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- Karczewski, Maksymilian, et al. Show all 6 Authors
- Journal of organic chemistry 2014 v.79 no.18 pp. 8723-8732
- Lewis acids; absorption; benzene derivatives; bromine; esters; fluorescence; nitrogen dioxide; optical properties; organic chemistry; oxidation; phenols; solvents; transesterification
- ... A highly efficient procedure for the synthesis of bis-coumarins fused at the pyranone ring has been developed. The electron-rich phenols reacted with esters of coumarin-3-carboxylic acids, leading to substituted chromeno[3,4-c]chromene-6,7-diones. The reaction is catalyzed by both Lewis acids and 4-dimethylaminopyridine. The most probable mechanistic pathway involves Lewis acid catalyzed or DMAP c ...