1
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Saudan CM, Berrocosa A, Quintaine J, Spoehrle S, Maggi L, Mosimann H, Saudan L. Highly Selective Rhodium Catalyzed 1,4‐Hydrogenation of Conjugated Dienals. ChemCatChem 2022. [DOI: 10.1002/cctc.202200671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | | | | | - Lionel Saudan
- FIRMENICH Research & Development 7 rue de la Bergère 1242 Satigny SWITZERLAND
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2
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Ando K, Watanabe H, Zhu X. One-Pot Preparation of ( E)-α,β-Unsaturated Aldehydes by a Julia-Kocienski Reaction of 2,2-Dimethoxyethyl PT Sulfone Followed by Acid Hydrolysis. J Org Chem 2021; 86:6969-6973. [PMID: 33870683 DOI: 10.1021/acs.joc.1c00479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
(E)-α,β-Unsaturated aldehydes were synthesized by the Julia-Kocienski reaction of 2,2-dimethoxyethyl 1-phenyl-1H-tetrazol-5-yl (PT) sulfone 3 with various aldehydes, followed by acid hydrolysis. The reaction could be carried out in one pot, and various (E)-α,β-unsaturated aldehydes were obtained in a short time and with high yields.
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Affiliation(s)
- Kaori Ando
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
| | - Haruka Watanabe
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
| | - Xiaoxian Zhu
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
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3
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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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4
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Imada Y, Okada Y, Chiba K. Electrochemical Formation of Cinnamaldehyde by the Electrolyte System
N,N
‐Diisopropylethylamine and 1,1,1,3,3,3‐Hexafluoropropan‐2‐ol. ChemElectroChem 2020. [DOI: 10.1002/celc.202000275] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yasushi Imada
- Department of Applied Biological Science Tokyo University of Agriculture and Technology 3-5-8 Saiwai-cho, Fuchu Tokyo 183-8509 Japan
| | - Yohei Okada
- Department of Chemical Engineering Tokyo University of Agriculture and Technology 2-24-16 Naka-cho, Koganei Tokyo 184-8588 Japan
| | - Kazuhiro Chiba
- Department of Applied Biological Science Tokyo University of Agriculture and Technology 3-5-8 Saiwai-cho, Fuchu Tokyo 183-8509 Japan
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5
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Sugiura H, Yamazaki S, Ogawa A. Sequential Intramolecular Diels–Alder Reaction of 3‐Heteroaryl‐2‐propenylamides of Ethenetricarboxylate. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3665] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hirotaka Sugiura
- Department of Applied Chemistry, Graduate School of EngineeringOsaka Prefecture University Gakuen‐cho 1‐1, Nakaku, Sakai Osaka 599‐8531 Japan
| | - Shoko Yamazaki
- Department of ChemistryNara University of Education Takabatake‐cho Nara 630‐8528 Japan
| | - Akiya Ogawa
- Department of Applied Chemistry, Graduate School of EngineeringOsaka Prefecture University Gakuen‐cho 1‐1, Nakaku, Sakai Osaka 599‐8531 Japan
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6
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Wender PA, Hardman CT, Ho S, Jeffreys MS, Maclaren JK, Quiroz RV, Ryckbosch SM, Shimizu AJ, Sloane JL, Stevens MC. Scalable synthesis of bryostatin 1 and analogs, adjuvant leads against latent HIV. Science 2017; 358:218-223. [PMID: 29026042 PMCID: PMC5714505 DOI: 10.1126/science.aan7969] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 08/04/2017] [Indexed: 11/02/2022]
Abstract
Bryostatin 1 is an exceedingly scarce marine-derived natural product that is in clinical development directed at HIV/AIDS eradication, cancer immunotherapy, and the treatment of Alzheimer's disease. Despite this unique portfolio of indications, its availability has been limited and variable, thus impeding research and clinical studies. Here, we report a total synthesis of bryostatin 1 that proceeds in 29 total steps (19 in the longest linear sequence, >80% average yield per step), collectively produces grams of material, and can be scaled to meet clinical needs (~20 grams per year). This practical solution to the bryostatin supply problem also opens broad, facile, and efficient access to derivatives and potentially superior analogs.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
- Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA
| | - Clayton T Hardman
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Stephen Ho
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | | | - Jana K Maclaren
- Stanford Nano Shared Facilities, Stanford University, Stanford, CA 94305, USA
| | - Ryan V Quiroz
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | | | - Akira J Shimizu
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Jack L Sloane
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Matthew C Stevens
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
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7
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Nishimoto Y, Kang K, Yasuda M. Regio- and Stereoselective Anti-Carbozincation of Alkynyl Ethers Using ZnBr 2 toward (Z)-β-Zincated Enol Ether Synthesis. Org Lett 2017; 19:3927-3930. [PMID: 28700238 DOI: 10.1021/acs.orglett.7b01847] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
(Z)-β-Aryloxyalkenylzincs are synthesized stereoselectively via anti-carbozincation among alkynyl ethers, silyl ketene acetals, and ZnBr2. X-ray analysis revealed the structure of the zinc species is a mononuclear two-coordinate dialkenylzinc that is transformed into functionalized enol ethers as a single isomer in the reaction of various electrophiles.
