1
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Liu W, Zhang L, Liao X, Chen J, Huang Y. An NHC-Catalyzed [3+2] Cyclization of β-Disubstituted Enals with Benzoyl Cyanides. Chem Commun (Camb) 2022; 58:9742-9745. [DOI: 10.1039/d2cc04025e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The NHC-catalyzed asymmetric [3+2] cyclization of benzoyl cyanides to homoenolate generated in-situ from enals was reported. This methodology leads to the efficient construction of a series of chiral cyclic compounds...
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2
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Wang X, Liu Y, Wei J, Chen L, Li Y. Asymmetric Synthesis of α‐Amino Acids Bearing a 3‐Alkyloxindole Structural Motif. ChemistrySelect 2021. [DOI: 10.1002/slct.202102857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xiao‐Ping Wang
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 China
| | - Yong‐Liang Liu
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 China
| | - Jie Wei
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 China
| | - Ling‐Yan Chen
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 China
| | - Ya Li
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 China
- Shanghai Frontiers Science Research Center for Druggability of Cardiovascular noncoding RNA Institute for Frontier Medical Technology Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 China
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3
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Dobah F, Mazodze CM, Petersen WF. Cross-Dehydrogenative Cyclization-Dimerization Cascade Sequence for the Synthesis of Symmetrical 3,3'-Bisoxindoles. Org Lett 2021; 23:5466-5470. [PMID: 34232674 DOI: 10.1021/acs.orglett.1c01799] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The synthesis of symmetrical 3,3'-bisoxindoles from simple acyclic β-oxoanilides is reported. The described method forges three new C-C bonds in a single step via a sequential Mn(OAc)3·2H2O mediated oxidative radical cyclization-fragmentation-dimerization process. The scope of this reaction is demonstrated in the preparation of a variety of 3,3'-bisoxindoles, as well as its application toward the formal synthesis of the Calycanthaceae alkaloid, (±)-folicanthine.
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Affiliation(s)
- Farhaan Dobah
- Department of Chemistry, University of Cape Town, Rondebosch, Cape Town, 7700, South Africa
| | - C Munashe Mazodze
- Department of Chemistry, University of Cape Town, Rondebosch, Cape Town, 7700, South Africa
| | - Wade F Petersen
- Department of Chemistry, University of Cape Town, Rondebosch, Cape Town, 7700, South Africa
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4
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Fujita K, Miura M, Funahashi Y, Hatanaka T, Nakamura S. Enantioselective Reaction of 2 H-Azirines with Oxazol-5-(4 H)-ones Catalyzed by Cinchona Alkaloid Sulfonamide Catalysts. Org Lett 2021; 23:2104-2108. [PMID: 33650878 DOI: 10.1021/acs.orglett.1c00259] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The enantioselective reaction of 2H-azirines with oxazol-5-(4H)-ones (oxazolones) using a cinchona alkaloid sulfonamide catalyst has been developed. The reaction proceeded at the C-2 position of oxazolones to afford products with consecutive tetrasubstituted stereogenic centers in high yield with high diastereo- and enantioselectivity. The obtained aziridines were converted into various chiral compounds without loss of enantiopurity.
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Affiliation(s)
- Kazuki Fujita
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Masataka Miura
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Yasuhiro Funahashi
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Tsubasa Hatanaka
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Shuichi Nakamura
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan.,Frontier Research Institute for Material Science, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
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5
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Chen GS, Fang YB, Ren Z, Tian X, Liu YL. Reaction condition-dependent divergent synthesis of spirooxindoles and bisoxindoles. Org Chem Front 2021. [DOI: 10.1039/d1qo00575h] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
DABCO-catalyzed divergent transformations of isatin-derived MBH carbonates leading to either spirocyclopentene oxindoles, spirocyclopentadiene 2-oxindoles or bisoxindoles are described.
