Semicarbazide hydrochloride → 6-(4-Fluorophenyl)-1,2,4-triazin-3(2H)-one

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Reaction Steps

A mixture of 2,2-diethoxy-1-(4-fluorophenyl)ethanone (5.15 g, 0.0228 mol), semicarbazide hydrochloride (2.6 g, 0.024 mol) in ethanol (50 mL) was stirred at RT overnight, and then heated at 80° C. for 5 h. The mixture was concentrated. The residue was dissolved in acetic acid (50 mL), and heated at 130° C. for 6 h. After cooling, the mixture was concentrated, and the residue was triturated with ethyl ether, filtered, and washed with ether and then hexane. The crystalline solid was collected and dried under high vacuum to the desired product (4.18 g, 96.1%). Analytical LCMS: (M+H)+=192.1.

Provenance & Evidence