Water → HCID 14032622, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 3.0 g of 1-acetyl-4-(2,4-difluorobenzoyl)piperidine phenylhydrazone in 30 ml of dimethylformamide, under nitrogen, was added 0.44 g of a 50% oil dispersion of sodium hydride. The reaction mixture was heated, and at about 40° C. a vigorous evolution of hydrogen occurred. The temperature was then raised to 80° C. and held there for 1.5 hrs. The reaction mixture was poured into water and the aqueous suspension was extracted with ethyl acetate. The ethyl acetate extracts were washed with water, dried over anhydrous magnesium sulfate and concentrated to yield an oil. The oil was combined with the oil from another experiment and a total of 13.5 g of material was chromatographed on a Water's Prep LC 500. Two silica gel columns were utilized and dichloromethane-methanol (3%) was used as the eluent. The appropriate fractions were evaporated. The residue was recrystallized twice from isopropyl alcohol-water (one charcoal treatment) to yield 2.4 g (18%) of product, mp 126°-128° C.

Provenance & Evidence