Facile Synthesis of N-Sulfonylcyclothioureas in Water
作者:Guoxiang Wan、Liang Xu、Xiaosi Ma、Yong Zhang、Jian Wang、Jian Zhang、Ning Ma
DOI:10.1002/cjoc.201180360
日期:2011.10
AbstractA sequential one‐pot synthesis of N‐sulfonylcyclothioureas from N‐monosulfonyl diamines, CS2 and chloroacetic acid at room temperature in water is described. In the absence of highly toxic thiophosgene and organic solvents, this method is environmentally benign. Simple reaction conditions, easy purification of the products, good yields and thioglycolic acid as the useful byproduct are also important attributes of this methodology. The plausible mechanism including tandem reactions is proposed.
Silica gel promoted synthesis of N-sulfonylcyclothioureas in water
作者:Guo-Xiang Wan、Liang Xu、Xiao-Si Ma、Ning Ma
DOI:10.1016/j.tetlet.2011.09.075
日期:2011.11
N-Sulfonylcyclothioureas were synthesized from N-sulfonyldiamines and CS2 with moderate to good yields in silica gel-water system. Moreover, the silica gel can be recycled for at least three times.