Photoredox/Cobalt-Catalyzed C(sp<sup>3</sup>)–H Bond Functionalization toward Phenanthrene Skeletons with Hydrogen Evolution
作者:Jia-Dong Guo、Xiu-Long Yang、Bin Chen、Chen-Ho Tung、Li-Zhu Wu
DOI:10.1021/acs.orglett.0c03665
日期:2020.12.18
The first example of photoredox strategy for synthesis of phenanthrene skeletons through C(sp3)–H functionalization under external oxidant-free conditions is achieved. This transformation relies on the keto–enol tautomerism of 1,3 dicarbonyl moiety, i.e., the enol form of 1,3-dicarbonyl derivatives with relatively lower oxidation potential can be activated by the excited acridinium photocatalyst. The
实现了在外部无氧化剂条件下通过C(sp 3)–H官能化合成菲骨架的光氧化还原策略的第一个例子。这种转化依赖于1,3-二羰基部分的酮-烯醇互变异构现象,即具有较低氧化电位的1,3-二羰基衍生物的烯醇形式可以通过激发的cri啶光催化剂活化。从底物上除去的电子和质子立即被钴肟催化剂捕获,从而以高至优异的产率专门提供了用于高度取代的10-菲基酚的-羰基。