Synthesis of О-2-(acyl)vinylketoximes and their unusual rearrangements into 2- and 3-acyl-substituted pyrroles
作者:Tatyana E. Glotova、Elena Yu. Schmidt、Marina Yu. Dvorko、Igor’ A. Ushakov、Al’bina I. Mikhaleva、Boris A. Trofimov
DOI:10.1016/j.tetlet.2010.09.101
日期:2010.11
yields) rearrange upon heating (125–150 °C) to give 2- or 3-acylpyrroles, wherein the positions of the acyl substituents do not correspond to known O-vinyloxime rearrangements; the chemo- and regioselectivity of the rearrangements depend on the reaction conditions. The described rearrangement enables syntheses of previously inaccessible substituted 2- or 3-acylpyrroles.
О- 2-(酰基)乙烯基酮肟(由酮肟和酰基乙炔在Ph 3 P作为催化剂的情况下以83%的产率新鲜制备)在加热(125–150°C)时重新排列,得到2-或3-酰基吡咯,其中酰基取代基的位置不对应于已知的O-乙烯基肟重排;重排的化学和区域选择性取决于反应条件。所描述的重排使得能够合成先前难以获得的取代的2-或3-酰基吡咯。