Hydrochloric Acid → N-arachidonoyl-L-tyrosine methyl ester

Participants

Reaction Conditions

Reaction Steps

Arachidonic acid (152 g, 0.5 mmol) and triethylamine (52 mg, 0.51 mmol) were dissolved in 3 ml of dry acetonitrile and chilled to −15° C., and 70 mg (0.51 mmol) of butyl chloroformate was added. After 30 min, the mixture free of the precipitated triethylamine hydrochloride was pipetted in a solution of tyrosine methyl ester hydrochloride (232 mg, 1 mmol) and 0.14 ml of triethylamine in 1 ml of methanol, stirring was continued for 15 min at −15° C., then the mixture obtained was allowed to warm to room temperature. After 2 h, 0.5 M HCl was added, and the mixture was extracted with ether (20 ml). The extract was washed with water, then dried with Na2SO4, and evaporated in vacuo. The residue was dissolved in 2 ml of chloroform and purified by column (2×2 cm) chromatography on aluminum oxide (basic, Brockmann II). Elution of the column with chloroform-methanol (9:1 v/v) and evaporation of the appropriate fractions gave 222 mg (95%) of desired N-arachidonoyl-L-tyrosine methyl ester as oil: TLC (system A) Rf 0.6.

Provenance & Evidence