N-Substituted hepta(methoxycarbonyl)-3a,7a-dihydroindazoles as new sources for the generation of nitrile imines
作者:Yu. V. Tomilov、D. N. Platonov、G. P. Okonnishnikova、O. M. Nefedov
DOI:10.1007/s11172-010-0251-8
日期:2010.7
Thermal decomposition of N-substituted hepta(methoxycarbonyl)-3a,7a-dihydroindazoles proceeds through the elimination of hexamethyl benzenehexacarboxylate and results in the generation of l-aryl-3-methoxycarbonylnitrile imines, which are intercepted by both the electron-withdrawing and electron-releasing olefins, for example, methyl acrylate, cyclopentene, vinylcyclopropane, or ethyl vinyl ether, to form the corresponding pyrazolines and pyrazoles. In the presence of propan-2-ol, the main process proceeds through the addition of nitrile inline to the O—H bond to form methyl 2-isopropoxy-2-[2-(4-methoxyphenyl)hydrazono]acetate.
N-取代氮杂苯并[3a,7a]二氢吲唑的热分解通过消除六甲基苯己酸盐进行,产生l-芳基-3-甲氧基羧腈亚胺,这些亚胺会被电子吸引体和电子释放体的烯烃截留,例如甲基丙烯酸酯、环戊烯、乙烯基环丙烷或乙基乙烯醚,从而形成相应的吡唑啉和吡唑。在丙酮-2-醇存在下,主要反应通过腈与O—H键的加成反应进行,形成甲基2-异丙氧基-2-[2-(4-甲氧基苯基)肼基]乙酸酯。