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Affiliation(s)
- Guo-Shu Chen
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou
- China
| | - Yu-Bo Fang
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou
- China
| | - Zhi Ren
- College of Pharmacy
- Shenzhen Technology University
- Shenzhen
- China
| | - Xu Tian
- School of Pharmacy
- Guangzhou Medical University
- Guangzhou
- China
| | - Yun-Lin Liu
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou
- China
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6
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Homma C, Takeshima A, Kano T, Maruoka K. Construction of chiral α- tert-amine scaffolds via amine-catalyzed asymmetric Mannich reactions of alkyl-substituted ketimines. Chem Sci 2020; 12:1445-1450. [PMID: 34163907 PMCID: PMC8179053 DOI: 10.1039/d0sc05269h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Stereoselective Mannich reactions of aldehydes with ketimines provide chiral β-amino aldehydes that bear an α-tert-amine moiety. However, the structural variation of the ketimines is limited due to the formation of inseparable E/Z isomers, low reactivity, and other synthetic difficulties. In this study, a highly diastereodivergent synthesis of hitherto difficult-to-access β-amino aldehydes that bear a chiral α-tert-amine moiety was achieved using the amine-catalyzed Mannich reactions of aldehydes with less-activated Z-ketimines that bear both alkyl and alkynyl groups.
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Affiliation(s)
- Chihiro Homma
- Department of Chemistry, Graduate School of Science, Kyoto University Sakyo Kyoto 606-8502 Japan
| | - Aika Takeshima
- Department of Chemistry, Graduate School of Science, Kyoto University Sakyo Kyoto 606-8502 Japan
| | - Taichi Kano
- Department of Chemistry, Graduate School of Science, Kyoto University Sakyo Kyoto 606-8502 Japan
| | - Keiji Maruoka
- Graduate School of Science, Graduate School of Pharmaceutical Sciences, Kyoto University Kyoto 606-8502 Japan .,School of Chemical Engineering and Light Industry, Guangdong University of Technology Guangzhou 510006 China
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7
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Li G, Liu M, Zou S, Feng X, Lin L. A Bispidine-Based Chiral Amine Catalyst for Asymmetric Mannich Reaction of Ketones with Isatin Ketimines. Org Lett 2020; 22:8708-8713. [PMID: 33074003 DOI: 10.1021/acs.orglett.0c03305] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A unique chiral amine organocatalyst with a bispidine structure was found to be efficient for the diastereo- and enantioselective Mannich reaction of isatin ketimines with ketones. A series of 3-substituted 3-amino-2-oxindoles bearing vicinal tertiary and quaternary chiral stereogenic centers were obtained in excellent yields with excellent dr and ee values. The gram-scale synthesis and transformation of the product showed the practicability of this methodology. In addition, a possible transition state model was proposed to explain the origin of the stereoselectivity.
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Affiliation(s)
- Gonglin Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Mohuizi Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Sijia Zou
- 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
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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8
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Morisaki K, Morimoto H, Ohshima T. Recent Progress on Catalytic Addition Reactions to N-Unsubstituted Imines. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01212] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Kazuhiro Morisaki
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
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9
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Huffman BJ, Chen S, Schwarz JL, Plata RE, Chin EN, Lairson LL, Houk KN, Shenvi RA. Electronic complementarity permits hindered butenolide heterodimerization and discovery of novel cGAS/STING pathway antagonists. Nat Chem 2020; 12:310-317. [PMID: 32042135 DOI: 10.1038/s41557-019-0413-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 12/13/2019] [Indexed: 01/03/2023]
Abstract
sp3-hybridized attached-rings are common motifs in secondary metabolites and represent tetrahedral equivalents to the biaryl substructures that overpopulate synthetic libraries. Few methods are available that can link fully substituted carbon atoms of two rings with stereocontrol. Here we have developed a stereoselective, heteroselective butenolide coupling that exhibits an unusually fast rate of C-C bond formation driven by exquisite complementarity of the reacting π systems. Heterodimerization generates a compound collection with topological complexity and diverse principal moments of inertia. The special status of the sp3-sp3 attached-ring motif is demonstrated in a high-throughput screen for inhibitors of the cyclic GMP-AMP synthase/stimulator of interferon genes pathway, which recruited these butenolide heterodimers from a field of 250,000 compounds. The driving forces underlying this general attached-ring coupling identify a novel paradigm for the accession of wider natural product chemical space, accelerating the discovery of selective lead compounds.
