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Zhang D, Chen Y, Cai H, Yin L, Zhong J, Man J, Zhang QF, Bethi V, Tanaka F. Direct Catalytic Asymmetric Synthesis of Oxindole-Derived δ-Hydroxy-β-ketoesters by Aldol Reactions. Org Lett 2020; 22:6-10. [PMID: 31746616 DOI: 10.1021/acs.orglett.9b03527] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Direct asymmetric synthesis of δ-hydroxy-β-ketoesters was accomplished via regio- and enantioselective aldol reactions of β-ketoesters with isatins catalyzed by cinchona alkaloid thiourea derivatives. The C-C bond formation of the reactions occurred only at the γ-position of the β-ketoesters. Reaction progress monitoring and product stability analyses under the conditions that included the catalyst indicated that the γ-position reaction products were formed kinetically. Various δ-hydroxy-β-ketoesters bearing 3-alkyl-3-hydroxyoxindole cores relevant to the development of bioactive molecules were synthesized.
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Affiliation(s)
- Dongxin Zhang
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Yan Chen
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Hu Cai
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Lei Yin
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Junchao Zhong
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Jingjing Man
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Qian-Feng Zhang
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Venkati Bethi
- Chemistry and Chemical Bioengineering Unit , Okinawa Institute of Science and Technology Graduate University , 1919-1 Tancha , Onna , Okinawa 904-0495 , Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit , Okinawa Institute of Science and Technology Graduate University , 1919-1 Tancha , Onna , Okinawa 904-0495 , Japan
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