PROCESS FOR THE PREPARATION OF S-TRIAZOLO(3,4-B)BENZOTHIAZOLES

摘要

Title compds. (I; R = hydrogen, C1-11 alkyl, cyclopropyl, trifluoromethyl, R1 = H, Br, C1, or F; R2, R3 = C1-2 alkyl, C1-3 alkoxy, Br, C1, F or trifluoromethyl) were prepod. by reaction of 1acyl-4-(o-halophenyl)-3-thiosemicarbazide with base in the presence of anhydrous amide solvent. Thus, 2.4g 1-acetyl-4-(2-chlorophenyl) thiosemicarbazide was melted with 50ml DMF under N and added with 0.5g sodium hydride followed by refluxing for 126 hr to give 400mg 3-methyl-S-thiazole [3,4-b benzothiazole.