Abstract

A one-pot synthesis of sterically congested electron-poor N-vinyl pyrazoles in fairly good yields1H, and 13C NMR spectroscopy, and single by the reaction of ethyl 3-phenyl-2-propynoate, pyrazoles and triphenylphosphine is reported. The structures of these compounds were confirmed by IR, crystal X-ray structure determination. The structural analysis of the products indicated that the reaction is completely regio- and stereoselective.