Novel polycyclic heterocycles. XI. Synthesis of 11,12 dihydropyrido [2,1 b] [1,3] benzodiazepines, 6h pyrido[1,2 c] [1,3,5] benzoxadiazepines, and 6h pyrido[1,2 c] [1,3,5]benzothiadiazepines (1)

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