1
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St John-Campbell S, Sheppard T. Imine Azaenolates: Synthesis, Reactivity and Outlook. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Tom Sheppard
- University College London UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
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2
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Wang Y, Niu C, Xie DH, Du DM. A bifunctional squaramide-catalysed enantioselective vinylogous Michael addition/cyclization cascade reaction of 4-unsaturated isoxazol-5-ones and α,α-dicyanoalkenes. Org Biomol Chem 2021; 19:8572-8577. [PMID: 34549755 DOI: 10.1039/d1ob01256h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
An effective strategy for the stereoselective synthesis of spiro isoxazolone-cyclohexenimines was developed using a bifunctional squaramide-catalysed vinylogous Michael addition/cyclization cascade reaction of 4-unsaturated isoxazol-5-ones and α,α-dicyanoalkenes. The atom-economical cascade process can proceed smoothly under extremely low catalyst loading (1 mol%) and mild conditions, and the corresponding products were obtained in moderate to good yields (45% to 90%) and enantioselectivitites (51% to 96% ee). Meanwhile, the scale-up reaction and transformation of the products were also demonstrated.
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Affiliation(s)
- Yu Wang
- Key Laboratory of Medical Molecule Science & Pharmaceutics Engineering, Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 100081, People's Republic of China.
| | - Cheng Niu
- Key Laboratory of Medical Molecule Science & Pharmaceutics Engineering, Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 100081, People's Republic of China.
| | - Dong-Hua Xie
- Key Laboratory of Medical Molecule Science & Pharmaceutics Engineering, Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 100081, People's Republic of China.
| | - Da-Ming Du
- Key Laboratory of Medical Molecule Science & Pharmaceutics Engineering, Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 100081, People's Republic of China.
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3
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Lu D, Lu P, Lu Z. Cobalt‐Catalyzed Asymmetric 1,4‐Reduction of
β,β‐
Dialkyl
α
,
β
‐Unsaturated Esters with PMHS. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100856] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Dongpo Lu
- Department of Chemistry Zhejiang University Hangzhou 310058 China
| | - Peng Lu
- Department of Chemistry Zhejiang University Hangzhou 310058 China
| | - Zhan Lu
- Department of Chemistry Zhejiang University Hangzhou 310058 China
- College of Chemistry Zhengzhou University Zhengzhou 450001 China
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education Hangzhou Normal University Hangzhou 310058 China
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4
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5
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6
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Wu QF, Shen PX, He J, Wang XB, Zhang F, Shao Q, Zhu RY, Mapelli C, Qiao JX, Poss MA, Yu JQ. Formation of α-chiral centers by asymmetric β-C(sp3)-H arylation, alkenylation, and alkynylation. Science 2017; 355:499-503. [PMID: 28154075 DOI: 10.1126/science.aal5175] [Citation(s) in RCA: 150] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 01/05/2017] [Indexed: 01/20/2023]
Abstract
The enzymatic β-C-H hydroxylation of the feedstock chemical isobutyric acid has enabled the asymmetric synthesis of a wide variety of polyketides. The analogous transition metal-catalyzed enantioselective β-C-H functionalization of isobutyric acid-derived substrates should provide a versatile method for constructing useful building blocks with enantioenriched α-chiral centers from this abundant C-4 skeleton. However, the desymmetrization of ubiquitous isopropyl moieties by organometallic catalysts has remained an unanswered challenge. Herein, we report the design of chiral mono-protected aminomethyl oxazoline ligands that enable desymmetrization of isopropyl groups via palladium insertion into the C(sp3)-H bonds of one of the prochiral methyl groups. We detail the enantioselective β-arylation, -alkenylation, and -alkynylation of isobutyric acid/2-aminoisobutyric acid derivatives, which may serve as a platform for the construction of α-chiral centers.
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Affiliation(s)
- Qing-Feng Wu
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Peng-Xiang Shen
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Jian He
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Xiao-Bing Wang
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Forrest Zhang
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Qian Shao
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Ru-Yi Zhu
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Claudio Mapelli
- Discovery Chemistry, Research and Development, Bristol-Myers Squibb Company, P.O. Box 4000, Princeton, NJ 08543, USA
| | - Jennifer X Qiao
- Discovery Chemistry, Research and Development, Bristol-Myers Squibb Company, P.O. Box 4000, Princeton, NJ 08543, USA
| | - Michael A Poss
- Discovery Chemistry, Research and Development, Bristol-Myers Squibb Company, P.O. Box 4000, Princeton, NJ 08543, USA
| | - Jin-Quan Yu
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
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7
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Yang GJ, Du W, Chen YC. Construction of Furan Derivatives with a Trifluoromethyl Stereogenic Center: Enantioselective Friedel-Crafts Alkylations via Formal Trienamine Catalysis. J Org Chem 2016; 81:10056-10061. [PMID: 27668675 DOI: 10.1021/acs.joc.6b01950] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
An asymmetric Friedel-Crafts alkylation reaction of 2-furfuryl ketones with β-trifluoromethyl enones has been developed via formal trienamine catalysis of a bifunctional primary amine-thiourea substance derived from L-tert-leucine, delivering the furan derivatives incorporating a stereogenic trifluoromethyl (CF3) group in good to high yields with excellent enantioselectivity.
