Synthesis of 3-Aminopyrazolopyrimidine Derivatives Using N-Bis(methylthio)methylene-p-toluenesulfonamide
N-Bis(methylthio)methylene-p-toluenesulfonamide (1) reacted with active methylene compounds such as malononitrile (2a) and cyanoacetamide (2b) to give the corresponding 3-methylthio-3-p-toluenesulfonylaminopropenenitrile derivatives 3a,b which were found