The Biginelli reaction is a well-known three-component reaction that involves the condensation of an aldehyde, a β-ketoester, and urea or thiourea in the presence of a suitable catalyst. In this case, you can modify the reaction to incorporate the appropriate starting materials for your desired coumarino[2,3-b]pyridine structure.
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2(1H)-Pyrimidinone, 5-benzoyl-3,4-dihydro-4,6-diphenyl-
ethyl 4-(3,4-dimethoxyphenyl)-2-hydroxy-6-methyl-1,4-dihydro-5-pyrimidinecarboxylate
6-methyl-2-oxo-4-phenyl-1,2,3,4-tetrahydro-pyridine-3,5-dicarboxylic acid diethyl ester
4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester
perchlorate 2,6-dimethyl-5-phenyl-1-(4'-hydroxyphenyl)-4-oxopyrimidinium
