Visible-Light-Promoted Regioselective 1,3-Fluoroallylation of <i>gem</i>-Difluorocyclopropanes
作者:Haidong Liu、Yi Li、Ding-Xing Wang、Meng-Meng Sun、Chao Feng
DOI:10.1021/acs.orglett.0c03268
日期:2020.11.6
A strategically novel protocol for ring-opening functionalization of aryl gem-difluorocyclopropanes (F2CPs), which allows an expedient construction of CF3-containing architectures via visible-light-promoted F-nucleophilic attack manifold, was disclosed. Single electron oxidation of F2CPs was ascribed as the critical step for the success of this transformation by prompting F-nucleophilic attack, as
公开了用于芳基宝石-二氟环丙烷(F 2 CP)的开环官能化的策略上新颖的协议,其允许通过可见光促进的F-亲核攻击歧管方便地构建含CF 3的结构。F 2 CP的单电子氧化被认为是通过促进F亲核攻击以及随之而来的C–C键断裂而成功实现该转化的关键步骤。通过调用宝石-二氟取代基的阳离子稳定性质,以及通过形成CF 3获得的热力学增益,可以合理化观察到的对于该反应中的氟掺入的区域选择性。功能。通过使用经济有效的氟化试剂和易于获得的底物,可以以通常良好的收率获得广泛的结构多样化的α-烯丙基-β-三氟甲基乙苯衍生物。进一步的机械研究证明,苄基自由基中间体参与了该转化。