Generation of 1-aryl-3-methoxycarbonylnitrilimines and their reaction with halogen-containing unsaturated compounds
作者:Yu. V. Tomilov、D. N. Platonov、G. P. Okonnishnikova、R. A. Novikov、N. V. Volchkov
DOI:10.1007/s11172-012-0155-x
日期:2012.6
Thermal decomposition of 1-(4-methoxyphenyl)- and 1-(4-fluorophenyl)hepta(methoxycarbonyl)-3a,7a-dihydroindazoles at 135 °C in the presence of allyl or propargyl halides leads to the elimination of hexamethyl benzenehexacarboxylate and the formation of the corresponding pyrazolines or pyrazoles as the products of 1,3-dipolar cycloaddition of 1-aryl-3-methoxycarbonylnitrilimines to the multiple bonds
1-(4-甲氧基苯基)- 和 1-(4-氟苯基)七(甲氧基羰基)-3a,7a-二氢吲唑在烯丙基或炔丙基卤化物存在下于 135 °C 的热分解导致消除六甲基苯六羧酸酯和形成相应的吡唑啉或吡唑,作为 1-芳基-3-甲氧基羰基腈亚胺与所用底物的多重键的 1,3-偶极环加成反应的产物。在乙烯基卤化物的情况下,目标反应的产物要么以低产率获得,要么不存在,而是发生副转化。因此,例如,在 1,1-dichloro-4-methylpenta-1,3-diene 的情况下,除了六甲基苯六甲酸酯,3,5,5-trichloro-2-methylpent-4-en-2-ol 和芳基氯腙MeO2CC(Cl)=N-NHAr 也意外地作为主要产物被分离出来。