A highly efficient [3+2] cycloaddition of nitrile oxides and azomethine imines to N-vinylpyrroles

Abstract 1,3-Dipolar cycloaddition of various nitrile oxides to substituted N -vinylpyrroles proceed with high efficiency and selectivity with the formation of single isomer of 5-pyrrolyl-substituted isoxazoline. The reaction of N -vinylpyrroles with cyclic azomethine imines occurs regioselectively affording 7-(pyrrol-1-yl)- substituted pyrazolo[1,2- a ]pyrazolones as a mixture of two diastereomers.