251
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Chen JLY, Aggarwal VK. Highly Diastereoselective and Enantiospecific Allylation of Ketones and Imines Using Borinic Esters: Contiguous Quaternary Stereogenic Centers. Angew Chem Int Ed Engl 2014; 53:10992-6. [DOI: 10.1002/anie.201407127] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Indexed: 11/08/2022]
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252
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Chen JLY, Aggarwal VK. Highly Diastereoselective and Enantiospecific Allylation of Ketones and Imines Using Borinic Esters: Contiguous Quaternary Stereogenic Centers. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407127] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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253
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Kolarovic A, Käslin A, Wennemers H. Stereoselective Synthesis of Indolines via Organocatalytic Thioester Enolate Addition Reactions. Org Lett 2014; 16:4236-9. [DOI: 10.1021/ol501936n] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Andrej Kolarovic
- ETH Zürich, Laboratorium für Organische Chemie, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Alexander Käslin
- ETH Zürich, Laboratorium für Organische Chemie, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Helma Wennemers
- ETH Zürich, Laboratorium für Organische Chemie, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
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254
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Zhao W, Wang Z, Chu B, Sun J. Enantioselective Formation of All-Carbon Quaternary Stereocenters from Indoles and Tertiary Alcohols Bearing A Directing Group. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405252] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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255
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Zhao W, Wang Z, Chu B, Sun J. Enantioselective Formation of All-Carbon Quaternary Stereocenters from Indoles and Tertiary Alcohols Bearing A Directing Group. Angew Chem Int Ed Engl 2014; 54:1910-3. [DOI: 10.1002/anie.201405252] [Citation(s) in RCA: 244] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 06/05/2014] [Indexed: 01/21/2023]
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256
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Zhou F, Cheng GJ, Yang W, Long Y, Zhang S, Wu YD, Zhang X, Cai Q. Enantioselective Formation of Cyano-Bearing All-Carbon Quaternary Stereocenters: Desymmetrization by Copper-Catalyzed N-Arylation. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405575] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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257
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Zhou F, Cheng GJ, Yang W, Long Y, Zhang S, Wu YD, Zhang X, Cai Q. Enantioselective formation of cyano-bearing all-carbon quaternary stereocenters: desymmetrization by copper-catalyzed N-arylation. Angew Chem Int Ed Engl 2014; 53:9555-9. [PMID: 25045110 DOI: 10.1002/anie.201405575] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Indexed: 01/13/2023]
Abstract
The enantioselective construction of all-carbon quaternary stereocenters is one of the most challenging fields in asymmetric synthesis. An asymmetric desymmetrization strategy offers an indirect and efficient method for the formation of all-carbon stereocenters. An enantioselective formation of cyano-bearing all-carbon quaternary stereocenters in 1,2,3,4,-tetrahydroquinolines and 2,3,4,5-tetrahydro-1H-benzo[b]azepines by copper-catalyzed desymmetric N-arylation is demonstrated. The cyano group at the prochiral center plays a key role for the high enantioselectivity and works as an important functional group for further transformations. DFT studies provide a model which successfully accounts for the origin of enantioselectivity.
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Affiliation(s)
- Fengtao Zhou
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences (GIBH), No.190 Kaiyuan Avenue, Guangzhou Science Park, Guangzhou, 510530 (China); Current Address: Molecular Catalyst Research Center, Chubu University, Aichi, 487-8501 (Japan)
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258
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Denmark SE, Wilson TW, Burk MT. Enantioselective construction of quaternary stereogenic carbon atoms by the Lewis base catalyzed additions of silyl ketene imines to aldehydes. Chemistry 2014; 20:9268-79. [PMID: 25043283 DOI: 10.1002/chem.201403342] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Indexed: 11/07/2022]
Abstract
Silyl ketene imines derived from a variety of α-branched nitriles have been developed as highly useful reagents for the construction of quaternary stereogenic centers via the aldol addition reaction. In the presence of SiCl4 and the catalytic action of a chiral phosphoramide, silyl ketene imines undergo extremely rapid and high yielding addition to a wide variety of aromatic aldehydes with excellent diastereo- and enantioselectivity. Of particular note are the high yields and selectivities obtained from electron-rich, electron-poor, and hindered aldehydes. Linear aliphatic aldehydes did react with good diastereo- and enantioselectivity in the presence of nBu4N(+)I(-), but branched aldehydes were much less reactive. Semiempirical calculations provided a rationalization of the observed diastereo- and enantioselectivity via open transitions states.
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Affiliation(s)
- Scott E Denmark
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801 (USA), Fax: (+1) 217-333-3984.
