An efficient organocatalyzed asymmetric synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles via vinylogous Michael addition of non-activated β,γ-unsaturated butenolide to 2-iminochromenes has been realized.
V. Gupta and R. P. Singh, New J. Chem., 2019, 43, 9771 DOI: 10.1039/C9NJ01584A
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