One-Pot Synthesis of Pyrroles Using a Titanium-Catalyzed Multicomponent Coupling Procedure.

The Ti-catalyzed iminoamination reaction of alkynes, aniline or cyclohexylamine, and tert-butyl isocyanide produces 1,3-diimines, which are directly coupled with glycine ethyl ester hydrochloride to give 2-carboxypyrrole derivatives.