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Affiliation(s)
- Guang-Jun Yang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, Sichuan University , Chengdu 610041, China
| | - Wei Du
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, Sichuan University , Chengdu 610041, China
| | - Ying-Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, Sichuan University , Chengdu 610041, China.,College of Pharmacy, Third Military Medical University , Shapingba, Chongqing 400038, China
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8
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Kim JH, Ko YO, Bouffard J, Lee SG. Advances in tandem reactions with organozinc reagents. Chem Soc Rev 2015; 44:2489-507. [DOI: 10.1039/c4cs00430b] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A review of recent advances in tandem reactions with organozinc reagents that highlight their utility in organic synthesis.
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Affiliation(s)
- Ju Hyun Kim
- Department of Chemistry and Nano Science (BK 21 Plus)
- Ewha Womans University
- 120-750 Seoul
- Korea
| | - Young Ok Ko
- Department of Chemistry and Nano Science (BK 21 Plus)
- Ewha Womans University
- 120-750 Seoul
- Korea
| | - Jean Bouffard
- Department of Chemistry and Nano Science (BK 21 Plus)
- Ewha Womans University
- 120-750 Seoul
- Korea
| | - Sang-gi Lee
- Department of Chemistry and Nano Science (BK 21 Plus)
- Ewha Womans University
- 120-750 Seoul
- Korea
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9
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Smirnov P, Katan E, Mathew J, Kostenko A, Karni M, Nijs A, Bolm C, Apeloig Y, Marek I. Formation of Three New Bonds and Two Stereocenters in Acyclic Systems by Zinc-Mediated Enantioselective Alkynylation of Acylsilanes, Brook Rearrangement, and Ene-Allene Carbocyclization Reactions. J Org Chem 2014; 79:12122-35. [DOI: 10.1021/jo501977r] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Polina Smirnov
- 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, Technion City, Haifa 32000, Israel
| | - Einat Katan
- 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, Technion City, Haifa 32000, Israel
| | - Jomon Mathew
- 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, Technion City, Haifa 32000, Israel
| | - Arseni Kostenko
- 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, Technion City, Haifa 32000, Israel
| | - Miriam Karni
- 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, Technion City, Haifa 32000, Israel
| | - Anne Nijs
- Institut für Organische Chemie der RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Carsten Bolm
- Institut für Organische Chemie der RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Yitzhak Apeloig
- 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, Technion City, Haifa 32000, 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, Technion City, Haifa 32000, Israel
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10
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Liu J, Dang HS. Carbolithiation of Styrenes with N-tert-butyl aldimines. JOURNAL OF CHEMICAL RESEARCH 2012. [DOI: 10.3184/174751912x13528268645571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The addition of aldimine anions to styrene occurs upon the treatment of N-tert-butyl aldimine with LDA followed by the addition of styrene to give the corresponding aldehyde after hydrolysis. Cyclohexenyl amines are generated when the reactions are performed with unsaturated aldimines. This approach affords 4-phenyl substituted butanals and cyclohexenyl amines in a simple and inexpensive way.