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Affiliation(s)
- Yoshihiro Nishimoto
- Frontier Research Base for Global Young Researchers, Center for Open Innovation Research and Education (COiRE), Graduate School of Engineering, and ‡Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kyoungmin Kang
- Frontier Research Base for Global Young Researchers, Center for Open Innovation Research and Education (COiRE), Graduate School of Engineering, and ‡Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Makoto Yasuda
- Frontier Research Base for Global Young Researchers, Center for Open Innovation Research and Education (COiRE), Graduate School of Engineering, and ‡Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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8
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Sommer H, Hamilton JY, Fürstner A. A Method for the Late-Stage Formation of Ketones, Acyloins, and Aldols from Alkenylstannanes: Application to the Total Synthesis of Paecilonic Acid A. Angew Chem Int Ed Engl 2017; 56:6161-6165. [DOI: 10.1002/anie.201701391] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Indexed: 01/04/2023]
Affiliation(s)
- Heiko Sommer
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | | | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
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9
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Sommer H, Hamilton JY, Fürstner A. A Method for the Late-Stage Formation of Ketones, Acyloins, and Aldols from Alkenylstannanes: Application to the Total Synthesis of Paecilonic Acid A. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701391] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Heiko Sommer
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | | | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
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10
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McLeod D, McNulty J. DualPhos: a versatile, chemoselective reagent for two-carbon aldehyde to latent ( E)-alkenal homologation and application in the total synthesis of phomolide G. ROYAL SOCIETY OPEN SCIENCE 2016; 3:160374. [PMID: 28018615 PMCID: PMC5180113 DOI: 10.1098/rsos.160374] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 10/07/2016] [Indexed: 06/06/2023]
Abstract
Advances on the use of the 2-pinacolacetal-tripropylphosphonium salt DualPhos as a general reagent for the two-carbon aldehyde to alkenal homologation and a chemoselective iron (III) chloride mediated deprotection are described. The strategy allows isolation of the latent alkenal intermediates or direct hydrolysis to (E)-alkenals. The robust chemical stability of the latent alkenals is demonstrated in a total synthesis of the macrolactone phomolide G.