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259
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Mei TS, Patel HH, Sigman MS. Enantioselective construction of remote quaternary stereocentres. Nature 2014; 508:340-4. [PMID: 24717439 PMCID: PMC4007023 DOI: 10.1038/nature13231] [Citation(s) in RCA: 353] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Accepted: 03/04/2014] [Indexed: 12/23/2022]
Abstract
Small molecules that contain all-carbon quaternary stereocentres-carbon atoms bonded to four distinct carbon substituents-are found in many secondary metabolites and some pharmaceutical agents. The construction of such compounds in an enantioselective fashion remains a long-standing challenge to synthetic organic chemists. In particular, methods for synthesizing quaternary stereocentres that are remote from other functional groups are underdeveloped. Here we report a catalytic and enantioselective intermolecular Heck-type reaction of trisubstituted-alkenyl alcohols with aryl boronic acids. This method provides direct access to quaternary all-carbon-substituted β-, γ-, δ-, ε- or ζ-aryl carbonyl compounds, because the unsaturation of the alkene is relayed to the alcohol, resulting in the formation of a carbonyl group. The scope of the process also includes incorporation of pre-existing stereocentres along the alkyl chain, which links the alkene and the alcohol, in which the stereocentre is preserved. The method described allows access to diverse molecular building blocks containing an enantiomerically enriched quaternary centre.
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Affiliation(s)
- Tian-Sheng Mei
- Department of Chemistry, The University of Utah, 315 South, 1400 East, Salt Lake City, Utah 84112, USA
| | - Harshkumar H. Patel
- Department of Chemistry, The University of Utah, 315 South, 1400 East, Salt Lake City, Utah 84112, USA
| | - Matthew S. Sigman
- Department of Chemistry, The University of Utah, 315 South, 1400 East, Salt Lake City, Utah 84112, USA
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260
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Hojoh K, Shido Y, Ohmiya H, Sawamura M. Construction of Quaternary Stereogenic Carbon Centers through Copper-Catalyzed Enantioselective Allylic Cross-Coupling with Alkylboranes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402386] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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261
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Hojoh K, Shido Y, Ohmiya H, Sawamura M. Construction of quaternary stereogenic carbon centers through copper-catalyzed enantioselective allylic cross-coupling with alkylboranes. Angew Chem Int Ed Engl 2014; 53:4954-8. [PMID: 24668885 DOI: 10.1002/anie.201402386] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Indexed: 11/05/2022]
Abstract
A combination of an in situ generated chiral Cu(I) /DTBM-MeO-BIPHEP catalyst system and EtOK enabled the enantioselective SN 2'-type allylic cross-coupling between alkylborane reagents and γ,γ-disubstituted primary allyl chlorides with enantiocontrol at a useful level. The reaction generates a stereogenic quaternary carbon center having three sp(3) -alkyl groups and a vinyl group. This protocol allowed the use of terminal alkenes as nucleophile precursors, thus representing a formal reductive allylic cross-coupling of terminal alkenes. A reaction pathway involving addition/elimination of a neutral alkylcopper(I) species with the allyl chloride substrate is proposed.
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Affiliation(s)
- Kentaro Hojoh
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810 (Japan) http://wwwchem.sci.hokudai.ac.jp/∼orgmet/index.php
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262
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Zhang WX, Xi Z. Organometallic intermediate-based organic synthesis: organo-di-lithio reagents and beyond. Org Chem Front 2014. [DOI: 10.1039/c4qo00231h] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Metal-mediated organic reactions have become one of the great frontiers of organic synthesis.
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Affiliation(s)
- Wen-Xiong Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry
- Peking University
- Beijing 100871, China
| | - Zhenfeng Xi
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry
- Peking University
- Beijing 100871, China
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263
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Ohmiya H, Sawamura M. Copper-Catalyzed Allylic Substitution and Conjugate Addition with Alkylboranes. J SYN ORG CHEM JPN 2014. [DOI: 10.5059/yukigoseikyokaishi.72.1207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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264
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Kamlar M, Hybelbauerová S, Císařová I, Veselý J. Organocatalytic enantioselective allylic alkylation of MBH carbonates with β-keto esters. Org Biomol Chem 2014; 12:5071-6. [DOI: 10.1039/c4ob00682h] [Citation(s) in RCA: 15] [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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265
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Minko Y, Marek I. Stereodefined acyclic trisubstituted metal enolates towards the asymmetric formation of quaternary carbon stereocentres. Chem Commun (Camb) 2014; 50:12597-611. [DOI: 10.1039/c4cc04391j] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Formation of highly diastereo- and enantiomerically enriched quaternary stereocentres from stereodefined acyclic trisubstituted metal enolates.
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Affiliation(s)
- Yury Minko
- The Mallat Family Laboratory of Organic Chemistry
- Schulich Faculty of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry
- Technion – Israel Institute of Technology
- Haifa 320008, Israel
| | - Ilan Marek
- The Mallat Family Laboratory of Organic Chemistry
- Schulich Faculty of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry
- Technion – Israel Institute of Technology
- Haifa 320008, Israel
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