1,3-Dipolar cycloadditions to an isoquinolinium imine obtained by thermally disallowed valence tautomerism of a 6-cyclohexylimino-1,1a,6,6a-tetrahydro-1a-phenylindeno[1,2-b]azirine

Abstract

1-Cyclohexyl-6-(cyclohexylimino)-1,1a,6,6a-tetrahydro-1a-phenylindeno[1,2-b]azirine at 135° in toluene undergoes a formally disallowed valence tautomerism to an isoquinolinium imine which may be trapped as an azomethine ylide in a series of 1,3-dipolar cycloadditions.