Enantioselective synthesis of α-nitro-δ-ketosulfones via a quinine–squaramide catalyzed conjugate addition of α-nitrosulfones to enones
作者:Kalisankar Bera、Irishi N. N. Namboothiri
DOI:10.1039/c3cc45985c
日期:——
Conjugate addition of α-nitrosulfones to vinyl ketones in the presence of 0.2 mol% of a quinineâsquaramide organocatalyst afforded α-nitro-δ-ketosulfones possessing a tetrasubstituted chiral center in excellent yield and enantioselectivity in most cases. This strategy also offers a facile and convenient entry into γ-sulfonylhydroxamates that are one carbon homologs of potent enzyme inhibitors.