Chiral Squaramide-Catalyzed Enantioselective Conjugate Michael Addition of Various Thiols to α,β-Unsaturated N-Acylated Oxazolidin-2-ones
作者:Le Dai、Hongjun Yang、Fener Chen
DOI:10.1002/ejoc.201100403
日期:2011.9
A highly enantioselective sulfa-Michael addition (SMA) of variousthiols to α,β-unsaturatedN-acylated oxazolidinones has been achieved with a chiral squaramide catalyst under very mild reaction conditions. In addition, the conversion of the β-thio-substituted adduct to the corresponding methyl β-tosylbutanoate was demonstrated in high yield through a methanolysis/oxidation sequence.