Rearrangements of 2-pyridyl-3-arylaminoisoxazol-5(2H)-ones to imidazo[1,2-a]pyridines under flash-vacuum-pyrolysis
2-Pyridyl-3-arylaminoisoxazol-5(2H)-ones, rearranged under flash-vacuum-pyrolysis (FVP) conditions accompanied by elimination of carbon dioxide to give imidazo[1,2-a]pyridines in high to excellent yields (85-95 %).