Primary activation of <i>para</i>-quinone methides by chiral phosphoric acid for enantioselective construction of tetraarylmethanes
作者:Zhengyu Han、Biao Zhu、Yu Zang、Chaoshen Zhang、Xiu-Qin Dong、Hai Huang、Jianwei Sun
DOI:10.1039/d3sc05014a
日期:——
an effective hydrogen bond donor unit (e.g., OH, NH), here no such unit is required in the nucleophile. N-protected indole nucleophiles were successfully utilized for the synthesis of chiral tetraarylmethanes with high efficiency and enantioselectivity under mild conditions. Therefore, this protocol significantly expanded the scope of asymmetric transformations of p-QMs.
这里展示的是基于手性磷酸催化系统通过对醌甲基化物 ( p -QM) 的初级活化进行的不对称亲核加成。与之前基于CPA的双功能活化过程都需要亲核体具有有效的氢键供体单元(例如OH、NH)形成鲜明对比,这里亲核体中不需要这样的单元。 N-保护的吲哚亲核试剂成功地用于在温和条件下高效和对映选择性地合成手性四芳基甲烷。因此,该协议显着扩大了p -QM 不对称变换的范围。