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Affiliation(s)
| | - Shuming Chen
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - J Luca Schwarz
- Department of Chemistry, Scripps Research, La Jolla, CA, USA
| | - R Erik Plata
- Department of Chemistry, Scripps Research, La Jolla, CA, USA
| | - Emily N Chin
- Department of Chemistry, Scripps Research, La Jolla, CA, USA
| | - Luke L Lairson
- Department of Chemistry, Scripps Research, La Jolla, CA, USA.
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
| | - Ryan A Shenvi
- Department of Chemistry, Scripps Research, La Jolla, CA, USA.
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10
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Zha T, Tong X, Deng Y, Peng F, Shao Z. Catalytic Asymmetric and Divergent Synthesis of Tricyclic and Tetracyclic Spirooxindoles: Controllable Site-Selective Electrophilic Halocyclization of 1,6-Enynes. Org Lett 2019; 21:6068-6073. [PMID: 31318558 DOI: 10.1021/acs.orglett.9b02202] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Catalytic asymmetric and divergent assembly of tricyclic and tetracyclic 3,3'-pyrrolidonyl spirooxindoles was developed, involving a one-pot chiral Brønsted base catalyzed asymmetric propargylation for the synthesis of oxindole 1,6-enynes and a subsequent switchable site-selective and highly diastereoselective electrophilic iodocyclization of 1,6-enynes. In addition, antitumor properties of the newly synthesized compounds were evaluated.
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Affiliation(s)
- Taochun Zha
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China
| | - Xinyu Tong
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China
| | - Yuhua Deng
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China
| | - Fangzhi Peng
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China
| | - Zhihui Shao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China
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11
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Tong P, Li Y, Zhang Y, Jiang X. Triphenylphosphine‐Catalyzed Diastereoselective Addition of Oxazolones to Isatin‐Derived Ketimines: Construction of Vicinal N‐Substituted Quaternary Stereocenters. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900107] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Pei Tong
- State Key Laboratory of Applied Organic ChemistryCollege of Chemistry and Chemical EngineeringLanzhou University Lanzhou 730000 P. R. China
| | - Ying Li
- State Key Laboratory of Applied Organic ChemistryCollege of Chemistry and Chemical EngineeringLanzhou University Lanzhou 730000 P. R. China
| | - Yuan Zhang
- State Key Laboratory of Applied Organic ChemistryCollege of Chemistry and Chemical EngineeringLanzhou University Lanzhou 730000 P. R. China
| | - Xianxing Jiang
- School of Pharmaceutical SciencesSun Yat-sen University Guangzhou 510006 P. R. China
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12
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Jiang Y, Yu SW, Yang Y, Liu YL, Xu XY, Zhang XM, Yuan WC. Synthesis of polycyclic spirooxindoles via an asymmetric catalytic one-pot stepwise Aldol/chloroetherification/aromatization procedure. Org Biomol Chem 2019; 16:6647-6651. [PMID: 30179248 DOI: 10.1039/c8ob01713a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A general method for the synthesis of chiral pentacyclic spirooxindoles containing a tetrahydropyrano[2,3-b]indole scaffold through a one-pot stepwise sequence from 3-(3-indolomethyl)oxindole, paraformaldehyde and NCS is reported. Furthermore, the pentacyclic spirooxindoles could be transformed to bispirooxindole and other structurally diverse spirocyclic oxindoles.
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Affiliation(s)
- Yan Jiang
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong 643000, China.
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13
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Zheng BQ, Chen LY, Zhao JB, Ji J, Qiu ZB, Ren X, Li Y. Organocatalytic asymmetric syntheses of 3-fluorooxindoles containing vicinal fluoroamine motifs. Org Biomol Chem 2019; 16:8989-8993. [PMID: 30418465 DOI: 10.1039/c8ob01786g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An organocatalytic Mannich reaction of 3-fluorooxindoles has been developed. Using a commercially available cinchona alkaloid catalyst, a wide range of 3-fluorooxindoles was successfully reacted with N-sulfonyl aldimines to give biologically important 3-fluorooxindoles containing vicinal fluoroamine motifs with high efficiency and good enantioselectivity. This protocol uses readily available reactants and cheap organocatalysts, and it is operationally simple.
