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5-Bromoindazole-3-carboxylic acid

2-Ethoxyisonicotinic acid

Ethyl 2-BOC-aminothiazole-5-carboxylate

Ethyl 6-amino-5-bromonicotinate

Ethyl 2-aminoisonicotinate

Ethyl 2-aminooxazole-5-carboxylate

Ethyl 6-bromoimidazo[1,2-a)pyridine-2-carboxylate

Ethyl 2-bromooxazole-4-carboxylate

Ethyl 6-chloroimidazo[1,2-a)pyridine-2-carboxylate

Ethyl 2-chlorooxazole-5-carboxylate