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.