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Affiliation(s)
- Bu-Quan Zheng
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, China.
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14
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Franc M, Urban M, Císařová I, Veselý J. Highly enantioselective addition of sulfur-containing heterocycles to isatin-derived ketimines. Org Biomol Chem 2019; 17:7309-7314. [DOI: 10.1039/c9ob01338e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In this study, we report a highly stereoselective addition of sulfur-containing heterocyclic compounds to isatin-derived ketimines efficiently catalyzed by cinchonidine-derived bifunctional tertiary aminothiourea (1 mol%).
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Affiliation(s)
- Michael Franc
- Department of Organic Chemistry
- Charles University
- 12843 Prague
- Czech Republic
| | - Michal Urban
- Department of Organic Chemistry
- Charles University
- 12843 Prague
- Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry
- Charles University
- 12843 Prague
- Czech Republic
| | - Jan Veselý
- Department of Organic Chemistry
- Charles University
- 12843 Prague
- Czech Republic
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15
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Cheng WF, Chen LY, Xu FF, Lin WY, Ren X, Li Y. Organocatalytic asymmetric Michael addition between 3-subsituted oxindoles and enals catalyzed by camphor sulfonyl hydrazine. Org Biomol Chem 2019; 17:885-891. [DOI: 10.1039/c8ob02934b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
3,3-Disubstituted oxindoles containing vicinal stereogenic carbon centers have been synthesized through organocatalytic asymmetric Michael addition between 3-substituted oxindoles and enals catalyzed by chiral camphor sulfonyl hydrazines (CaSHs).
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Affiliation(s)
- Wen-Fu Cheng
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Ling-Yan Chen
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Fang-Fang Xu
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Wei-Yu Lin
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Xinfeng Ren
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Ya Li
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
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16
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He C, Cao W, Zhang J, Ge S, Feng X. Chiral N
,N
′-Dioxide/Scandium(III)-Catalyzed Asymmetric Alkylation of N
-Unprotected 3-Substituted Oxindoles. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800877] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Changqiang He
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
| | - Weidi Cao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
| | - Jianlin Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
| | - Shulin Ge
- 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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17
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Wang P, Gao Y, Ma D. Divergent Entry to Gelsedine-Type Alkaloids: Total Syntheses of (−)-Gelsedilam, (−)-Gelsenicine, (−)-Gelsedine, and (−)-Gelsemoxonine. J Am Chem Soc 2018; 140:11608-11612. [DOI: 10.1021/jacs.8b08127] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Pingluan Wang
- State Key Laboratory of Bioorganic & Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Yang Gao
- State Key Laboratory of Bioorganic & Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Dawei Ma
- State Key Laboratory of Bioorganic & Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
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18
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Xu H, Kang TC, Sha F, Wu XY. Enantioselective Mannich reaction between rhodanines and isatin-derived ketimines to construct vicinal tetrasubstituted stereocenters. Org Biomol Chem 2018; 16:5780-5787. [PMID: 30052256 DOI: 10.1039/c8ob01524d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An organocatalytic enantioselective Mannich reaction between rhodanines and isatin-derived ketimines was developed. With 2 mol% of a quinine-based tertiary amine-thiourea catalyst C2, 3,3-disubstituted oxindoles with vicinal tetrasubstituted stereocenters were obtained in moderate-to-excellent yields (43-99%) with excellent diastereoselectivities (98 : 2-99 : 1 dr) and good-to-excellent enantioselectivities (up to 97% ee). The readily available substrates, low catalyst loading and high stereoselectivity are the major features.
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Affiliation(s)
- Han Xu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.
