Ru(ii)-catalyzed carbonylation reaction using ketosulfoxonium ylide as the carbonyl source: synthesis of indazolo-phthalazinetriones and indazolo-indazolediones†

An unprecedented Ru(II)-catalyzed carbonylative annulation reaction of phenyl-phthalazinediones and phenyl-indazolones is developed. In this reaction, sulfoxonium ylide is used as the carbonyl source in the presence of air for the synthesis of indazolo-phthalazinetriones and indazolo-indazolediones.