δ-Cyano substituted <i>para</i>-quinone methides enable access to unsymmetric tri- and tetraarylmethanes containing all-carbon quaternary stereocenters
作者:Yue Qi、Fang Zhang、Lin Wang、Aili Feng、Rongxiu Zhu、Shutao Sun、Wei Li、Lei Liu
DOI:10.1039/d0ob00551g
日期:——
δ-position were identified as valuable 1,6-conjugate addition building blocks for acyclic all-carbon quaternary stereocenter construction. A wide variety of electron-rich arenes as nucleophiles were tolerated, effectively furnishing diverse unsymmetrical triarylmethanes bearing all-carbon quaternary stereocenters. The robust transformable abilities of the cyano group provide a platform to access other
在环外亚甲基δ位置带有吸电子氰基的对苯二甲酮甲基被鉴定为有价值的1,6-共轭加成基团,可用于无环全碳四元立体中心结构。亲核试剂可耐受多种富电子的芳烃,有效地提供了带有全碳四元立体中心的各种不对称三芳基甲烷。氰基的强大的可转化能力提供了一个平台,可以访问其他有价值的含官能团的不对称三芳基和四芳基甲烷,这些化合物否则很难制备。计算研究支持以下假设:δ位的氰基可调节分子的电子密度分布,而对醌甲基化物的稳定性可通过降低其可聚合性而得到增强。