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19
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Sawa M, Miyazaki S, Yonesaki R, Morimoto H, Ohshima T. Catalytic Enantioselective Decarboxylative Mannich-Type Reaction of N-Unprotected Isatin-Derived Ketimines. Org Lett 2018; 20:5393-5397. [DOI: 10.1021/acs.orglett.8b02306] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Masanao Sawa
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi,
Higashi-ku, Fukuoka 812-8582, Japan
| | - Shotaro Miyazaki
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi,
Higashi-ku, Fukuoka 812-8582, Japan
| | - Ryohei Yonesaki
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi,
Higashi-ku, Fukuoka 812-8582, Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi,
Higashi-ku, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi,
Higashi-ku, Fukuoka 812-8582, Japan
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20
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Urban M, Franc M, Hofmanová M, Císařová I, Veselý J. The enantioselective addition of 1-fluoro-1-nitro(phenylsulfonyl)methane to isatin-derived ketimines. Org Biomol Chem 2018; 15:9071-9076. [PMID: 29083001 DOI: 10.1039/c7ob02408h] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
An asymmetric organocatalytic addition of fluorinated phenylsulfonylnitromethane to isatin-derived ketimines was developed. The reaction was efficiently catalyzed by a chiral tertiary amine, cinchonine. This methodology provides a new type of optically active compound with two adjacent quaternary carbon stereocenters in good yield (up to 96%), with moderate diastereoselectivity (up to 5.7 : 1 dr) and excellent enantioselectivity (up to 98/96% ee).
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Affiliation(s)
- M Urban
- Department of Organic Chemistry, Charles University, Hlavova 8, 12843 Prague, Czech Republic.
| | - M Franc
- Department of Organic Chemistry, Charles University, Hlavova 8, 12843 Prague, Czech Republic.
| | - M Hofmanová
- Department of Organic Chemistry, Charles University, Hlavova 8, 12843 Prague, Czech Republic.
| | - I Císařová
- Department of Inorganic Chemistry, Charles University, Hlavova 8, 12843 Prague, Czech Republic
| | - J Veselý
- Department of Organic Chemistry, Charles University, Hlavova 8, 12843 Prague, Czech Republic.
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21
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Ričko S, Meden A, Ciber L, Štefane B, Požgan F, Svete J, Grošelj U. Construction of Vicinal Tetrasubstituted Stereogenic Centersviaa Mannich-Type Organocatalyzed Addition of Δ2-Pyrrolin-4-ones to Isatin Imines. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701384] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sebastijan Ričko
- Faculty of Chemistry and Chemical Technology; University of Ljubljana; Večna pot 113 SI-1000 Ljubljana Slovenia
| | - Anže Meden
- Faculty of Chemistry and Chemical Technology; University of Ljubljana; Večna pot 113 SI-1000 Ljubljana Slovenia
| | - Luka Ciber
- Faculty of Chemistry and Chemical Technology; University of Ljubljana; Večna pot 113 SI-1000 Ljubljana Slovenia
| | - Bogdan Štefane
- Faculty of Chemistry and Chemical Technology; University of Ljubljana; Večna pot 113 SI-1000 Ljubljana Slovenia
| | - Franc Požgan
- Faculty of Chemistry and Chemical Technology; University of Ljubljana; Večna pot 113 SI-1000 Ljubljana Slovenia
| | - Jurij Svete
- Faculty of Chemistry and Chemical Technology; University of Ljubljana; Večna pot 113 SI-1000 Ljubljana Slovenia
| | - Uroš Grošelj
- Faculty of Chemistry and Chemical Technology; University of Ljubljana; Večna pot 113 SI-1000 Ljubljana Slovenia
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22
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Sawa M, Morisaki K, Kondo Y, Morimoto H, Ohshima T. Direct Access to N-Unprotected α- and/or β-Tetrasubstituted Amino Acid Esters via Direct Catalytic Mannich-Type Reactions Using N-Unprotected Trifluoromethyl Ketimines. Chemistry 2017; 23:17022-17028. [PMID: 28950035 DOI: 10.1002/chem.201703516] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Indexed: 11/08/2022]
Abstract
Direct catalytic C-C bond-forming addition to N-unprotected ketimines is an efficient and straightforward method of synthesizing N-unprotected tetrasubstituted amines that eliminates prior protection/deprotection steps and allows facile transformation of the products. Despite its advantages, however, N-unprotected ketimines have difficulties in C-C bond-forming reactions, and only a limited number of reactions and substrates are reported compared with their N-protected counterparts. Herein we report that N-unprotected trifluoromethyl ketimines are effective for C-C bond-forming reactions using Mannich-type reactions as a model case. We demonstrate that Lewis acid catalysis was effective for promoting reactions with various N-unprotected trifluoromethyl ketimines, and thiourea organocatalysis was effective for promoting highly enantioselective reactions with various carbonyl nucleophiles, providing direct access to various N-unprotected α- and/or β-tetrasubstituted amino acid esters. Furthermore, direct construction of vicinal tetrasubstituted chiral carbon stereocenters was achieved for the first time in a highly enantio- and diastereoselective manner. These results demonstrate the potential of N-unprotected ketimines as substrates applicable to many other addition reactions.
