A facile approach to polysubstituted pyrazoles from hydrazonyl chlorides and vinyl azides
摘要:
A novel and facile approach to polysubstituted pyrazoles from readily synthesized hydrazonyl chlorides and vinyl azides was developed. The reaction was regiospecific and proceeded under mild conditions in the presence of base. (C) 2011 Elsevier Ltd. All rights reserved.
A simple and direct synthesis of polysubstituted 5-aminopyrimidines from α-azidovinyl ketones and amidines in the present of base was developed. The reactions were performed under mild conditions in good to excellent yields. Additionally a possible mechanism of 1,4-Michael addition is proposed.