Broad-Scope Rh-Catalyzed Inverse-Sonogashira Reaction Directed by Weakly Coordinating Groups
作者:Eric Tan、Ophélie Quinonero、M. Elena de Orbe、Antonio M. Echavarren
DOI:10.1021/acscatal.7b04395
日期:2018.3.2
We report the alkynylation of C(sp2)-H bonds with bromoalkynes (inverse-Sonogashira reaction) directed by synthetically useful ester, ketone, and ether groups under rhodium catalysis. Other less common directing groups such as amine, thioether, sulfoxide, sulfone, phenol ester, and carbamate are also suitable directing groups. Mechanistic studies indicate that the reaction proceeds by a turnover-limiting
我们报道了在铑催化下,由合成有用的酯、酮和醚基团引导的 C(sp2)-H 键与溴代炔的炔基化(逆 Sonogashira 反应)。其他不太常见的定向基团例如胺、硫醚、亚砜、砜、酚酯和氨基甲酸酯也是合适的定向基团。机理研究表明,该反应通过亲电型取代通过限制周转的 CH 活化步骤进行。