<scp>l</scp>-Valine derived chiral N-sulfinamides as effective organocatalysts for the asymmetric hydrosilylation of N-alkyl and N-aryl protected ketimines
作者:Chao Wang、Xinjun Wu、Li Zhou、Jian Sun
DOI:10.1039/c4ob01257g
日期:——
L-Valine derived N-sulfinamides have been developed as efficient enantioselective Lewis basic organocatalysts for the asymmetric reduction of N-aryl and N-alkyl ketimines with trichlorosilane. Catalyst 3c afforded up to 99% yield and 96% ee in the reduction of N-alkyl ketimines and up to 98% yield and 98% ee in the reduction of N-aryl ketimines.
A visible-light-induced regioselective tandem enamido β-C(sp2)−H alkylation/acrylamido alkylation/cyclizative alkenylation sequence of 3-aza-1,5-dienes is presented. This protocol is regiospecific, features a broad substrate scope, and provides a directaccess to 3,4-dialkylated 4-pyrrolin-2-ones from readily available N-alkenylacrylamides. It is readily scalable to a gram scale, and could be induced