Synthesis of 2-Hetaryl-3-(indol-1-yl)-and -(3-pyrrol-1-yl)maleimides and Study of Their Conversions under the Action of Protic Acids*

A series of 3-(indol-1-yl)maleimides has been synthesized, substituted at position 2 by residues of amines or various nitrogenous heterocycles. The possibility of obtaining new polycondensed heterocyclic structures from them has been studied. Experimental investigations confirmed theoretical predictions made on the basis of results of quantum-chemical calculations.