101
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Yu JS, Zhou J. A highly efficient Mukaiyama–Mannich reaction of N-Boc isatin ketimines and other active cyclic ketimines using difluoroenol silyl ethers catalyzed by Ph3PAuOTf. Org Biomol Chem 2015; 13:10968-72. [DOI: 10.1039/c5ob01895a] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Ph3PAuOTf catalyzed highly efficient reaction of difluoroenoxysilanes and active ketimines is reported, which represents the first Au(i)-catalyzed Mukaiyama–Mannich reaction.
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Affiliation(s)
- Jin-Sheng Yu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- China
| | - Jian Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- China
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102
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kumari P, Barik S, Khan NH, Ganguly B, Kureshy RI, Abdi SHR, Bajaj HC. The origin for highly enantioselective induction of 1-naphthol to isatin-derived N-Boc ketimines catalyzed by quinine thiourea catalyst: an experimental and computational study. RSC Adv 2015. [DOI: 10.1039/c5ra12795e] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An enantioselective aza-Friedel–Crafts reaction of 1-naphthol with isatin derived N-Boc ketimines by cinchona based bifunctional thiourea as organo-catalyst is reported.
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Affiliation(s)
- Prathibha kumari
- Division of Inorganic Materials and Catalysis
- CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI)
- Council of Scientific & Industrial Research (CSIR)
- Bhavnagar
- India
| | - Sunirmal Barik
- Academy of Scientific and Innovative Research (AcSIR)
- (CSIR-CSMCRI)
- Bhavnagar
- India
- Analytical Discipline and Centralised Instrumental Facility
| | - Noorul H. Khan
- Division of Inorganic Materials and Catalysis
- CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI)
- Council of Scientific & Industrial Research (CSIR)
- Bhavnagar
- India
| | - Bishwajit Ganguly
- Academy of Scientific and Innovative Research (AcSIR)
- (CSIR-CSMCRI)
- Bhavnagar
- India
- Analytical Discipline and Centralised Instrumental Facility
| | - Rukhsana I. Kureshy
- Division of Inorganic Materials and Catalysis
- CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI)
- Council of Scientific & Industrial Research (CSIR)
- Bhavnagar
- India
| | - Sayed H. R. Abdi
- Division of Inorganic Materials and Catalysis
- CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI)
- Council of Scientific & Industrial Research (CSIR)
- Bhavnagar
- India
| | - H. C. Bajaj
- Division of Inorganic Materials and Catalysis
- CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI)
- Council of Scientific & Industrial Research (CSIR)
- Bhavnagar
- India
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103
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Wang T, Xiong J, Wang W, Li R, Tang X, Xiong F. Tunable regioselective synthesis of pyrazolo[3,4-d]pyrimidine derivatives via aza-Wittig cyclization and dimroth-type rearrangement. RSC Adv 2015. [DOI: 10.1039/c4ra15777j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel tunable regioselective synthesis of pyrazolo[3,4-d]pyrimidine derivatives via aza-Wittig/Ag(i) or base-promoted tandem reaction has been developed. This approach provides a concise way to construct this derivatives under mild condition.
