Divergence in Ynone Reactivity: Atypical Cyclization by 3,4-Difunctionalization versus Rare Bis(cyclization)
作者:Benito Alcaide、Pedro Almendros、Carlos Lázaro-Milla、Patricia Delgado-Martínez
DOI:10.1002/chem.201800630
日期:2018.6.7
yields in a totally selective manner. In this way, bis(triflyl)flavones, bis(triflyl)thioflavones, bis(triflyl)selenoflavones, (triflyl)benzothienopyrans, (triflyl)benzoselenophenopyrans, (triflyl)vinyl aurones, and (triflyl)pyranoindoles were constructed. Conceivable mechanistic pathways were suggested on the basis of the isolation of several intermediates and the results from control experiments
可以通过Tf 2 C = CH 2激活功能化的炔酮,原位生成,形成两性离子物质。这些物种以分子内方式被数个亲核试剂捕获,以发散的方式产生两种主要类型的三苯甲酮。通过对反应温度的微调,以完全选择的方式以合理的收率获得了双(triflyl)-6元或(triflyl)-5元稠合杂环。以此方式,构建了双(三氟乙)黄酮,双(三氟乙)硫代黄酮,双(三氟乙)硒代黄酮,(三氟乙)苯并噻吩并吡喃,(三氟苯)苯并硒基苯并吡喃,(三氟乙)乙烯基金酮和(三氟乙)吡喃并吲哚。根据几种中间体的分离和对照实验的结果,提出了可能的机理途径。