Three novel pyrido-fused tris-heterocycles have been prepared based on a Suzuki coupling and subsequent cyclisation approach. Pyrido[4,3-e]pyrrolo[2,3-c]pyridazine (3b, 77%) and pyrido[4,3-e]furano[2,3-c]pyridazine (5b, 76%) were obtained by intramolecular diazocoupling. Successful diazocoupling of furan (5b) is thus reported for the first time by NOBF4 generation of the diazonium intermediate. N-TIPS-pyrido[3
基于铃木偶联和随后的环化方法,已经制备了三种新颖的
吡啶基-稠合的三杂环。
吡啶[4,3- e ]
吡咯并[2,3- c ]
哒嗪(3b,77%)和
吡啶[4,3- e ]
呋喃基[2,3- c ]
哒嗪(5b,76%)通过分子内重氮偶联。因此,首次报道了重氮中间体的NOBF 4生成成功地使
呋喃(5b)重氮化成功。N -
TIPS-
吡啶并[3,4- b ]
吡咯并[3,2- d ]
吡咯(
TIPS-4b由于
TIPS活化,通过
吡啶环氮烯的热环化反应合成了),产率比先前从类似环化反应中获得的产率高得多(71%)。