HCID 67900236, compound → HCID 67900143, compound

Participants

Reaction Steps

A solution of (E)-3-(5-methyl-1H-imidazol-4-yl)-1-(2-naphthalenyl)-2-propen-1-one maleate (300 mg) in hot methanol (90 ml) was hydrogenated at room temperature and atmospheric pressure over a stirred suspension of pre-reduced 10% palladium oxide on carbon (50% aqueous paste; 30 mg) in methanol (10 ml) for 16 h. The suspension was filtered, evaporated in vacuo, and the residual oil (ca. 350 mg) was partitioned between dichloromethane (3×50 ml) and 2N sodium carbonate (50 ml). The combined organic extracts were dried and evaporated in vacuo. The residual oil (300 mg) was dissolved in absolute ethanol (6 ml) and treated with a solution of maleic acid (100 mg) in ethanol (1 ml). Dilution with dry ether (ca. 75 ml) afforded the title compound (210 mg) as a solid, m.p. 137°-138°, t.l.c. (System A, 89:10:1) Rf 0.33.

Provenance & Evidence