Regioselective synthesis of some novel pyrazoles, isoxazoles, pyrazolo[3,4-<i>d</i>]pyridazines and isoxazolo[3,4-<i>d</i>]pyridazines pendant to benzimidazole
作者:Mohamed R. Shaaban、Ahmad M. Farag、Tamer S. Saleh、Fayez H. Osman
DOI:10.1002/jhet.5570440127
日期:2007.1
)-3-N,N-dimethylaminoprop-2-enone. The latter compound reacts regioselectively with some nitrilimines and nitrile oxides to afford the corresponding pyrazole and isoxazole derivatives, respectively. These reaction products react with hydrazine hydrate to give the novel pyrazolo[3,4-d]pyridazine and isoxazolo[3,4-d]pyridazine derivatives, respectively.
2-乙酰基-1-甲基-1H-苯并咪唑与二甲基甲酰胺-二甲基乙缩醛(DMF-DMA)反应,得到相应的E -1-(1-甲基-1H-苯并咪唑-2-基)-3- N ,N-二甲基氨基丙-2-烯酮。后一种化合物与一些亚硝胺和腈氧化物进行区域选择性反应,分别得到相应的吡唑和异恶唑衍生物。这些反应产物与水合肼反应,得到新的吡唑并[3,4- d ]哒嗪和异恶唑并[3,4- d ]哒嗪衍生物。