The nitration and bromination of 2-(pentafluorosulfanyl)-1,3-benzothiazole and 2-(trifluoromethyl)-1,3-benzothiazole

The nitration and halogenation reactions of 2-(pentafluorosulfanyl)- and 2-(trifluoromethyl)-1,3-benzothiazoles were studied. Methods for the preparation of previously undescribed mononitro-substituted 1,3-benzothiazoles (4-nitro-2-(pentafluorosulfanyl)-1,3-benzothiazole, 4-nitro-2-(trifluoromethyl)-1,3-benzothiazole, and 6-nitro-2-(pentafluorosulfanyl)-1,3-benzothiazole) as well as a new method for the synthesis of the previously known 6-nitro-2-(trifluoromethyl)-1,3-benzothiazole were developed. The procedure involved the reaction of 2-(trifluoromethyl)-1,3-benzothiazole with NH 4 NO 3 in TFAA at room temperature. An efficient method for the preparation of 2-substituted 4,5,6,7-tetrabromo-1,3-benzothiazoles based on the reaction of 2-substituted 1,3-benzothiazoles with NBS in TFA–H 2 SO 4 at room temperature was proposed.