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Affiliation(s)
- Tao Wang
- National Research Center for Carbohydrate Synthesis and Key Laboratory of Chemical Biology
- Nanchang 330022
- P. R. China
- College of Chemistry and Chemical Engineering
- Jiangxi Normal University
| | - Jun Xiong
- National Research Center for Carbohydrate Synthesis and Key Laboratory of Chemical Biology
- Nanchang 330022
- P. R. China
| | - Wenjuan Wang
- National Research Center for Carbohydrate Synthesis and Key Laboratory of Chemical Biology
- Nanchang 330022
- P. R. China
| | - Rou Li
- National Research Center for Carbohydrate Synthesis and Key Laboratory of Chemical Biology
- Nanchang 330022
- P. R. China
| | - Xiaoli Tang
- National Research Center for Carbohydrate Synthesis and Key Laboratory of Chemical Biology
- Nanchang 330022
- P. R. China
| | - Fei Xiong
- National Research Center for Carbohydrate Synthesis and Key Laboratory of Chemical Biology
- Nanchang 330022
- P. R. China
- College of Chemistry and Chemical Engineering
- Jiangxi Normal University
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104
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Ma M, Zhu Y, Sun Q, Li X, Su J, Zhao L, Zhao Y, Qiu S, Yan W, Wang K, Wang R. The asymmetric synthesis of CF3-containing spiro[pyrrolidin-3,2′-oxindole] through the organocatalytic 1,3-dipolar cycloaddition reaction. Chem Commun (Camb) 2015; 51:8789-92. [DOI: 10.1039/c4cc10216a] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A new strategy for the construction of optically active 5′-CF3 spiro[pyrrolidin-3,2′-oxindole] was described by using CF3CH2NH2 as a building block.
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105
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Kaur J, Chimni SS, Mahajan S, Kumar A. Stereoselective synthesis of 3-amino-2-oxindoles from isatin imines: new scaffolds for bioactivity evaluation. RSC Adv 2015. [DOI: 10.1039/c5ra06969f] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
3-Substituted-3-aminooxindole motifs constitute the core structure of a number of natural products and drug candidates.
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Affiliation(s)
- Jasneet Kaur
- Department of Chemistry
- U.G.C. Centre of Advance Studies in Chemistry
- Guru Nanak Dev University
- Amritsar
- India
| | - Swapandeep Singh Chimni
- Department of Chemistry
- U.G.C. Centre of Advance Studies in Chemistry
- Guru Nanak Dev University
- Amritsar
- India
| | - Suhel Mahajan
- Department of Chemistry
- U.G.C. Centre of Advance Studies in Chemistry
- Guru Nanak Dev University
- Amritsar
- India
| | - Akshay Kumar
- Department of Chemistry
- DAV University
- Jalandhar
- India
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106
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Chen JP, Chen WW, Li Y, Xu MH. A highly diastereoselective Friedel–Crafts reaction of indoles with isatin-derived N-sulfinyl ketimines towards the efficient synthesis of chiral tetrasubstituted 3-indolyl-3-aminooxindoles. Org Biomol Chem 2015; 13:3363-70. [DOI: 10.1039/c5ob00063g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A Lewis acid promoted highly diastereoselective asymmetric Friedel–Crafts alkylation of indoles with isatin-derived N-tert-butanesulfinyl ketimines is described.
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Affiliation(s)
- Jian-Ping Chen
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Wen-Wen Chen
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Yi Li
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Ming-Hua Xu
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
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107
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Nakamura S, Takahashi S, Nakane D, Masuda H. Organocatalytic Enantioselective Addition of Thiols to Ketimines Derived from Isatins. Org Lett 2014; 17:106-9. [DOI: 10.1021/ol503309s] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Shuichi Nakamura
- Department of Frontier Materials,
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Shun Takahashi
- Department of Frontier Materials,
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Daisuke Nakane
- Department of Frontier Materials,
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Hideki Masuda
- Department of Frontier Materials,
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
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108
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Zhao J, Fang B, Luo W, Hao X, Liu X, Lin L, Feng X. Enantioselective Construction of Vicinal Tetrasubstituted Stereocenters by the Mannich Reaction of Silyl Ketene Imines with Isatin‐Derived Ketimines. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408730] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jiannan Zhao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Bing Fang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Weiwei Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Xiaoyu Hao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin (China)
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109
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Zhao J, Fang B, Luo W, Hao X, Liu X, Lin L, Feng X. Enantioselective Construction of Vicinal Tetrasubstituted Stereocenters by the Mannich Reaction of Silyl Ketene Imines with Isatin‐Derived Ketimines. Angew Chem Int Ed Engl 2014; 54:241-4. [DOI: 10.1002/anie.201408730] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 10/05/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Jiannan Zhao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Bing Fang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Weiwei Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Xiaoyu Hao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 (China)
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin (China)
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110
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George J, Sridhar B, Reddy BVS. First example of quinine-squaramide catalyzed enantioselective addition of diphenyl phosphite to ketimines derived from isatins. Org Biomol Chem 2014; 12:1595-602. [PMID: 24469542 DOI: 10.1039/c3ob42026d] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A highly enantioselective addition of diphenyl phosphite to ketimines derived from isatins has been achieved using a bifunctional organocatalyst, quinine-derived squaramide catalyst. This method works efficiently with several ketimines to produce the corresponding 3-amino-2-oxoindolin-3-yl-phosphonates in excellent yields with high enantioselectivity (up to 98% ee).