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11
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Alonso-Fernández J, Benaiges C, Casas E, Alibés R, Bayón P, Busqué F, Álvarez-Larena Á, Figueredo M. Synthetic studies on Stemona alkaloids. Construction of the sessilifoliamides B and C and 1,12-secostenine skeleton. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.04.077] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Hayashi Y, Sakamoto D, Okamura D. One-Pot Synthesis of (S)-Baclofen via Aldol Condensation of Acetaldehyde with Diphenylprolinol Silyl Ether Mediated Asymmetric Michael Reaction as a Key Step. Org Lett 2015; 18:4-7. [DOI: 10.1021/acs.orglett.5b02839] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yujiro Hayashi
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Daisuke Sakamoto
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Daichi Okamura
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza Aoba-ku, Sendai, Miyagi 980-8578, Japan
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13
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Riveira MJ, Trigo-Mouriño P, Troche-Pesqueira E, Martin GE, Navarro-Vázquez A, Mischne MP, Gil RR. Self-Sensitized Photooxygenation of 2H-Pyrans: Characterization of Unexpected Products Assisted by Computed Structural Elucidation and Residual Dipolar Couplings. J Org Chem 2015; 80:7396-402. [DOI: 10.1021/acs.joc.5b00817] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Martín J. Riveira
- Instituto
de Química Rosario, Facultad de Ciencias Bioquímicas
y Farmacéuticas, Universidad Nacional de Rosario-CONICET, Suipacha
531, S2002LRK Rosario, Argentina
| | - Pablo Trigo-Mouriño
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Eduardo Troche-Pesqueira
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
- Departamento
de Química Orgánica, Edificio de Ciencias Experimentais, Universidade de Vigo,
Campus Universitario, 36310 Vigo, Spain
| | - Gary E. Martin
- NMR Structure Elucidation, Process & Analytical Chemistry, Merck Research Laboratories, Rahway, New Jersey 07065, United States
| | - Armando Navarro-Vázquez
- Departamento
de Química Fundamental, Universidade Federal de Pernambuco, Cidade Universitária,
CEP 50.740-540 Recife, Pernambuco, Brazil
| | - Mirta P. Mischne
- Instituto
de Química Rosario, Facultad de Ciencias Bioquímicas
y Farmacéuticas, Universidad Nacional de Rosario-CONICET, Suipacha
531, S2002LRK Rosario, Argentina
| | - Roberto R. Gil
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
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14
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DeBerardinis AM, Raccuia DS, Thompson EN, Maschinot CA, Kyle Hadden M. Vitamin D3 analogues that contain modified A- and seco-B-rings as hedgehog pathway inhibitors. Eur J Med Chem 2015; 93:156-71. [PMID: 25676864 DOI: 10.1016/j.ejmech.2015.01.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 01/21/2015] [Accepted: 01/24/2015] [Indexed: 10/24/2022]
Abstract
The hedgehog (Hh) signaling pathway is a developmental signaling pathway that has been implicated as a target for anti-cancer drug development in a variety of human malignancies. Several natural and synthetic vitamin D-based seco-steroids have been identified as potent inhibitors of Hh signaling with chemotherapeutic potential. These include the previously characterized analogue 4, which contains the northern CD-ring/side chain region of vitamin D3 (VD3) linked to an aromatic A-ring mimic through an ester bond. To further explore structure-activity relationships for this class of VD3-based Hh pathway inhibitors, we have designed, synthesized and evaluated several series of compounds that modify the length, composition, and stereochemical orientation of the ester linker. These studies have identified compounds 54 and 55, which contain an amine linker and an aromatic A-ring incorporating a para-phenol, as new lead compounds with enhanced potency against the Hh pathway (IC50 values = 0.40 and 0.32 μM, respectively).
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Affiliation(s)
- Albert M DeBerardinis
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd, Unit 3092, Storrs, CT 06269-3092, USA
| | - Daniel S Raccuia
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd, Unit 3092, Storrs, CT 06269-3092, USA
| | - Evrett N Thompson
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd, Unit 3092, Storrs, CT 06269-3092, USA
| | - Chad A Maschinot
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd, Unit 3092, Storrs, CT 06269-3092, USA
| | - M Kyle Hadden
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd, Unit 3092, Storrs, CT 06269-3092, USA.
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15
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Riveira MJ, Mischne MP. An Interrupted Vinylogous Iso-Nazarov Reaction: Cycloisomerization of Conjugated Trienones to Cyclopenta[b]furan Derivatives. J Org Chem 2014; 79:8244-54. [DOI: 10.1021/jo501453b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Martín J. Riveira
- Instituto
de Química
Rosario-CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Santa Fe, Argentina
| | - Mirta P. Mischne
- Instituto
de Química
Rosario-CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Santa Fe, Argentina
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16
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Toyota M, Kagawa N, Sasaki Y, Sakaguchi S, Nagatomo A, Kojima H. Rare Earth Triflates/Chlorotrimethylsilane-Promoted One-Pot Synthesis of Enals. HETEROCYCLES 2014. [DOI: 10.3987/com-13-s(s)98] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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18
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Riveira MJ, Mischne MP. One-Pot Organocatalytic Tandem Aldol/Polycyclization Reactions between 1,3-Dicarbonyl Compounds and α,β,γ,δ-Unsaturated Aldehydes for the Straightforward Assembly of Cyclopenta[b]furan-Type Derivatives: New Insight into the Knoevenagel Reaction. Chemistry 2012; 18:2382-8. [DOI: 10.1002/chem.201103080] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Indexed: 11/11/2022]
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19
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Chiral N-heterocyclic carbene-catalyzed generation of ester enolate equivalents from {alpha},{beta}-unsaturated aldehydes for enantioselective Diels-Alder reactions. Proc Natl Acad Sci U S A 2010; 107:20661-5. [PMID: 20974930 DOI: 10.1073/pnas.1007469107] [Citation(s) in RCA: 159] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The catalytic generation of chiral ester enolate equivalents from α,β-unsaturated aldehydes with chiral N-hetereocyclic carbene catalysts makes possible highly enantioselective hetero-Diels-Alder reactions. The reactions proceed under simple, mild conditions with both aliphatic and aromatic substituted enals as substrates. Previous attempts to employ these starting materials as enolate precursors gave structurally different products via catalytically generated homoenolate equivalents. Critical to the success of the enolate generation was the strength of the catalytic base used to generate the active N-heterocyclic carbene catalyst. To complement these studies, we have investigated the enolate structure using computational methods and find that it prefers conformations perpendicular to the triazolium core.
