1,3-Dipolar cycloaddition of 2-diazopropane to 2-methyl-6-phenylpyridazin- 3(2H)-one. The formation of pyrazolo/3,4-D/pyridazine derivatives
作者:Anton Stimac、Branko Stanovnik、Miha Tisler、Ljubo Golic
DOI:10.1016/s0040-4020(01)87879-0
日期:1990.1
cycloadduct and rearranged NH,NH- dihydro cycloadduct were isolated. They were transformed, dependent on the reaction conditions into 1,2-di- azepine derivative, 4-isopropyl substituted pyridazine derivative, diazabicyclo/4.l.0/heptenone derivative and pyrazolo/3,4-d/pyridazine derivative. 1,5- Sigmatropic rearrangements were observed, when was heated in PPA or concentrated sulphuric acid to give pyrazolo/3
在区域特异性的2-重氮丙烷的1,3-偶极环加成反应中,分离出2-重氮基-6-苯基哒嗪-3(2H)-基中的一级环加合物和重排的NH,NH-二氢环加合物。根据反应条件,将它们转化为1,2-二-氮杂pine衍生物,4-异丙基取代的哒嗪衍生物,二氮杂双环/4.1.0/庚酮衍生物和吡唑并/ 3,4-d /哒嗪衍生物。在PPA或浓硫酸中加热后,观察到1,5-σ重排,得到吡唑并/ 3,4-d /哒嗪衍生物和,以及吡唑衍生物。