[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([C:15](=O)[CH2:16]Br)=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH:19]([NH2:21])=[S:20]>C(O)C>[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([C:15]2[N:21]=[CH:19][S:20][CH:16]=2)=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1A mixture of 4'-benzyloxy-2-bromoacetophenone (3.0 g) and thioformamide (0.63 g) in ethanol (50 ml) was refluxed under heating for 30 minutes. The reaction mixture was poured into ice-water, and the precipitating crystals were collected by filtration, extracted with diethyl ether and purified by column chromatography on silica gel [eluting solvent: methylene chloride-hexane (1:9)] to give 4-(4-benzyloxyphenyl) thiazole (720 mg, 27.7%), which was further purified by recrystallization from diethyl ether-hexane. m.p. 109°-110° C.
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