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Affiliation(s)
- Jimil George
- Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, India.
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111
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Ghosh D, Saravanan S, Gupta N, Abdi SHR, Khan NUH, Kureshy RI, Bajaj HC. Phosphotungstic Acid as an Efficient Catalyst for Allylation of Isatins andN-tert-Butyloxycarbonylamido Sulfones Under Solvent-Free Conditions. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201402130] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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112
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Cinchona-derived thiourea catalyzed hydrophosphonylation of ketimines—an enantioselective synthesis of α-amino phosphonates. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.06.013] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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113
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Zhao X, Li TZ, Qian JY, Sha F, Wu XY. Enantioselective aza-Morita–Baylis–Hillman reaction between acrylates and N-Boc isatin ketimines: asymmetric construction of chiral 3-substituted-3-aminooxindoles. Org Biomol Chem 2014; 12:8072-8. [DOI: 10.1039/c4ob01358a] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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114
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Liu YC, Zhang R, Wu QY, Chen Q, Yang GF. Recent Developments in the Synthesis and Applications of Isatins. ORG PREP PROCED INT 2014. [DOI: 10.1080/00304948.2014.922378] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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115
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Hayashi M, Iwanaga M, Shiomi N, Nakane D, Masuda H, Nakamura S. Direct Asymmetric Mannich-Type Reaction of α-Isocyanoacetates with Ketimines using Cinchona Alkaloid/Copper(II) Catalysts. Angew Chem Int Ed Engl 2014; 53:8411-5. [DOI: 10.1002/anie.201404629] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Indexed: 11/08/2022]
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116
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Hayashi M, Iwanaga M, Shiomi N, Nakane D, Masuda H, Nakamura S. Direct Asymmetric Mannich-Type Reaction of α-Isocyanoacetates with Ketimines using Cinchona Alkaloid/Copper(II) Catalysts. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201404629] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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117
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Lesma G, Meneghetti F, Sacchetti A, Stucchi M, Silvani A. Asymmetric Ugi 3CR on isatin-derived ketimine: synthesis of chiral 3,3-disubstituted 3-aminooxindole derivatives. Beilstein J Org Chem 2014; 10:1383-9. [PMID: 24991292 PMCID: PMC4077467 DOI: 10.3762/bjoc.10.141] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Accepted: 05/19/2014] [Indexed: 12/23/2022] Open
Abstract
An efficient Ugi three-component reaction of a preformed chiral ketimine derived from isatin with various isonitrile and acid components has been developed. The reactions proceeded smoothly and in a stereocontrolled manner with regard to the new center of the Ugi products due to the stereoinduction of the amine chiral residue. A wide variety of novel chiral 3,3-disubstituted 3-aminooxindoles were obtained, a selection of which were subjected to post-Ugi transformations, paving the way to application as peptidomimetics.
