N-Heterocyclic carbene-catalyzed sulfa-Michael addition of enals
作者:Zi-Song Cong、Yang-Guo Li、Guang-Fen Du、Cheng-Zhi Gu、Bin Dai、Lin He
DOI:10.1039/c7cc07269d
日期:——
An efficient N-heterocycliccarbene (NHC) catalyzed sulfa-Michael addition (SMA) between enals and thiols has been developed. Under the catalysis of 10 mol% stable free carbene IPr and with 20 mol% hexafluoroisopropanol (HFIP) as an additive, enals react with a variety of thiols to afford the SMA adducts in 54–98% yields. In this process, the free carbene preferentially interacts with thiols through