1
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Wang L, Lv J, Zhang Y, Yang D. Asymmetric magnesium catalysis for important chiral scaffold synthesis. Org Biomol Chem 2024; 22:4778-4800. [PMID: 38809153 DOI: 10.1039/d4ob00521j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Magnesium catalysts are widely used in catalytic asymmetric reactions, and a series of catalytic strategies have been developed in recent years. Herein, in this review, we have tried to summarize asymmetric magnesium catalysis for the synthesis of important chiral scaffolds. Several important optically active motifs that are present in classic chiral ligands or natural products synthesized by Mg(II) catalytic methods are briefly discussed. Moreover, the representative mechanisms for different magnesium catalytic strategies, including in situ generated magnesium catalysts, are also shown in relation to synthetic routes for obtaining these important chiral scaffolds.
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Affiliation(s)
- Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, China.
| | - Jiaming Lv
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, China.
| | - Yongshuo Zhang
- Scientific Research and Innovation Expert Studio of China Inspection and Certification Group Liaoning Co., Ltd, Dalian, 116039, China
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, China.
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2
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Kutateladze DA, Jacobsen EN. Cooperative Hydrogen-Bond-Donor Catalysis with Hydrogen Chloride Enables Highly Enantioselective Prins Cyclization Reactions. J Am Chem Soc 2021; 143:20077-20083. [PMID: 34812618 PMCID: PMC8717859 DOI: 10.1021/jacs.1c10890] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Cooperative asymmetric catalysis with hydrogen chloride (HCl) and chiral dual-hydrogen-bond donors (HBDs) is applied successfully to highly enantioselective Prins cyclization reactions of a wide variety of simple alkenyl aldehydes. The optimal chiral catalysts were designed to withstand the strongly acidic reaction conditions and were found to induce rate accelerations of 2 orders of magnitude over reactions catalyzed by HCl alone. We propose that the combination of strong mineral acids and chiral hydrogen-bond-donor catalysts may represent a general strategy for inducing enantioselectivity in reactions that require highly acidic conditions.
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Affiliation(s)
- Dennis A. Kutateladze
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Eric N. Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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3
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4
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Abstract
This review updates the major progress in the field of enantioselective transformations promoted by chiral magnesium catalysts, covering the literature since 2007, illustrating the power of these green catalysts to promote many types of reactions.
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5
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Lv J, Zhang Q, Zhong X, Luo S. Asymmetric Latent Carbocation Catalysis with Chiral Trityl Phosphate. J Am Chem Soc 2015; 137:15576-83. [PMID: 26594778 DOI: 10.1021/jacs.5b11085] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Stable carbocations such as tritylium ions have been widely explored as organic Lewis acid catalysts and reagents in organic synthesis. However, achieving asymmetric carbocation catalysis remains elusive ever since they were first identified over one century ago. The challenges mainly come from their limited compatibility, scarcity of chiral carbocations, as well as the extremely low barrier to racemization of chiral carbenium ions. We reported here a latent concept for asymmetric carbocation catalysis. In this strategy, chiral trityl phosphate is employed as the carbocation precursor, which undergoes facile ionic dissociation upon mild external stimulation (e.g., acid, H-bonding, polar substrates) to form a catalytically active chiral ion pair for substrate activation and chiral induction. The latent strategy provides a solution for the long sought-after asymmetric carbocation catalysis as illustrated in three different enantioselective transformations.
