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Zhang J, Li WS, Lu S, Tian F, Wang LX. Enantioselective Benzylation and Allylation of a Crucial Synthon of 3-Amino Oxindole Schiff Base Promoted by a Cinchonidinium Phase Transfer Catalyst to Enable the Effective Preparation of Chiral Quaternary 3-Amino Oxindoles. J Org Chem 2023; 88:5801-5812. [PMID: 37053546 DOI: 10.1021/acs.joc.3c00235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/15/2023]
Abstract
3-Amino oxindole Schiff base has been used as an efficient and crucial synthon for highly enantioselective benzylation and allylation with benzyl bromides and allyl bromides in the presence of a 1,3-bis[O(9)-allylcinchonidinium-N-methyl]-2-fluorobenzene dibromide phase transfer catalyst under mild reaction conditions. A broad series of chiral quaternary 3-amino oxindoles were smoothly obtained in good to excellent yields with excellent enantioselectivities (up to 98% ee) with broad substrate generality. A typical scale-up preparation and subsequent Ullman coupling reaction were also smoothly performed, and a special and important chiral spirooxindole benzofuzed pyrrol scaffold with potential pharmaceutical and organocatalytic activities was successfully obtained.
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Affiliation(s)
- Jian Zhang
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wen-Sheng Li
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Sen Lu
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fang Tian
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Li-Xin Wang
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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Azaz T, Mourya H, Singh V, Ram B, Tiwari B. Reductive Alkenylation of Ketimines via Hydride Transfer from Aldehydes. J Org Chem 2023; 88:632-639. [PMID: 36475729 DOI: 10.1021/acs.joc.2c01508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The first direct N-heterocyclic carbene (NHC)-catalyzed preparation of allylic amines bearing a quaternary center (α-tertiary amine) from isatin-derived ketimines in the presence of vinyl selenones and aldehydes is reported. This multicomponent reaction is expected to proceed via unprecedented in situ reduction of imines through a hydride transfer from the aldehydes.
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Affiliation(s)
- Tazeen Azaz
- Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, SGPGIMS-Campus, Raebareli Road, Lucknow 226014, India.,Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - Hemlata Mourya
- Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, SGPGIMS-Campus, Raebareli Road, Lucknow 226014, India
| | - Vikram Singh
- Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, SGPGIMS-Campus, Raebareli Road, Lucknow 226014, India.,Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - Bali Ram
- Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - Bhoopendra Tiwari
- Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, SGPGIMS-Campus, Raebareli Road, Lucknow 226014, India
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Sharma PR, Malik A, Bandaru S, Vashisth K, Rana NK, Sharma RK. Experimental and computational studies on the Cinchona anchored calixarene catalysed asymmetric Michael addition reaction. Chem Commun (Camb) 2022; 58:7249-7252. [PMID: 35670109 DOI: 10.1039/d2cc02422e] [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
Lower-rim Cinchona anchored calix[4]arene cationic catalysts were developed for asymmetric Michael addition of acetylacetone to β-nitrostyrenes. The desired Michael adducts were formed with high yields and enantioselectivities. Density functional theory investigations throw light on the catalyst-substrate interaction and the reaction mechanism.
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Affiliation(s)
- Pragati R Sharma
- Sustainable Materials and Catalysis Research Laboratory (SMCRL), Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342037, India.
| | - Apoorva Malik
- Sustainable Materials and Catalysis Research Laboratory (SMCRL), Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342037, India.
| | - Sateesh Bandaru
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou-310018, China
| | - Kanika Vashisth
- Sustainable Materials and Catalysis Research Laboratory (SMCRL), Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342037, India. .,The Department of Chemistry & Biochemistry, Baylor University, Baylor Science Building, Baylor Sciences Bldg. D.208, One Bear Place #97348, Waco, TX 76798
| | - Nirmal K Rana
- Sustainable Materials and Catalysis Research Laboratory (SMCRL), Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342037, India.
| | - Rakesh K Sharma
- Sustainable Materials and Catalysis Research Laboratory (SMCRL), Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342037, India.
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Benaglia M, Greco SJ, Westphal R, Venturini Filho E, Medici F. Stereoselective Domino Reactions in the Synthesis of Spiro Compounds. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1771-0641] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
AbstractThis review summarizes the latest developments in asymmetric domino reactions, with the emphasis on the preparation of spiro compounds. Discussions on the stereoselectivity of the transformations, the reaction mechanisms, the rationalization of the stereochemical outcome, and the applications of domino reactions to the synthesis of biologically active molecules and natural products are included when appropriate.1 Introduction2 Asymmetric Domino Reactions2.1 Domino Reactions Initiated by Michael Reactions2.2 Domino Reactions Initiated by Mannich Reactions2.3 Domino Reactions Initiated by Knoevenagel Reactions2.4 Domino Reactions Initiated by Cycloaddition Reactions2.5 Domino Reactions Initiated by Metal Insertion2.6 Other Mechanisms3 Conclusion
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Novel preparation of chiral 3,2′-pyrrolidinyl spirooxindole from an enantioselective Michael addition between 3-(diphenylmethylene)-amino-oxindole and acrolein catalyzed by a cinchona alkaloid. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2021.153565] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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