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Affiliation(s)
- Giordano Lesma
- Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi, 19, 20133 Milano (Italy)
| | - Fiorella Meneghetti
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via L. Mangiagalli 25, 20133 Milano, Italy
| | - Alessandro Sacchetti
- Dipartimento di Chimica, Materiali e Ingegneria Chimica 'Giulio Natta', Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, Italy
| | - Mattia Stucchi
- Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi, 19, 20133 Milano (Italy)
| | - Alessandra Silvani
- Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi, 19, 20133 Milano (Italy)
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118
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Li TZ, Wang XB, Sha F, Wu XY. Organocatalyzed Enantioselective Mannich Reaction of Pyrazoleamides with Isatin-Derived Ketimines. J Org Chem 2014; 79:4332-9. [DOI: 10.1021/jo500145w] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Tian-Ze Li
- Key Laboratory for Advanced
Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, PR China
| | - Xi-Bo Wang
- Key Laboratory for Advanced
Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, PR China
| | - Feng Sha
- Key Laboratory for Advanced
Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, PR China
| | - Xin-Yan Wu
- Key Laboratory for Advanced
Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, PR China
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119
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Arai T, Matsumura E, Masu H. Bis(imidazolidine)pyridine-NiCl2 Catalyst for nitro-Mannich reaction of isatin-derived N-Boc ketimines: asymmetric synthesis of chiral 3-substituted 3-amino-2-oxindoles. Org Lett 2014; 16:2768-71. [PMID: 24773141 DOI: 10.1021/ol501085y] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
An (S,S)-diphenyldiamine-derived bis(imidazolidine)pyridine (PyBidine)-NiCl2 complex catalyzed the nitro-Mannich reaction of isatin-derived N-Boc ketimines to construct a chiral quaternary aminocarbon center at the C3 position of oxindoles in yields of up to 99% with 95% ee.
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Affiliation(s)
- Takayoshi Arai
- Department of Chemistry, Graduate School of Science, Chiba University , 1-33 Yayoi, Inage, Chiba 263-8522, Japan
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120
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Cao ZY, Wang YH, Zeng XP, Zhou J. Catalytic asymmetric synthesis of 3,3-disubstituted oxindoles: diazooxindole joins the field. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.01.084] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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121
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Wu C, Li G, Sun W, Zhang M, Hong L, Wang R. Organocatalytic Highly Enantioselective Monofluoroalkylation of 3-Bromooxindoles: Construction of Fluorinated 3,3′-Disubstituted Oxindoles and Their Derivatives. Org Lett 2014; 16:1960-3. [DOI: 10.1021/ol500517d] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Chongyang Wu
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, P.R. China
| | - Guofeng Li
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, P.R. China
| | - Wangsheng Sun
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, P.R. China
| | - Ming Zhang
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, P.R. China
| | - Liang Hong
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, P.R. China
| | - Rui Wang
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, P.R. China
- State
Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou
Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P.R. China
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122
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Rajasekaran T, Karthik G, Sridhar B, Kumar SK, Reddy BVS. Highly Diastereoselective Reaction of α-Diazoesters with Aryl Alcohols and Isatin Imines: Rapid Access to Oxindole-Derived α-Alkoxy-β-amino Acid Derivatives with Two Adjacent Quaternary Carbon Centers. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301775] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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123
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Wang YH, Liu YL, Cao ZY, Zhou J. An Organocatalytic Addition of Nitromethane to Activated Ketimines. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201300289] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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124
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Ortín I, Dixon DJ. Direct Catalytic Enantio- and Diastereoselective Mannich Reaction of Isocyanoacetates and Ketimines. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309719] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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125
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Direct Catalytic Enantio- and Diastereoselective Mannich Reaction of Isocyanoacetates and Ketimines. Angew Chem Int Ed Engl 2014; 53:3462-5. [DOI: 10.1002/anie.201309719] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Indexed: 11/07/2022]
