A novel method for the synthesis of 2(3H)benzimidazolones, 2(3H)-benzoxazolone, and 2(3H)-benzothiazolone via in situ generated ortho substituted benzoic acid azides:: Application of ammonium azide and Vilsmeier complex for acid azide generation

An easy and generalized route to 2(3H)-benzimidazolones, 2(3H)-benzoxazolone and 2(3H)-benzothiazolone is attempted. A novel one-pot method for the in situ generation and cyclisation of ortho substituted benzoic acid azides is reported via the application of ammonium azide and Vilsmeier complex.