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Affiliation(s)
- Jian Lv
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.,Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071, China
| | - Qichao Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Xingren Zhong
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Sanzhong Luo
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.,Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071, China
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6
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Liu L, Leutzsch M, Zheng Y, Alachraf MW, Thiel W, List B. Confined Acid-Catalyzed Asymmetric Carbonyl–Ene Cyclization. J Am Chem Soc 2015; 137:13268-71. [DOI: 10.1021/jacs.5b09484] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luping Liu
- Max-Planck-Institut für Kohlenforschung, Kaiser
Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, Kaiser
Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Yiying Zheng
- Max-Planck-Institut für Kohlenforschung, Kaiser
Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - M. Wasim Alachraf
- Max-Planck-Institut für Kohlenforschung, Kaiser
Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Walter Thiel
- Max-Planck-Institut für Kohlenforschung, Kaiser
Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Benjamin List
- Max-Planck-Institut für Kohlenforschung, Kaiser
Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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7
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Ren H, Wang P, Wang L, Tang Y. Catalytic Asymmetric Synthesis of 3-Hydroxy-3-trifluoromethyl Benzofuranones via Tandem Friedel–Crafts/Lactonization Reaction. Org Lett 2015; 17:4886-9. [DOI: 10.1021/acs.orglett.5b02440] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hai Ren
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, P. R. China
| | - Pan Wang
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, P. R. China
| | - Lijia Wang
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, P. R. China
| | - Yong Tang
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, P. R. China
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8
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Zhang X, Wang M, Ding R, Xu YH, Loh TP. Highly Enantioselective and Anti-Diastereoselective Catalytic Intermolecular Glyoxylate–Ene Reactions: Effect of the Geometrical Isomers of Alkenes. Org Lett 2015; 17:2736-9. [DOI: 10.1021/acs.orglett.5b01151] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiang Zhang
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Min Wang
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Ran Ding
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yun-He Xu
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Teck-Peng Loh
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, Singapore 637371
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9
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Itoh H, Maeda H, Yamada S, Hori Y, Mino T, Sakamoto M. BINOL-Al catalysed asymmetric cyclization and amplification: preparation of optically active menthol analogs. Org Biomol Chem 2015; 13:5817-25. [PMID: 25913595 DOI: 10.1039/c5ob00433k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We report a highly selective asymmetric ring-closing ene reaction catalysed by aluminum complexes with chiral BINOL. This reaction yields optically active 6-membered cyclized alcohols from unsaturated aldehydes, with good diastereo- and enantioselectivities. Asymmetric amplification of this reaction was investigated by varying the ee of the BINOL employed in the catalyst.
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Affiliation(s)
- Hisanori Itoh
- Takasago International Corporation, 4-11, Nishi-Yawata 1-Chome, Hiratsuka City, Kanagawa 254-0073, Japan.
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10
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Zhao X, Liu X, Mei H, Guo J, Lin L, Feng X. Asymmetric Dearomatization of Indoles through a Michael/Friedel-Crafts-Type Cascade To Construct Polycyclic Spiroindolines. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201410814] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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11
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Zhao X, Liu X, Mei H, Guo J, Lin L, Feng X. Asymmetric Dearomatization of Indoles through a Michael/Friedel-Crafts-Type Cascade To Construct Polycyclic Spiroindolines. Angew Chem Int Ed Engl 2015; 54:4032-5. [DOI: 10.1002/anie.201410814] [Citation(s) in RCA: 149] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 12/22/2015] [Indexed: 01/15/2023]
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12
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Pei QL, Cui BD, Han WY, Wu ZJ, Zhang XM, Yuan WC. A facile synthesis of 3-hydroxy-3-(trifluoromethyl)-1H-pyrrol-2(3H)-ones with Brønsted acid-catalyzed condensation–cyclization reactions of β-enamino esters and ethyl trifluoropyruvate. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.05.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Wang T, Hao XQ, Huang JJ, Niu JL, Gong JF, Song MP. Chiral Bis(imidazolinyl)phenyl NCN Pincer Rhodium(III) Catalysts for Enantioselective Allylation of Aldehydes and Carbonyl–Ene Reaction of Trifluoropyruvates. J Org Chem 2013; 78:8712-21. [DOI: 10.1021/jo4014194] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Tao Wang
- Henan Key Laboratory of Chemical
Biology and Organic Chemistry, The College of Chemistry and Molecular
Engineering, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
| | - Xin-Qi Hao
- Henan Key Laboratory of Chemical
Biology and Organic Chemistry, The College of Chemistry and Molecular
Engineering, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
| | - Juan-Juan Huang
- Henan Key Laboratory of Chemical
Biology and Organic Chemistry, The College of Chemistry and Molecular
Engineering, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
| | - Jun-Long Niu
- Henan Key Laboratory of Chemical
Biology and Organic Chemistry, The College of Chemistry and Molecular
Engineering, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
| | - Jun-Fang Gong
- Henan Key Laboratory of Chemical
Biology and Organic Chemistry, The College of Chemistry and Molecular
Engineering, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
| | - Mao-Ping Song
- Henan Key Laboratory of Chemical
Biology and Organic Chemistry, The College of Chemistry and Molecular
Engineering, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
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14
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Abstract
Highly enantio- and diastereoselective transannular ketone-ene reactions are catalyzed by a new chromium(III) triflate tridentate Schiff base complex. Electronically unactivated keto-olefins undergo heteroene reactions at ambient temperature to afford enantioenriched bicyclic alcohols, common structural motifs in natural products. The kinetic resolution of a configurationally stable planar-chiral cyclodecenone is also described.