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126
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Rao VUB, Jadhav AP, Garad D, Singh RP. Asymmetric Vinylogous Mannich Reaction of Silyloxy Furans with N-tert-Butanesulfinyl Ketimines. Org Lett 2014; 16:648-51. [DOI: 10.1021/ol4037117] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- V. U. Bhaskara Rao
- Division of Organic Chemistry, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, India 411008
| | - Amol P. Jadhav
- Division of Organic Chemistry, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, India 411008
| | - Dnyaneshwar Garad
- Division of Organic Chemistry, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, India 411008
| | - Ravi P. Singh
- Division of Organic Chemistry, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, India 411008
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127
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Ranieri B, Sartori A, Curti C, Battistini L, Rassu G, Pelosi G, Casiraghi G, Zanardi F. 3-Alkenyl-2-silyloxyindoles in Vinylogous Mannich Reactions: Synthesis of Aminated Indole-Based Scaffolds and Products. Org Lett 2014; 16:932-5. [DOI: 10.1021/ol4036598] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Beatrice Ranieri
- Dipartimento
di Farmacia, Università degli Studi di Parma, Parco Area
delle Scienze 27A, I-43124 Parma, Italy
| | - Andrea Sartori
- Dipartimento
di Farmacia, Università degli Studi di Parma, Parco Area
delle Scienze 27A, I-43124 Parma, Italy
| | - Claudio Curti
- Dipartimento
di Farmacia, Università degli Studi di Parma, Parco Area
delle Scienze 27A, I-43124 Parma, Italy
| | - Lucia Battistini
- Dipartimento
di Farmacia, Università degli Studi di Parma, Parco Area
delle Scienze 27A, I-43124 Parma, Italy
| | - Gloria Rassu
- Istituto di Chimica
Biomolecolare del CNR, Traversa La
Crucca 3, I-07100 Li Punti Sassari, Italy
| | - Giorgio Pelosi
- Dipartimento
di Chimica, Università degli Studi di Parma, Parco Area
delle Scienze 17A, I-43124 Parma, Italy
| | - Giovanni Casiraghi
- Dipartimento
di Farmacia, Università degli Studi di Parma, Parco Area
delle Scienze 27A, I-43124 Parma, Italy
| | - Franca Zanardi
- Dipartimento
di Farmacia, Università degli Studi di Parma, Parco Area
delle Scienze 27A, I-43124 Parma, Italy
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128
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Guo Y, Zhang Y, Qi L, Tian F, Wang L. Organocatalytic direct asymmetric vinylogous Mannich reaction of γ-butenolides with isatin-derived ketimines. RSC Adv 2014. [DOI: 10.1039/c4ra04824e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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129
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Kano T, Takechi R, Kobayashi R, Maruoka K. Chiral Brønsted acid-catalyzed enantioselective addition of indoles to ketimines. Org Biomol Chem 2014; 12:724-7. [DOI: 10.1039/c3ob42190b] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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130
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Wang XB, Li TZ, Sha F, Wu XY. Enantioselective Squaramide-Catalysed Domino Mannich-Cyclization Reaction of Isatin Imines. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301350] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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131
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Maity P, Pemberton RP, Tantillo DJ, Tambar UK. Brønsted Acid Catalyzed Enantioselective Indole Aza-Claisen Rearrangement Mediated by an Arene CH–O Interaction. J Am Chem Soc 2013; 135:16380-3. [DOI: 10.1021/ja4095473] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pradip Maity
- Department
of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, United States
| | - Ryan P. Pemberton
- Department
of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Dean J. Tantillo
- Department
of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Uttam K. Tambar
- Department
of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, United States
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132
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Kano T, Yurino T, Maruoka K. Organocatalytic Asymmetric Synthesis of Propargylamines with Two Adjacent Stereocenters: Mannich-Type Reactions of In Situ Generated C-Alkynyl Imines with β-Keto Esters. Angew Chem Int Ed Engl 2013; 52:11509-12. [DOI: 10.1002/anie.201304963] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/31/2013] [Indexed: 11/08/2022]
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133
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Kano T, Yurino T, Maruoka K. Organocatalytic Asymmetric Synthesis of Propargylamines with Two Adjacent Stereocenters: Mannich-Type Reactions of In Situ Generated C-Alkynyl Imines with β-Keto Esters. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304963] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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134