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Affiliation(s)
- Jie Liu
- Fragrance Science & Technology, Givaudan Fragrances (Shanghai) Ltd, 298 Li Shi Zhen Road, Shanghai 201203, P. R. China
| | - Hai-Shan Dang
- Fragrance Science & Technology, Givaudan Fragrances (Shanghai) Ltd, 298 Li Shi Zhen Road, Shanghai 201203, P. R. China
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11
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Majima S, Shimizu Y, Kanai M. Cu(I)-catalyzed α-alkylation of ketones with styrene derivatives. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.06.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Unger R, Cohen T, Marek I. Diastero- and enantioselective intramolecular carbometalation reaction. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.04.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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De Sterck B, Van Speybroeck V, Mangelinckx S, Verniest G, De Kimpe N, Waroquier M. Theoretical Study on the Structural Properties of Various Solvated Metalated 3-Halo-1-azaallylic Anions. J Phys Chem A 2009; 113:6375-80. [DOI: 10.1021/jp811317y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bart De Sterck
- Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium, and Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
| | - Veronique Van Speybroeck
- Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium, and Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
| | - Sven Mangelinckx
- Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium, and Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
| | - Guido Verniest
- Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium, and Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
| | - Norbert De Kimpe
- Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium, and Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
| | - Michel Waroquier
- Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium, and Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
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14
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Tsuji H, Tanaka I, Endo K, Yamagata KI, Nakamura M, Nakamura E. Indium-Catalyzed [1 + n] Annulation Reaction between β-Ketoester and α,ω-Diyne. Org Lett 2009; 11:1845-7. [DOI: 10.1021/ol9003542] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hayato Tsuji
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Iku Tanaka
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kohei Endo
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ken-ichi Yamagata
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masaharu Nakamura
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Eiichi Nakamura
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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15
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Yoshikai N, Zhang SL, Yamagata KI, Tsuji H, Nakamura E. Mechanistic Study of the Manganese-Catalyzed [2 + 2 + 2] Annulation of 1,3-Dicarbonyl Compounds and Terminal Alkynes. J Am Chem Soc 2009; 131:4099-109. [DOI: 10.1021/ja809202y] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Naohiko Yoshikai
- Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Song-Lin Zhang
- Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Ken-ichi Yamagata
- Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Hayato Tsuji
- Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Eiichi Nakamura
- Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
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16
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Hatakeyama T, Nakamura M, Nakamura E. Diastereoselective Addition of Zincated Hydrazones to Alkenylboronates and Stereospecific Trapping of Boron/Zinc Bimetallic Intermediates by Carbon Electrophiles. J Am Chem Soc 2008; 130:15688-701. [DOI: 10.1021/ja806258v] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takuji Hatakeyama
- Department of Chemistry, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masaharu Nakamura
- Department of Chemistry, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Eiichi Nakamura
- Department of Chemistry, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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17
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18
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Pérez-Luna A, Botuha C, Ferreira F, Chemla F. Carbometalation of unactivated alkenes by zinc enolate derivatives. NEW J CHEM 2008. [DOI: 10.1039/b716292h] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Hatakeyama T, Ito S, Yamane H, Nakamura M, Nakamura E. Regioselective α-alkylation of ketones with alkyl chlorides and fluorides via highly nucleophilic magnesium enamides. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.05.087] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Soorukram D, Knochel P. Copper-catalyzed preparation of ketones bearing a stereogenic center in alpha position. Angew Chem Int Ed Engl 2007; 45:3686-9. [PMID: 16646096 DOI: 10.1002/anie.200600247] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Darunee Soorukram
- Department Chemie and Biochemistry, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany
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21
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Nakamura M, Ilies L, Otsubo S, Nakamura E. 3-zinciobenzofuran and 3-zincioindole: versatile tools for the construction of conjugated structures containing multiple benzoheterole units. Angew Chem Int Ed Engl 2007; 45:944-7. [PMID: 16385605 DOI: 10.1002/anie.200502920] [Citation(s) in RCA: 130] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Masaharu Nakamura
- Department of Chemistry, University of Tokyo and Nakamura Functional Carbon Cluster Project ERATO, Japan Science and Technology Agency, Hongo, Bunkyo-ku.
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22
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Li K, Alexakis A. Copper-Catalyzed Enantioselective Intramolecular Conjugate Addition/Trapping Reactions: Synthesis of Cyclic Compounds with Multichiral Centers. Chemistry 2007; 13:3765-71. [PMID: 17245784 DOI: 10.1002/chem.200601327] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The Cu-catalyzed enantioselective conjugate addition of dialkylzinc to bis-alpha,beta-unsaturated carbonyl compounds followed by the intramolecular trapping of the zinc enolate in the presence of chiral phosphoramidite ligands was investigated. Cyclic and heterocyclic compounds with multichiral centers were formed as a mixture of two diastereomers with excellent diastereoselectivities (up to 99:1) and enantioselectivities (up to 94 % ee, ee=enantiomeric excess). The stereochemistry was determined to be trans,trans for the major products and trans,cis for the minor products. The absolute configuration of the cyclic compounds was assigned by comparison with the analogous adduct derived from trans-3-nonen-2-one and Et(2)Zn or the adduct obtained through conjugate addition of Me(2)Zn to trans-1-phenyl-non-2-en-1-one. Further transformation of these cyclic products into more complex compounds is under investigation in our laboratory.
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Affiliation(s)
- Kangying Li
- Department of Organic Chemistry, University of Geneva, 30 quai E. Ansermet, 1211 Geneva 4, Switzerland
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23
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Movassaghi M, Chen B. Stereoselective intermolecular formal [3+3] cycloaddition reaction of cyclic enamines and enones. Angew Chem Int Ed Engl 2007; 46:565-8. [PMID: 17146819 PMCID: PMC3510678 DOI: 10.1002/anie.200603302] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mohammad Movassaghi
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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24
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Movassaghi M, Chen B. Stereoselective Intermolecular Formal [3+3] Cycloaddition Reaction of Cyclic Enamines and Enones. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200603302] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Soorukram D, Knochel P. Kupfer-katalysierte Synthese von Ketonen mit α-stereogenem Zentrum. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600247] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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26
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Yamashita M, Yamada KI, Tomioka K. Chiral amino alcohol-mediated asymmetric conjugate addition of arylalkynes to nitroolefins. Org Lett 2006; 7:2369-71. [PMID: 15932200 DOI: 10.1021/ol050643p] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] The asymmetric reaction of nitroolefins with arylalkynes was mediated by dimethylzinc (or diethylzinc) and (1R,2R)-2-(dimethylamino)-1,2-diphenylethanol in toluene to provide the corresponding conjugate alkynylation products with high enantiomeric excess of up to 99% in good yields. The presence of 0.03 equiv of galvinoxyl improved the reaction yield.
