Advanced Synthesis and Catalysis p. 619 - 623 (2008)
Update date:2022-08-04
Topics:
Pei, Dong
Zhang, Yu
Wei, Siyu
Wang, Meng
Sun, Jian
We recently reported the first example of S-chiral organocatalysts, that are highly efficient and enantioselective in substoichometric amounts, and which use a chiral monosulfinamide group as Lewis base to activate trichlorosilane (HSiCl3) to reduce N-arylketimines. Aplausible mechanism involving two molecules of the monosulfinamde catalyst for the activation of HSiCl 3 prompted us to design S-chiral bissulfinamides as new catalysts. We herein describe our findings that an easily prepared S-chiral bissulfinamide bearing a five-methylene linkage not only inherited the excellent substrate generality from the monosulfinamide catalysts, but also exhibited further improved enantioselectivity.
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