Revisiting the Cu<sup>II</sup>-Catalyzed Asymmetric Friedel–Crafts Reaction of Indole with Trifluoropyruvate
作者:Thien Phuc Le、Kazuyuki Higashita、Shinji Tanaka、Masahiro Yoshimura、Masato Kitamura
DOI:10.1021/acs.orglett.8b03086
日期:2018.11.16
the Friedel-Crafts (FC) reaction of indole with trifluoropyruvate with high generality, yielding the highly enantiomerically enriched FC adduct. Electron-rich indoles have high reactivity due to a dual activation mechanism showing second-order kinetics for CuII, whereas indoles with a soft substituent at C(4) proceed at a rate that is three orders of magnitude lower via a coordination mechanism, which
二am基配体LS的CuII络合物具有较高的通用性,可催化吲哚与三氟丙酮酸盐的Friedel-Crafts(FC)反应,从而得到高度对映体富集的FC加合物。富含电子的吲哚具有高反应性,这是由于双重激活机制显示了CuII的二级动力学,而在C(4)处具有软取代基的吲哚通过配位机制以低三个数量级的速率进行反应,这反过来对映选择性的感觉。