ARYLAZOMETHYLENETRIPHENYLPHOSPHORANES: INTRA MOLECULAR REACTIONS WITH ALDONITRONYL SUBSTITUENTS IN THE ORTHO POSITION WITH RESPECT TO THE AZOPHOSPHORANE GROUP

Article abstract of DOI:10.1016/S0040-4020(01)96646-3

The title reactions begin with the attack on the aldonitronyl group by the nitrogen atom α to the ylidic carbon, to give, presumably, a cyclic species, which splits off a nitroso compound to afford indazolyl-2-methylenetriphenylphosphorane.In one case the primarily formed cyclic species underwent a further intra molecular cyclization to imidazo<1,2-b>indazole.