Hydrochloric Acid → 17-Allyl-3,14beta-dihydroxy-4,5beta-epoxy-6-methylamino-morphinan

Participants

Reaction Steps

Naloxone hydrochloride (3.0 g), methylamine hydrochloride (5.57 g) and sodium cyanoborohydride (0.33 g) were suspended in anhydrous methanol (40 ml) and stirred for 17 hours at room temperature. After addition of concentrated hydrochloric acid (1.0 ml) and removal of solvent by distillation, distilled water (50 ml) was added followed by washing with chloroform (20 ml). Saturated aqueous sodium bicarbonate (10 ml) was added to make the solution basic followed by extraction with chloroform (30 ml×3). After drying with anhydrous magnesium sulfate, the solvent was distilled off. The resulting crude product was purified with silica gel column chromatography (Merk 7734 100 g; ethyl acetate/methanol/aqueous ammonia=90/10/1→80/20/2) to obtain the target compound in the form of a pure fraction (12 0.4 g, 12%; 13 0.8 g, 24%).

Provenance & Evidence