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Affiliation(s)
- Masanao Sawa
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Kazuhiro Morisaki
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Yuta Kondo
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
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23
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Wu LL, Zeng QQ, Yang YX, Hu HF, Guan Z, He YH. Earthworm extract as a biocatalyst for asymmetric Mannich addition of cyclic ketimine 3-aryl-2H-1,4-benzoxazines. BIOCATAL BIOTRANSFOR 2017. [DOI: 10.1080/10242422.2017.1349116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Ling-Ling Wu
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, PR China
| | - Qing-Qing Zeng
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, PR China
| | - Ya-Xuan Yang
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, PR China
| | - Hong-Feng Hu
- School of Life Science, Southwest University, Chongqing, PR China
| | - Zhi Guan
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, PR China
| | - Yan-Hong He
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, PR China
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24
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Dalpozzo R. Recent Catalytic Asymmetric Syntheses of 3,3-Disubstituted Indolin-2-ones and 2,2-Disubstituted Indolin-3-ones. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700361] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Renato Dalpozzo
- Dipartimento di Chimica e Tecnologie Chimiche; Università della Calabria; 87030 Arcavacata di Rende (Cs Italy
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25
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Cheng C, Lu X, Ge L, Chen J, Cao W, Wu X, Zhao G. Effective asymmetric vinylogous Mannich reaction of isatin imines with α,α-dicyanoolefins in the presence of a simple chiral amide phosphonium bifunctional phase transfer catalyst. Org Chem Front 2017. [DOI: 10.1039/c6qo00546b] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A Mannich reaction between N-Boc isatin imine and α,α-dicyanoolefin as well as subsequent oxidative cleavage of the malonic nitrile moiety were described.
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Affiliation(s)
- Cang Cheng
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- China
| | - Xuehe Lu
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- China
| | - Luo Ge
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- China
| | - Jie Chen
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- China
| | - Weiguo Cao
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- China
| | - Xiaoyu Wu
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- China
- Key Laboratory of Synthetic Chemistry of Natural Substances
| | - Gang Zhao
- Key Laboratory of Synthetic Chemistry of Natural Substances
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
- China
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26
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Amr FI, Vila C, Blay G, Muñoz MC, Pedro JR. Organocatalytic Enantioselective Alkylation of Pyrazol-3-ones with Isatin-Derived Ketimines: Stereocontrolled Construction of Vicinal Tetrasubstituted Stereocenters. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600036] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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27
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Takeda T, Kondoh A, Terada M. Construction of Vicinal Quaternary Stereogenic Centers by Enantioselective Direct Mannich-Type Reaction Using a Chiral Bis(guanidino)iminophosphorane Catalyst. Angew Chem Int Ed Engl 2016; 55:4734-7. [DOI: 10.1002/anie.201601352] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Indexed: 12/30/2022]
Affiliation(s)
- Tadahiro Takeda
- Process Technology Research Laboratories; Daiichi Sankyo Co., Ltd.; Edogawa-ku Tokyo 134-8630 Japan
| | - Azusa Kondoh
- Research and Analytical Center for Giant Molecules; Graduate School of Science; Tohoku University; Aoba-ku Sendai 980-8578 Japan
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules; Graduate School of Science; Tohoku University; Aoba-ku Sendai 980-8578 Japan
- Department of Chemistry; Graduate School of Science; Tohoku University; Aoba-ku Sendai 980-8578 Japan
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28
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Takeda T, Kondoh A, Terada M. Construction of Vicinal Quaternary Stereogenic Centers by Enantioselective Direct Mannich‐Type Reaction Using a Chiral Bis(guanidino)iminophosphorane Catalyst. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601352] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Tadahiro Takeda
- Process Technology Research Laboratories Daiichi Sankyo Co., Ltd. Edogawa-ku Tokyo 134-8630 Japan
| | - Azusa Kondoh
- Research and Analytical Center for Giant Molecules Graduate School of Science Tohoku University Aoba-ku Sendai 980-8578 Japan
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules Graduate School of Science Tohoku University Aoba-ku Sendai 980-8578 Japan
- Department of Chemistry Graduate School of Science Tohoku University Aoba-ku Sendai 980-8578 Japan
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29
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Chen T, Cai C. Imidazolylpyridine-In(OTf)3 catalyzed enantioselective allylation of ketimines derived from isatins. Org Biomol Chem 2016; 14:5019-22. [DOI: 10.1039/c6ob00551a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
An enantioselective In(OTf)3-catalyzed allylation of ketimines derived from isatins in the presence of an imidazolylpyridine ligand is described.
