091c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel macrocyclic polyenyne 1, with skipped unsaturation, has been constructed using Pd-catalysed cross-coupling, Wittig olefination and lithiation/alkylation methodologies; the final Stille macrocyclisation utilised the promising precatalyst, AsCat.
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36
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Neff RK, Frantz DE. Recent Advances in the Catalytic Syntheses of Allenes: A Critical Assessment. ACS Catal 2014. [DOI: 10.1021/cs401007m] [Citation(s) in RCA: 214] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Robynne K. Neff
- Department
of Chemistry, The University of Texas at San Antonio, One UTSA
Circle, San Antonio, Texas 78249, United States
| | - Doug E. Frantz
- Department
of Chemistry, The University of Texas at San Antonio, One UTSA
Circle, San Antonio, Texas 78249, United States
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37
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Jolit A, Vazquez-Rodriguez S, Yap GPA, Tius MA. Diastereospecific nazarov cyclization of fully substituted dienones: generation of vicinal all-carbon-atom quaternary stereocenters. Angew Chem Int Ed Engl 2013; 52:11102-5. [PMID: 24002922 PMCID: PMC3872134 DOI: 10.1002/anie.201305218] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 07/23/2013] [Indexed: 11/08/2022]
Abstract
No vacancy: Fully substituted dienones that are highly polarized by a vinylogous carbonate group were found to undergo a remarkably rapid and diastereospecific Nazarov cyclization that led to cyclopentenones with vicinal all-carbon-atom quaternary centers (see example; SEM=2-(trimethylsilyl)ethoxymethyl, Tf=trifluoromethanesulfonyl).
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Affiliation(s)
- Anais Jolit
- Chemistry Department, University of Hawaii at Manoa, 2545 The Mall, Honolulu, HI 96822 (USA), Fax: (+) +1-808-956-5908
| | - Saleta Vazquez-Rodriguez
- Chemistry Department, University of Hawaii at Manoa, 2545 The Mall, Honolulu, HI 96822 (USA), Fax: (+) +1-808-956-5908
| | - Glenn P. A. Yap
- Chemistry Department, University of Hawaii at Manoa, 2545 The Mall, Honolulu, HI 96822 (USA), Fax: (+) +1-808-956-5908, Department of Chemistry & Biochemistry, University of Delaware, 236 Brown Laboratory, Newark, DE 19716 (USA)
| | - Marcus A. Tius
- Chemistry Department, University of Hawaii at Manoa, 2545 The Mall, Honolulu, HI 96822 (USA), Fax: (+) +1-808-956-5908, University of Hawaii Cancer Center, 701 Ilalo Street, Honolulu, HI 96813 (USA)
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38
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Jolit A, Vazquez-Rodriguez S, Yap GPA, Tius MA. Diastereospecific Nazarov Cyclization of Fully Substituted Dienones: Generation of Vicinal All-Carbon-Atom Quaternary Stereocenters. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305218] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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39
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Huang J, Yang JR, Zhang J, Yang J. Total synthesis and structure-activity relationship study of the potent cAMP signaling agonist (-)-alotaketal A. Org Biomol Chem 2013; 11:3212-22. [PMID: 23584129 DOI: 10.1039/c3ob40120k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A detailed account of the first total synthesis of alotaketal A, a tricyclic spiroketal sesterterpenoid that potently activates the cAMP signaling pathway, is provided. The synthesis employs both intra- and intermolecular reductive allylation of esters for assembling one of the fragments and their coupling. A Hg(OAc)2-mediated allylic mercuration is used to introduce the C22-hydroxyl group. The subtle influence of substituents over the course of the spiroketalization process is revealed. The synthesis confirms the relative and absolute stereochemistry of (-)-alotaketal A and allows verification of alotaketal A's effect over cAMP signaling using reporter-based FRET imaging assays with HEK 293T cells. Our studies also revealed alotaketal A's unique activity in selectively targeting nuclear PKA signaling in living cells.
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Affiliation(s)
- Jinhua Huang
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA
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40
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Crouch IT, Neff RK, Frantz DE. Pd-catalyzed asymmetric β-hydride elimination en route to chiral allenes. J Am Chem Soc 2013; 135:4970-3. [PMID: 23488914 DOI: 10.1021/ja401606e] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We wish to report our preliminary results on the discovery and development of a catalytic, asymmetric β-hydride elimination from vinyl Pd(II)-complexes derived from enol triflates to access chiral allenes. To achieve this, we developed a class of chiral phosphite ligands that demonstrate high enantioselectivity, allow access of either allene enantiomer, and are readily synthesized. The methodology is demonstrated on over 20 substrates, and application to the formal asymmetric total synthesis of the natural product, (+)-epibatidine, is also provided.