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20
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Valenta P, Carroll PJ, Walsh PJ. Stereoselective synthesis of β-hydroxy enamines, aminocyclopropanes, and 1,3-amino alcohols via asymmetric catalysis. J Am Chem Soc 2010; 132:14179-90. [PMID: 20853837 PMCID: PMC3014220 DOI: 10.1021/ja105435y] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tandem methods for the catalytic asymmetric preparation of enantioenriched β-hydroxy (E)-enamines and aminocyclopropanes are presented. The diastereoselective hydrogenation of enantioenriched (E)-trisubstituted hydroxy enamines to generate 1,2-disubstituted-1,3-amino alcohols is also outlined. These methods are initiated by highly regioselective hydroboration of N-tosyl-substituted ynamides with diethylborane to generate β-amino alkenyl boranes. In situ boron-to-zinc transmetalation generates β-amino alkenylzinc reagents. These functionalized vinylzinc intermediates are subsequently added to aldehydes in the presence of a catalyst derived from an enantioenriched amino alcohol (morpholino isoborneol, MIB). The catalyst promotes highly enantioselective C-C bond formation to provide β-hydroxy enamines in good isolated yields (68-86%) with 54-98% enantioselectivity. The intermediate zinc β-alkoxy enamines can be subjected to a tandem cyclopropanation to afford aminocyclopropyl carbinols with three continuous stereocenters in a one-pot procedure with good yields (72-82%), enantioselectivities of 76-94%, and >20:1 diastereomeric ratios. Diastereoselective hydrogenation of isolated enantioenriched β-hydroxy enamines over Pd/C furnished syn-1,2-disubstituted-1,3-amino alcohols in high yields (82-90%) with moderate to excellent diastereoselectivities. These methods were used in an efficient preparation of the enantioenriched precursor to PRC200-SS derivatives, which are potent serotonin-norepinephrine-dopamine reuptake inhibitors.
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Affiliation(s)
- Petr Valenta
- P. Roy and Diana T. Vagelos Laboratories, University of Pennsylvania, Department of Chemistry, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323
| | - Patrick J. Carroll
- P. Roy and Diana T. Vagelos Laboratories, University of Pennsylvania, Department of Chemistry, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323
| | - Patrick J. Walsh
- P. Roy and Diana T. Vagelos Laboratories, University of Pennsylvania, Department of Chemistry, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323
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21
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Kagawa N, Sasaki Y, Kojima H, Toyota M. Rare earth triflates/chlorotrimethylsilane induced activation of triethylamine as a latent acetaldehyde anion: a new synthesis of α,β-unsaturated aldehydes. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.11.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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22
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Chiang PC, Kim Y, Bode JW. Catalytic amide formation with alpha'-hydroxyenones as acylating reagents. Chem Commun (Camb) 2009:4566-8. [PMID: 19617985 PMCID: PMC2893382 DOI: 10.1039/b909360e] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alpha'-hydroxyenones undergo clean, catalytic amidations with amines promoted by the combination of an N-heterocyclic carbene and 1,2,4-triazole.
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Affiliation(s)
- Pei-Chen Chiang
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, USA
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