Visible-Light-Driven Organophotocatalyzed Mono-, Di-, and Tri-C(sp<sup>3</sup>)–H Alkylation of Phosphoramides
作者:Krishna Gopal Ghosh、Debabrata Das、Palasetty Chandu、Devarajulu Sureshkumar
DOI:10.1021/acs.joc.0c02695
日期:2021.2.5
mono-α-C(sp3)–H alkylation of phosphoramide derivatives. Remarkably, di- and tri-C(sp3)–H alkylation of phosphoramides and thiophosphoramides using an acridinium photocatalyst is reported with good yield and selectivity. Mechanistic studies reveal that monoalkylation of phosphoramides by Eosin-Y follows the HAT mechanism, whereas di- and tri-C(sp3)–H alkylation by the acridinium photocatalyst follows
在环境良性条件下,证明了无光催化金属,可见光驱动,高度原子经济的磷酰胺和硫代磷酰胺的直接多个α-C(sp 3)-H烷基化。经济上可行且可商购的曙红-Y用作磷酰胺衍生物的单α-C-(sp 3)-H烷基化的HAT光催化剂。值得注意的是,据报道,使用a啶光催化剂的磷酰胺和硫代磷酰胺的二-和三-C(sp 3)-H烷基化具有良好的收率和选择性。机理研究表明,曙红Y引起的磷酰胺单烷基化遵循HAT机理,而cri啶光催化剂进行的二-和三C(sp 3)-H烷基化遵循SET机理。