Substituted Pyrrololactams via Ring Expansion of Spiro-2H-pyrroles from Intermolecular Alkyne-Isocyanide Click Reactions

초록

The facile synthesis of 6- to 8-membered pyrrololactams has been developed using a ring expansion of spiro-2H-pyrroles, the products of intermolecular alkyne–isocyanide click reactions. The key to successful ring expansion of spiro-2H-pyrroles to pyrrololactams is the enforced orbital overlap between the internal alkene and the amide carbonyl group through the conformationally locked bicyclic structures. The newly disclosed α-isocyano lactams, substrates for click reactions, should find their utility in the synthesis of pharmaceutically important heterocyclic compounds.

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