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Affiliation(s)
- Mitsuaki Yamashita
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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27
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Nakamura M, Ilies L, Otsubo S, Nakamura E. 3-Zinciobenzofuran and 3-Zincioindole: Versatile Tools for the Construction of Conjugated Structures Containing Multiple Benzoheterole Units. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200502920] [Citation(s) in RCA: 35] [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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28
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Kuninobu Y, Kawata A, Takai K. Rhenium-Catalyzed Insertion of Terminal Acetylenes into a C−H Bond of Active Methylene Compounds. Org Lett 2005; 7:4823-5. [PMID: 16235898 DOI: 10.1021/ol0515208] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] A rhenium complex, [ReBr(CO)(3)(thf)](2), catalyzed the intermolecular reactions of 1,3-dicarbonyl compounds with terminal acetylenes and gave the corresponding alkenyl derivatives in excellent yields. These reactions could apply to an intramolecular version and gave the corresponding cyclic compounds quantitatively.
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Affiliation(s)
- Yoichiro Kuninobu
- Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Japan.
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Bueno A, Moreno RM, Moyano A. 1-Amino-1-ferrocenyl-2-methyl-2-propanol: a case study on the conformational control of asymmetric induction. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.tetasy.2005.03.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhu HJ, Jiang JX, Saebo S, Pittman CU. Chiral Ligands Derived from Abrine 8. An Experimental and Theoretical Study of Free Ligand Conformational Preferences and the Addition of Diethylzinc to Benzaldehyde. J Org Chem 2004; 70:261-7. [PMID: 15624931 DOI: 10.1021/jo049754c] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Three structurally similar series of 1,2,3,4-tetrahydro-beta-carboline ligands, 4a-d, 6a-d and 7a-d, and two series of chiral oxazolidines, 8a-d and 9a-g, were synthesized and used as chiral catalysts in the addition of diethylzinc to benzaldehyde. The enantioselectivities of the resulting 1-phenyl-1-propanol were obtained in each case, and these ee values were, in most cases, related to the conformational populations of the free ligand as expressed by the calculated differences in the energies of the ligand conformations formed by inversion at nitrogen. This suggested the possible existence of a linear free energy relationship. The effect on enantioselectivity of the carbon chain length of the R group located (1) on the C-3 substituent of 4a-d, 6a-d, and 7a-d or (2) at C-5 in 8a-d and 9a-g was studied in detail. On the basis of the correlations observed and the ligands' structural characterization, a structure was proposed for the transition state during ethyl group transfer when using ligands 8a-d. Furthermore, the change in enantioselectivity was successfully predicted when diastereomeric ligands 11 and 12 were compared in this chiral addition.
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Affiliation(s)
- H J Zhu
- Kunming Institute of Botany, Kunming, 650204, Yunnan, China.
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Liao S, Collum DB. Lithium Diisopropylamide-Mediated Lithiations of Imines: Insights into Highly Structure-Dependent Rates and Selectivities. J Am Chem Soc 2003; 125:15114-27. [PMID: 14653747 DOI: 10.1021/ja030409z] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Lithium diisopropylamide-mediated lithiations of N-alkyl ketimines derived from cyclohexanones reveal that simple substitutions on the N-alkyl side chain and the 2-position of the cyclohexyl moiety afford a 60,000-fold range of rates. Detailed rate studies implicate monosolvated monomers at the rate-limiting transition structures in all instances. Comparisons of experimentally derived regioselectivities and rates, taken in conjunction with density functional theory computational studies, reveal a number of factors that influence reactivities including: (a) axial versus equatorial disposition of the proton on the cyclohexane ring, (b) syn versus anti orientation of the lithiation relative to the N-alkyl group, (c) the presence or absence of a potentially chelating methoxy moiety on the N-alkyl group, (d) the presence of a 2-methyl substituent at the geminal or distal alpha-carbon, and (e) branching in the N-alkyl group. The isolated contributions are not large, yet they display a strong and predictable additivity leading to a kinetic resolution of imines derived from racemic 2-methylcyclohexanone.
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Affiliation(s)
- Songping Liao
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA
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