4-Chlorobutyrophenone → HCID 13059487, compound

Participants

Reaction Steps

A solution of 4.0 g of 2,4-dimethyl-thiosemicarbazide and 6.7 g of 1-phenyl-4-chlorobutan-1-one in 165 ml of isopropanol is refluxed for 48 hours. The mixture is then allowed to cool to room temperature and stirred for an additional 48 hours. The solvent is evaporated, the residue is dissolved in methylene chloride, and the methylene chloride solution is washed with saturated aqueous sodium bicarbonate and with saturated aqueous sodium chloride and dried over sodium sulfate. Evaporation of the solvent leaves a brownish oil which crystallizes and is treated with hexane. The resulting greyish powder is purified by flash chromatography using 4% ethyl acetate/methylene chloride as eluent, followed by crystallization from hexane to give 5,6,7,7a-tetrahydro-1,3-dimethyl-7a-phenyl-1H-pyrrolo[1,2-b][1,2,4]triazole-2(3H)-thione as tiny colorless needles melting at about 83°-85° C.

Provenance & Evidence