3-(Chloromethyl)-5-(difluoromethyl)-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride
3-(Bromomethyl)-2-cyano-5-(difluoromethyl)pyridine
5-(Chloromethyl)-4-(difluoromethyl)-3-(trifluoromethoxy)pyridine-2-sulfonyl chloride
5-(Difluoromethyl)-3-iodopyridine-2-sulfonyl chloride