C. Che, S. Li, X. Jiiang, J. M. Quan, S. Lin, Z. Yang*
Org. Lett. 2010, 12, 4682
One-pot and diastereoselective syntheses of diverse chromeno[3,4-c]pyrrole-3,4-diones from readily available starting materials were achieved via sequential Ugi-4CR and intramolecular Michael addition.