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Li TZ, Wang XB, Sha F, Wu XY. Catalytic enantioselective addition of alcohols to isatin-derived N-Boc ketimines. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.06.076] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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135
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Cui BD, Han WY, Wu ZJ, Zhang XM, Yuan WC. Enantioselective Synthesis of Quaternary 3-Aminooxindoles via Organocatalytic Asymmetric Michael Addition of 3-Monosubstituted 3-Aminooxindoles to Nitroolefins. J Org Chem 2013; 78:8833-9. [DOI: 10.1021/jo401154b] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Bao-Dong Cui
- National Engineering
Research
Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu
610041, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wen-Yong Han
- National Engineering
Research
Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu
610041, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Jun Wu
- Chengdu Institute
of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Xiao-Mei Zhang
- National Engineering
Research
Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu
610041, China
| | - Wei-Cheng Yuan
- National Engineering
Research
Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu
610041, China
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136
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Takizawa S, Arteaga FA, Yoshida Y, Suzuki M, Sasai H. Organocatalyzed Formal [2 + 2] Cycloaddition of Ketimines with Allenoates: Facile Access to Azetidines with a Chiral Tetrasubstituted Carbon Stereogenic Center. Org Lett 2013; 15:4142-5. [DOI: 10.1021/ol401817q] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Shinobu Takizawa
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Fernando Arteaga Arteaga
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Yasushi Yoshida
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Michitaka Suzuki
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Hiroaki Sasai
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
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137
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Sankar MG, Garcia-Castro M, Wang Y, Kumar K. A Facile Dipolar Entry to Diverse Dihydro-1 H-1,2,4-Triazoles. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300120] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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138
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Miyoshi T, Matsuya S, Tsugawa M, Sato S, Ueda M, Miyata O. Sequential Retro-Ene Arylation Reaction of N-Alkoxyenamides for the Synthesis of tert-Alkylamines. Org Lett 2013; 15:3374-7. [DOI: 10.1021/ol4014238] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tetsuya Miyoshi
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Syota Matsuya
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Mikako Tsugawa
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Shohei Sato
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Masafumi Ueda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Okiko Miyata
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
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139
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Shupe BH, Allen EE, MacDonald JP, Wilson SO, Franz AK. Synthesis of Spirocarbamate Oxindoles via Intramolecular Trapping of a β-Silyl Carbocation by an N-Boc Group. Org Lett 2013; 15:3218-21. [DOI: 10.1021/ol4010867] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Benjamin H. Shupe
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Emily E. Allen
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Jacob P. MacDonald
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Sean O. Wilson
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Annaliese K. Franz
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
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140
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Yao Y, Li JL, Zhou QQ, Dong L, Chen YC. Enantioselective aza-Morita-Baylis-Hillman reaction with ketimines and acrolein catalyzed by organic assemblies. Chemistry 2013; 19:9447-51. [PMID: 23740616 DOI: 10.1002/chem.201301558] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Indexed: 02/05/2023]
Affiliation(s)
- Yuan Yao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
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141
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Yin L, Takada H, Kumagai N, Shibasaki M. Direct Catalytic Asymmetric Vinylogous Mannich-Type Reaction of γ-Butenolides with Ketimines. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303119] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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142
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Yin L, Takada H, Kumagai N, Shibasaki M. Direct Catalytic Asymmetric Vinylogous Mannich-Type Reaction of γ-Butenolides with Ketimines. Angew Chem Int Ed Engl 2013; 52:7310-3. [DOI: 10.1002/anie.201303119] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Indexed: 11/09/2022]
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143
