Reaction of 2-acetyl-5-methyl-1, 2, 3-diazaphosphole with diazoacetic ester

Abstract

Independent of the nature of the solvent, the reaction of 2-acetyl-5-methyl-1,2,3-diazaphosphole with diazoacetic ester proceeds without the evolution of nitrogen to give Δ2-phosphapyrazoline derivatives. The latter in CH2Cl2, CH3CN, or alcohols are isomerized to compounds with two NH groups. © 1984 Plenum Publishing Corporation.