Asymmetric Photocatalytic C(sp<sup>3</sup>)–H Bond Addition to α-Substituted Acrylates
作者:Zhen-Yao Dai、Zhong-Sheng Nong、Shun Song、Pu-Sheng Wang
DOI:10.1021/acs.orglett.1c00801
日期:2021.4.16
Asymmetric functionalization of inert C(sp3)–H bonds is a straightforward approach to realize versatile bond-forming events, allowing the precise assembly of molecular complexity with minimal functional manipulations. Here, we describe an asymmetric photocatalytic C(sp3)–H bond addition to α-substituted acrylates by using tetrabutylammonium decatungstate (TBADT) as a hydrogen atom transfer (HAT) photocatalyst
惰性C(sp 3)–H键的不对称官能化是实现多功能键形成事件的直接方法,可通过最少的功能操作即可精确组装分子复杂性。在这里,我们描述了不对称的光催化C(sp 3)-H键加到α-取代的丙烯酸酯上,方法是使用四丁基癸二酸铵(TBADT)作为氢原子转移(HAT)光催化剂,而手性磷酸作为手性质子转移穿梭物。该协议被认为是通过自由基/离子中继过程发生的,包括TBADT介导的HAT裂解惰性C(sp 3)–H键,1,4-自由基加成,反氢抽象和对映选择性质子化。多种惰性CH键和α-取代的丙烯酸酯均具有良好的耐受性,可从简单的原料快速合成对映体富集的α-立体异构酯。