Synthesis of Pyrazolone Derivatives. XVII. Synthesis of a Pyrazolo [3, 4-c]-[1] benzoxepin and Pyrazolo [3, 4-c][1, 5] benzoxazepines

Abstract

The synthesis of two new type compounds which having the three ring systems, 1-methyl-2-phenyl-1, 2, 3, 10-tetrahydro-4H-pyrazolo [3, 4-c][1] benzoxepin-3, 4-dione (I), and 1-methyl-2-phenyl-1, 2, 3, 10-tetrahydro-4H-pyrazolo [3, 4-c][1, 5] benzoxazepin-3-one (II), consisting of the polyphosphoric acid cyclization or the Ullmann reaction of the appropriate pyrazolone derivatives, has been reported.