Acetic Acid → 2,6-Dimethyl-4-(2-methyl-4-oxo-4H-chromen-8-yl)-5-(4-methylpentanoyl)-1,4-dihydropyridine-3-carbonitrile

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Reaction Steps

100 mg (0.53 mmol) of 2-methyl-4-oxo-4H-chromene-8-carbaldehyde are dissolved with 55.8 mg (0.53 mmol) of sodium 1-cyanoprop-1-en-2-olate, 82.4 mg (0.53 mmol) of 2-amino-7-methyloct-2-en-4-one (example 14, stage a) and 31.9 mg (0.53 mmol) of acetic acid in 5 ml of 2-propanol and heated under reflux under argon for 6 h. The solvent is removed in vacuo, and the residue is purified by preparative HPLC. 47 mg (22% of theory) of the title compound are obtained as a yellow solid.

Provenance & Evidence