INVESTIGATIONS ON PREPARATION AND REACTIV ITY OF C-ANELLATED DERIVATIVES OF 1,3,4-BENZOTRIAZEPINES AND RELATED PRECURSORS N,N-COUPLED HETEROBICYCLES FROM CYCLIC HYDRAZINE DERIVATIVES .12.

c-Anellated 1,3,4-benzotriazepines are hitherto unknown. In order to s ynthesize derivatives of pyrazolo[1,2-c]- and phthalazino[2,3-c][1,3,4 ]benzotriazepines the intramolecular cyclization of N-(N-arylthiocarba moyl)-pyrazolidines and -1,2,3,4-tetrahydrophthalazines, respectively, is investigated. The latter are prepared by reaction of pyrazolidine and 1,2,3,4-tetrahydrophthalazine, respectively, with 2-functionalized phenylisothiocyanates. Often the formation of derivatives of 3,1-benz othiazines prevented by employment of suitable precursors is observed.