Acetic Acid → HCID 18602497, compound

Participants

Reaction Steps

A solution of 10.0 g (0.03 mole) of cyanomethyl [5-(4-chlorobenzoyl)-1,4-dimethyl-1H-pyrrol-2-yl]acetate, 1.6 g (0.015 mole) of alanine methyl ester hydrochloride, 0.3 ml of glacial acetic acid, and 2.1 ml (0.015 mole) triethylamine in 40 ml of THF was heated under reflux for 31/2 hours. A second addition of 1.6 g of alanine methyl ester hydrochloride and 2.1 ml of triethylamine was made. The mixture was heated under reflux for 2 hours. A fourth addition of 2.0 g (0.018 mole) of triethylamine was made. The mixture was heated under reflux for 16 hours. The reaction was partitioned between chloroform and dilute hydrochloric acid. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. The solvent was evaporated in vacuo. The residue was recrystallized from acetonitrile to give 9.6 g of methyl N-{[5-(4-chlorobenzoyl)-1,4-dimethyl-1H-pyrrol-2-yl]acetyl}alaninate, m.p. 163°-165° C. (85% yield).

Provenance & Evidence