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 various thiols to α,β-unsaturated N-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.
在非常温和的反应条件下,使用手性方酸酰胺催化剂实现了各种硫醇与 α,β-不饱和 N-酰化恶唑烷酮的高度对映选择性磺胺-迈克尔加成 (SMA)。此外,β-硫代取代的加合物转化为相应的 β-甲苯磺酰丁酸甲酯通过甲醇分解/氧化序列以高产率得到证明。