Base-induced rearrangements of N-substituted 3-arylaminoisoxazol-5(2H)-ones to 2-arylaminoimidazo[1,2-a]pyridines
摘要:
New N-substituted derivatives of 2-substituted 3-phenylamino- and 3-(1-naphthyl)aminoisoxazol-5(2H)-ones were synthesized. The reaction of isoxazolones with 2-chloro-5-nitropyridine gave the corresponding isoxazolones with a nitropyridyl group substituted on N-2. Their rearrangements produced ethyl 2-arylaminoimidazo[1,2-a]pyridine-3-carboxylates in the presence of triethylamine.