Cyclobutyl 3-aminocrotonate → Cyclobutyl 5-benzoyl-2,6-dimethyl-4-(2-methyl-4-oxo-4H-chromen-8-yl)-1,4-dihydropyridine-3-carboxylate

Participants

Reaction Steps

340 mg (1.02 mmol) of 2-[(2-methyl-4-oxo-4H-chromen-8-yl)methylene]-1-phenylbutane-1,3-dione are dissolved with 156 mg (1.8 mmol) of cyclobutyl 3-aminocrotonate in 5 ml of ethanol and heated under reflux under argon for 24 h. The reaction solution is purified by preparative HPLC. Concentration of the product fractions and crystallization from ethyl acetate result in 206 mg (43% of theory) of the title compound as a yellow solid.

Provenance & Evidence