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Affiliation(s)
- Ian T Crouch
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
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41
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You W, Li Y, Brown MK. Stereoselective Synthesis of All-Carbon Tetrasubstituted Alkenes from In Situ Generated Ketenes and Organometallic Reagents. Org Lett 2013; 15:1610-3. [DOI: 10.1021/ol400392r] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei You
- Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47401, United States
| | - Yan Li
- Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47401, United States
| | - M. Kevin Brown
- Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47401, United States
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42
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Winkler CK, Clay D, Davies S, O'Neill P, McDaid P, Debarge S, Steflik J, Karmilowicz M, Wong JW, Faber K. Chemoenzymatic asymmetric synthesis of pregabalin precursors via asymmetric bioreduction of β-cyanoacrylate esters using ene-reductases. J Org Chem 2013; 78:1525-33. [PMID: 23316696 PMCID: PMC3579311 DOI: 10.1021/jo302484p] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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The asymmetric bioreduction of a library of β-cyanoacrylate
esters using ene-reductases was studied with the aim to provide a
biocatalytic route to precursors for GABA analogues, such as pregabalin.
The stereochemical outcome could be controlled by substrate-engineering
through size-variation of the ester moiety and by employing stereochemically
pure (E)- or (Z)-isomers, which
allowed to access both enantiomers of each product in up to quantitative
conversion in enantiomerically pure form. In addition, stereoselectivities
and conversions could be improved by mutant variants of OPR1, and
the utility of the system was demonstrated by preparative-scale applications.
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Affiliation(s)
- Christoph K Winkler
- Department of Chemistry, Organic & Bioorganic Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
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43
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Chassaing S, Specklin S, Weibel JM, Pale P. Vinyl triflates derived from 1,3-dicarbonyl compounds and analogs: access and applications to organic synthesis. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.107] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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44
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Huang J, Yang JR, Zhang J, Yang J. Total synthesis of the potent cAMP signaling agonist (-)-alotaketal A. J Am Chem Soc 2012; 134:8806-9. [PMID: 22563931 DOI: 10.1021/ja303529z] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have developed a convergent synthetic route to the potent cAMP signaling agonist (-)-alotaketal A that employs two stages of SmI(2)-mediated reductive allylation reactions for assembling the polycycle and fragment coupling. Also notable are a Hg(OAc)(2)-mediated selective alkene oxidation and the subtlety of the formation of the unprecedented spiroketal ring system. The probes AKAR4 and ICUE3 were used to evaluate the cAMP singaling agonistic activity of (-)-alotaketal A and elucidate its structure-activity relationship.
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Affiliation(s)
- Jinhua Huang
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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45
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Stereoselective synthesis of the insect growth regulator (S)-(+)-hydroprene through Suzuki–Miyaura cross-coupling. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.02.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Preparation of chiral secondary boronic esters via copper-catalyzed enantioselective conjugate reduction of β-boronyl-β-alkyl α,β-unsaturated esters. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.07.088] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Mirzayans PM, Pouwer RH, Williams CM, Bernhardt PV. Stereocontrolled Synthesis of the cis-Hydroxydecalin System: Towards Biologically Active 19-nor-Clerodanes. European J Org Chem 2012. [DOI: 10.1002/ejoc.201101807] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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48
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Seashore‐Ludlow B, Danielsson J, Somfai P. Domino Carbopalladation‐Carbonylation: Investigation of Substrate Scope. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100678] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Brinton Seashore‐Ludlow
- Organic Chemistry, Chemical Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden, Fax: (+46)‐8‐791‐2233
| | - Jakob Danielsson
- Organic Chemistry, Chemical Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden, Fax: (+46)‐8‐791‐2233
| | - Peter Somfai
- Organic Chemistry, Chemical Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden, Fax: (+46)‐8‐791‐2233
- Section for Organic Chemistry, Institute of Technology, University of Tartu, 50411 Tartu, Estonia
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49
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Hatakeyama S, Matsubara T, Takahashi K, Ishihara J. STEREOSELECTIVE SYNTHESIS OF THE FUSED γ-LACTONE/δ-LACTONE CORE OF OPHIODILACTONES. HETEROCYCLES 2012. [DOI: 10.3987/com-12-s(n)46] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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50
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Xue H, Yang J, Gopal P. Toward the synthesis of norzoanthamine: building carbocyclic core by a transannular Michael reaction cascade. Org Lett 2011; 13:5696-9. [PMID: 21961953 DOI: 10.1021/ol2024554] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A 12-step synthesis of the ABC carbocyclic core of norzoanthamine is described. It features an organocatalytic asymmetric intramolecular aldolization to set the stereochemistry of the entire molecule, a fragment coupling by selective alkylation of a bis-enolate, and a transannular Michael reaction cascade for rapid and stereoselective synthesis of the polycyclic core.
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Affiliation(s)
- Haoran Xue
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, USA
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