摘要:
A novel bicyclic ring, pyrazolo [3, 4-b] [1, 4] oxazepine was synthesized. The Mannich reaction of 3-hydroxy-5-methyl-1-phenyl pyrazole (I) with p-substituted aniline gave 3-hydroxy-5-methyl-1-phenyl-4-(p-substituted anilino) methyl pyrazoles (II, III, IV, V), which were reacted with chloroacetyl chloride to give 3-methyl-2-phenyl-5-(p-substituted)-phenyl-4, 5, 6, 7-tetrahydro-2H-pyrazolo [3, 4-b] [1, 4] oxazepin-6-ones (VI, VII, VIII, IX). The reduction of VI, VII, and VIII with lithium aluminum hydride gave 3-methyl-2-phenyl-5-(p-substituted) phenyl-4, 5, 6, 7-tetrahydro-2H-pyrazolo [3, 4-b] [1, 4] oxazepines (X, XI, XII) and ring-opened products (XIII, XIV, XV).