Wang Q, van Gemmeren M, List B. Asymmetric disulfonimide-catalyzed synthesis of δ-amino-β-ketoester derivatives by
vinylogous Mukaiyama-Mannich reactions.
Angew Chem Int Ed Engl 2014;
53:13592-5. [PMID:
25348924 DOI:
10.1002/anie.201407532]
[Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Indexed: 11/08/2022]
Abstract
An organocatalytic asymmetric synthesis of δ-amino-β-ketoester derivatives has been developed. A chiral disulfonimide (DSI) serves as a highly efficient precatalyst for a vinylogous Mukaiyama-Mannich reaction of readily available dioxinone-derived silyloxydienes with N-Boc-protected imines, delivering products in excellent yields and enantioselectivities. The synthetic utility of this reaction is illustrated in various transformations, including a new CC bond-forming reaction, which provide useful enantioenriched building blocks. The methodology is applied in a formal synthesis of (-)-lasubin.
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