[F:1][C:2]1[CH:10]=[CH:9][C:5]([C:6](Cl)=[O:7])=[CH:4][CH:3]=1.[Cl-].[Al+3].[Cl-].[Cl-].[CH3:15][C:16]1[NH:17][C:18](=[O:21])[S:19][CH:20]=1.Cl>ClCC(Cl)(Cl)Cl>[F:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([C:20]2[S:19][C:18](=[O:21])[NH:17][C:16]=2[CH3:15])=[O:7])=[CH:4][CH:3]=1
4-Fluorobenzoyl chloride (25.3 g, 0.16 mol) was added dropwise to a mixture of aluminum chloride (60 g, 0.45 mol) and 4-methyl-2(3H)-thiazolone (17.3 g, 0.15 mol) in tetrachloroethane (200 ml). After the addition was complete, the mixture was stirred for 5 hours at 90° C. After the mixture cooled to room temperature, 2N hydrochloric acid (200 ml) was added dropwise. The resulting precipitate was collected, washed with water and then with dichloromethane. The solid was then dissolved in ethanol and heated with charcoal. Subsequent recrystalization from ethanol gave the title compound (18.4 g), M.p. 209°-210° C.
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