ChemInform Abstract: Rearrangements of 5-Acetyl-3-benzoylamino-6-(2-dimethylamino-1-ethenyl) -2H-pyran-2-one and 3-Benzoylamino-6-(2-dimethylamino-1-ethenyl)-5- ethoxycarbonyl-2H-pyran-2-one into 1-Aminopyridine, Pyrano(2,3-b) pyridine and Isoxazole Derivatives.