Cu(I)-catalyzed one-pot reactions of isatins,indoles, and amines toward unsymmetrically substituted 2-carbonylarylureas

A series of unsymmetrical arylureas was obtained by the one-pot method for reacting isatins with indoles incorporating primary amino moieties, a significant heterocyclic skeleton for diverse pharmaceutically active structures. The reaction proceeds through Cu(I)-catalyzed C2C3 bond of the ring-opening isatins and then expands the substrates in the optimum conditions. Furthermore, selected compounds 4b and 4k exhibit moderate to good anti-schistosomicidal activities.     

Synthesis of 1-acyl-5-aryl biurets

Fourteen new 1-acyl-5-aryl biurets were synthesized by the reaction of aryl ureas with acylisocynantes. The latter was obtained from acyl chloride and lead cyanate in dichloromethane, using pyridine as catalyst. The structures of compounds 3a-n were confirmed by IR,1H NMR and MS spectra.