Ethyl 6-nitro-8-(trifluoromethyl)imidazo[1,2-a]pyridine-2-carboxylate
Ethyl 3-chloro-8-(trifluoromethyl)imidazo[1,2-a]pyridine-2-carboxylate
Ethyl 3-chloro-6-iodo-8-(trifluoromethyl)imidazo[1,2-a]pyridine-2-carboxylate
Ethyl 6-iodo-8-(trifluoromethyl)imidazo[1,2-a]pyridine-2-carboxylate