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Nakamura S, Hyodo K, Nakamura M, Nakane D, Masuda H. Catalytic Enantioselective Allylation of Ketimines by Using Palladium Pincer Complexes with Chiral Bis(imidazoline)s. Chemistry 2013; 19:7304-9. [DOI: 10.1002/chem.201300685] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Indexed: 11/05/2022]
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144
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Mohammadi S, Heiran R, Herrera RP, Marqués-López E. Isatin as a Strategic Motif for Asymmetric Catalysis. ChemCatChem 2013. [DOI: 10.1002/cctc.201300050] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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145
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Hayashi M, Sano M, Funahashi Y, Nakamura S. Cinchona Alkaloid Amide/Copper(II) Catalyzed Diastereo- and Enantioselective Vinylogous Mannich Reaction of Ketimines with Siloxyfurans. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301917] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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146
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Hayashi M, Sano M, Funahashi Y, Nakamura S. Cinchona Alkaloid Amide/Copper(II) Catalyzed Diastereo- and Enantioselective Vinylogous Mannich Reaction of Ketimines with Siloxyfurans. Angew Chem Int Ed Engl 2013; 52:5557-60. [DOI: 10.1002/anie.201301917] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Indexed: 11/05/2022]
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147
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Chen X, Chen H, Ji X, Jiang H, Yao ZJ, Liu H. Asymmetric One-Pot Sequential Mannich/Hydroamination Reaction by Organo- and Gold Catalysts: Synthesis of Spiro[pyrrolidin-3,2′-oxindole] Derivatives. Org Lett 2013; 15:1846-9. [DOI: 10.1021/ol4004542] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xianjie Chen
- School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, 22 Hankou Road, Nanjing 210093, P. R. China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai, P. R. China
| | - Hui Chen
- School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, 22 Hankou Road, Nanjing 210093, P. R. China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai, P. R. China
| | - Xun Ji
- School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, 22 Hankou Road, Nanjing 210093, P. R. China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai, P. R. China
| | - Hualiang Jiang
- School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, 22 Hankou Road, Nanjing 210093, P. R. China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai, P. R. China
| | - Zhu-Jun Yao
- School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, 22 Hankou Road, Nanjing 210093, P. R. China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai, P. R. China
| | - Hong Liu
- School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, 22 Hankou Road, Nanjing 210093, P. R. China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai, P. R. China
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148
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Chauhan P, Chimni SS. Organocatalytic asymmetric synthesis of 3-amino-2-oxindole derivatives bearing a tetra-substituted stereocenter. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.03.002] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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149
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Hu FL, Wei Y, Shi M, Pindi S, Li G. Asymmetric catalytic aza-Morita-Baylis-Hillman reaction for the synthesis of 3-substituted-3-aminooxindoles with chiral quaternary carbon centers. Org Biomol Chem 2013; 11:1921-4. [PMID: 23407608 DOI: 10.1039/c3ob27495k] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The asymmetric catalytic aza-Morita-Baylis-Hillman (aza-MBH) reaction of isatin-derived ketimines with MVK has been established by using chiral amino and phosphino catalysts. The reaction resulted in biomedically important 3-substituted 3-amino-2-oxindoles in good yields (>80% for most cases) and with excellent enantioselectivity (90-99% ee). Twenty-eight cases assembled with chiral quaternary stereogenic centers have been examined under convenient systems.
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Affiliation(s)
- Fang-Le Hu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Mei Long Road, Shanghai 200237, PR China
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150
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Ren L, Lian X, Gong L. Brønsted Acid/Rhodium(II) Cooperative Catalytic Asymmetric Three‐Component Aldol‐Type Reaction for the Synthesis of 3‐Amino Oxindoles. Chemistry 2013; 19:3315-8. [DOI: 10.1002/chem.201203993] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Lei Ren
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026 (P.R. China), Fax: (+86) 551‐360‐6266
| | - Xiao‐Lei Lian
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026 (P.R. China), Fax: (+86) 551‐360‐6266
| | - Liu‐Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026 (P.R. China), Fax: (+86) 551‐360‐6266
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