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Affiliation(s)
- Tingting Chen
- College of Chemical Engineering
- Nanjing University of Science & Technology
- Nanjing
- China
| | - Chun Cai
- College of Chemical Engineering
- Nanjing University of Science & Technology
- Nanjing
- China
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30
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Nakamura S, Yamaji R, Iwanaga M. Enantioselective construction of imidazolines having vicinal tetra-substituted stereocenters by direct Mannich reaction of α-substituted α-isocyanoacetates with ketimines. Chem Commun (Camb) 2016; 52:7462-5. [DOI: 10.1039/c6cc02911f] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enantioselective direct Mannich-type reaction of ketimines with α-substituted α-isocyanoacetates gave imidazolines having vicinal tetra-substituted stereocenters with high stereoselectivity.
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Affiliation(s)
- Shuichi Nakamura
- Department of Life Science and Applied Chemistry
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Ryota Yamaji
- Department of Life Science and Applied Chemistry
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Masaru Iwanaga
- Department of Life Science and Applied Chemistry
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
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31
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Zhao K, Zhi Y, Li X, Puttreddy R, Rissanen K, Enders D. Asymmetric synthesis of 3,3′-pyrrolidinyl-dispirooxindoles via a one-pot organocatalytic Mannich/deprotection/aza-Michael sequence. Chem Commun (Camb) 2016; 52:2249-52. [DOI: 10.1039/c5cc10057g] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A highly stereoselective synthesis of functionalized 3,3′-pyrrolidinyl-dispirooxindole derivatives with three stereogenic centers, including two contiguous spiro-stereocenters, has been achieved through an organocatalytic Mannich/Boc-deprotection/aza-Michael sequence.
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Affiliation(s)
- Kun Zhao
- Institute of Organic Chemistry
- RWTH Aachen University
- Aachen
- Germany
| | - Ying Zhi
- Institute of Organic Chemistry
- RWTH Aachen University
- Aachen
- Germany
| | - Xinyi Li
- Institute of Organic Chemistry
- RWTH Aachen University
- Aachen
- Germany
| | - Rakesh Puttreddy
- Department of Chemistry
- Nanoscience Center
- University of Jyvaskyla
- Finland
| | - Kari Rissanen
- Department of Chemistry
- Nanoscience Center
- University of Jyvaskyla
- Finland
| | - Dieter Enders
- Institute of Organic Chemistry
- RWTH Aachen University
- Aachen
- Germany
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32
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Liu J, Zhu FM, Chu YB, Huang LH, Zhou YF. The 2′-phenyl cinchonidine thiourea-catalyzed asymmetric addition of alcohols to isatin-derived N-Boc ketimines. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.08.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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33
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Zhang ZP, Dong N, Li X, Cheng JP. Highly enantioselective Michael addition reactions of 2-substituted benzofuran-3(2H)-ones to nitroolefins. Org Biomol Chem 2015; 13:9943-7. [PMID: 26349788 DOI: 10.1039/c5ob01691f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly enantioselective Michael addition reaction of 2-substituted benzofuran-3(2H)-ones to nitroolefins was promoted by a bifunctional squaramide catalyst. As a result, a number of chiral 2,2'-substituted benzofuran-3-one derivatives, bearing adjacent quaternary-tertiary stereocenters, were efficiently synthesized with excellent enantioselectivities.
