SCHEDULED MAINTENANCE
The coumarin core represents the quintessential scaffold of many natural products. While C-3 alkylation is easily achievable, effective greener strategies for C-4 alkylation have been less forthcoming. Herein, we report a metal-free photoinduced deaminative strategy for C-4 alkylation of coumarins using redox activated secondary and benzylic amine derived Katritzky pyridinium salts.
S. Singh, K. N. Tripathi and R. P. Singh, Org. Biomol. Chem., 2022, 20, 5716 DOI: 10.1039/D2OB00943A
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