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Affiliation(s)
- Naomi S. Rajapaksa
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Eric N. Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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15
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Yin C, Cao W, Lin L, Liu X, Feng X. N,N′-Dioxide-Magnesium Ditriflate Complex-Catalyzed Asymmetric α-Hydroxylation of β-Keto Esters and β-Keto Amides. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300335] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Fandrick DR, Reeves JT, Bakonyi JM, Nyalapatla PR, Tan Z, Niemeier O, Akalay D, Fandrick KR, Wohlleben W, Ollenberger S, Song JJ, Sun X, Qu B, Haddad N, Sanyal S, Shen S, Ma S, Byrne D, Chitroda A, Fuchs V, Narayanan BA, Grinberg N, Lee H, Yee N, Brenner M, Senanayake CH. Zinc Catalyzed and Mediated Asymmetric Propargylation of Trifluoromethyl Ketones with a Propargyl Boronate. J Org Chem 2013; 78:3592-615. [DOI: 10.1021/jo400080y] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Daniel R. Fandrick
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Jonathan T. Reeves
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Johanna M. Bakonyi
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Prasanth R. Nyalapatla
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Zhulin Tan
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Oliver Niemeier
- Boehringer Ingelheim GmbH & Co KG, Binger Strasse 173, 55216 Ingelheim am Rhein, Germany
| | - Deniz Akalay
- Boehringer Ingelheim GmbH & Co KG, Binger Strasse 173, 55216 Ingelheim am Rhein, Germany
| | - Keith R. Fandrick
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Wolfgang Wohlleben
- Boehringer Ingelheim GmbH & Co KG, Binger Strasse 173, 55216 Ingelheim am Rhein, Germany
| | - Swetlana Ollenberger
- Boehringer Ingelheim GmbH & Co KG, Binger Strasse 173, 55216 Ingelheim am Rhein, Germany
| | - Jinhua J. Song
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Xiufeng Sun
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Bo Qu
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Nizar Haddad
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Sanjit Sanyal
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Sherry Shen
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Shengli Ma
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Denis Byrne
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Ashish Chitroda
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Victor Fuchs
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Bikshandarkoil A. Narayanan
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Nelu Grinberg
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Heewon Lee
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Nathan Yee
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
| | - Michael Brenner
- Boehringer Ingelheim GmbH & Co KG, Binger Strasse 173, 55216 Ingelheim am Rhein, Germany
| | - Chris H. Senanayake
- Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Ridgebury
Rd./PO BOX 368, Ridgefield, Connecticut 06877-0368, United States
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17
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Zheng K, Liu X, Qin S, Xie M, Lin L, Hu C, Feng X. Completely OH-Selective FeCl3-Catalyzed Prins Cyclization: Highly Stereoselective Synthesis of 4-OH-Tetrahydropyrans. J Am Chem Soc 2012; 134:17564-73. [DOI: 10.1021/ja3062002] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ke Zheng
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Song Qin
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Mingsheng Xie
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Lili Lin
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Changwei Hu
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
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18
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Rueping M, Bootwicha T, Kambutong S, Sugiono E. Asymmetric Calcium Catalysis: Highly Enantioselective Carbonyl-Ene and Friedel-Crafts Reactions for the Synthesis of Quaternary α-Hydroxy Esters Bearing a Trifluoromethyl Group. Chem Asian J 2012; 7:1195-8. [DOI: 10.1002/asia.201200063] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Indexed: 11/06/2022]
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19
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Huang SX, Ding K. Asymmetrische Bromaminierung von Chalkonen mit einem privilegierten N,N′-Dioxid/Scandium(III)-Katalysator. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201101076] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Huang SX, Ding K. Asymmetric Bromoamination of Chalcones with a Privileged N,N′-Dioxide/Scandium(III) Catalyst. Angew Chem Int Ed Engl 2011; 50:7734-6. [DOI: 10.1002/anie.201101076] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2011] [Indexed: 11/09/2022]
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21
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Zheng K, Yin C, Liu X, Lin L, Feng X. Catalytic Asymmetric Addition of Alkyl Enol Ethers to 1,2-Dicarbonyl Compounds: Highly Enantioselective Synthesis of Substituted 3-Alkyl-3-Hydroxyoxindoles. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201007145] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Zheng K, Yin C, Liu X, Lin L, Feng X. Catalytic Asymmetric Addition of Alkyl Enol Ethers to 1,2-Dicarbonyl Compounds: Highly Enantioselective Synthesis of Substituted 3-Alkyl-3-Hydroxyoxindoles. Angew Chem Int Ed Engl 2011; 50:2573-7. [DOI: 10.1002/anie.201007145] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2010] [Indexed: 11/08/2022]
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