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Affiliation(s)
- Zhi-Pei Zhang
- State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China.
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34
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Bao X, Wang B, Cui L, Zhu G, He Y, Qu J, Song Y. An Organocatalytic Asymmetric Friedel–Crafts Addition/Fluorination Sequence: Construction of Oxindole–Pyrazolone Conjugates Bearing Vicinal Tetrasubstituted Stereocenters. Org Lett 2015; 17:5168-71. [DOI: 10.1021/acs.orglett.5b02470] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Xiaoze Bao
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Baomin Wang
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Longchen Cui
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Guodong Zhu
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yuli He
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Jingping Qu
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yuming Song
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
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35
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Substrate scope in the copper-mediated construction of bis-oxindoles via a double C–H/Ar–H coupling process. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.02.060] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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36
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Engl OD, Fritz SP, Wennemers H. Stereoselective Organocatalytic Synthesis of Oxindoles with Adjacent Tetrasubstituted Stereocenters. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502976] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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37
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Asymmetric addition of 3-substituted benzofuran-2-ones to isatin N-Boc ketimines catalyzed by chiral biscinchona alkaloid catalyst. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.114] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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38
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Engl OD, Fritz SP, Wennemers H. Stereoselective Organocatalytic Synthesis of Oxindoles with Adjacent Tetrasubstituted Stereocenters. Angew Chem Int Ed Engl 2015; 54:8193-7. [DOI: 10.1002/anie.201502976] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 05/05/2015] [Indexed: 01/07/2023]
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39
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Mohammadi Ziarani G, Moradi R, Lashgari N. Asymmetric synthesis of chiral 3,3-disubstituted oxindoles using isatin as starting material. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.04.011] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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40
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Liu T, Liu W, Li X, Peng F, Shao Z. Catalytic Asymmetric Construction of Vicinal Tetrasubstituted Stereocenters by the Mannich Reaction of Linear α-Substituted Monothiomalonates with Isatin N-Boc Ketimines. J Org Chem 2015; 80:4950-6. [PMID: 25897636 DOI: 10.1021/acs.joc.5b00302] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A highly diastereo- and enantioselective method for the construction of vicinal tetrasubstituted stereocenters through the first catalytic asymmetric Mannich reaction of linear α-substituted MTMs with isatin N-Boc ketimines has been developed. This protocol provides atom-economic synthesis of less accessible 3-aminooxindoles bearing vicinal tetrasubstituted stereocenters. Notably, it also constitutes the first example of stereoselective synthesis of β-amino thioesters bearing vicinal tetrasubstituted stereocenters.
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Affiliation(s)
- Teng Liu
- †Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Weiwei Liu
- †Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Xiaonian Li
- ‡Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Fangzhi Peng
- †Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Zhihui Shao
- †Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
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41
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Sanzone A, Somfai P. A Diels-Alder Approach to a Communesin Model: A/B-Cyclization Route. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500177] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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42
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Zhao K, Shu T, Jia J, Raabe G, Enders D. An organocatalytic Mannich/denitration reaction for the asymmetric synthesis of 3-ethylacetate-substitued 3-amino-2-oxindoles: formal synthesis of AG-041R. Chemistry 2015; 21:3933-6. [PMID: 25630891 DOI: 10.1002/chem.201406422] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Indexed: 11/06/2022]
Abstract
The highly enantioselective organocatalytic addition of ethyl nitroacetate to isatin-derived N-Boc ketimines (Boc = tert-butoxycarbonyl), followed by the removal of the nitro group, is described. The scalable reaction sequence leads to the title compounds as important intermediates of pyrroloindoline alkaloids and related drugs in excellent yields and enantioselectivities. The synthesis of the hexahydrofurano[2,3-b]indole skeleton, the spirocarbamate oxindole unit, and the formal synthesis of AG-041R have been carried out to demonstrate the synthetic utility of this protocol.
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Affiliation(s)
- Kun Zhao
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241-809-2127 http://www.oc.rwth-aachen.de/akenders/AKEN_D.HTM
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43
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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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44
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45
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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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