Hydrochloric Acid → 1-{3-[4-(4-Chlorobenzyl)piperazin-1-yl]propyl}-3-(4-carbamylphenyl)urea dihydrochloride

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反応手順

A solution of 1-{3-[4-(4-chlorobenzyl)piperazin-1-yl]-propyl}-3-(4-cyanophenyl)urea dihydrochloride monohydrate (10.0 g; 19.9 mmole), glacial acetic acid (120 ml), and concentrated hydrochloric acid (80 ml) was heated at 80° C. for 30 minutes. The mixture was then poured over ice, and basified with aqueous potassium hydroxide. The product was extracted with methylene chloride, dried (sodium sulfate), and the salt precipitated out ethereal hydrochloric acid. Several recrystallizations from ethanol provided the title compound (3.54 g; 38% yield) as colorless crystals, m.p. 224°-226° C.

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