A new route to synthesis of substituted pyrazoles through oxidative [3+2] cycloaddition of electron deficient alkenes and diazocarbonyl compounds

A collection of 3,5-disubstituted pyrazoles are constructed by the oxidative [3+2] cycloaddition of electron deficient terminal olefins with α-diazoesters and amides in the presence of Oxone and cetyltrimethyl ammonium bromide. The highlights of this protocol are; (i) shorter reaction time (ii) moderate to excellent yield (iii) good regioselectivity.