KO<sup><i>t</i></sup>Bu-Mediated Synthesis of Dimethylisoindolin-1-ones and Dimethyl-5-phenylisoindolin-1-ones: Selective C–C Coupling of an Unreactive Tertiary sp<sup>3</sup> C–H Bond
作者:Bhagat Singh Bhakuni、Abhimanyu Yadav、Shailesh Kumar、Saket Patel、Shubham Sharma、Sangit Kumar
DOI:10.1021/jo402776u
日期:2014.4.4
dihalobenzamides for the synthesis of biaryl 5-phenylisoindolin-1-ones. It seems that the reaction proceeds via a radical pathway in which the aryl radical translocates via 1,5-hydrogen atom transfer (HAT), forming a tertiary alkyl carbon-centered radical. The generated tertiary alkyl radical could attack the benzamide ring in a 5-exo/endo-trig manner followed by the release of an electron and a proton, leading to
由2-卤代-N-异丙基-N-烷基苯甲酰胺底物和KO t Bu通过不反应的叔sp 3 C-H键的选择性CC偶联,提出了一种合成二甲基异吲哚啉酮的新反应。该反应对伯或秒的sp 3 C–H叔键表现出优异的选择性碳氢键。此外,使用二卤代苯甲酰胺合成联芳基5-苯基异吲哚-1-酮可以在一锅中实现联芳基CC偶联和烷基芳基CC偶联。看来反应是通过自由基途径进行的,其中芳基通过1,5-氢原子转移(HAT)转移,形成以叔烷基碳为中心的自由基。产生的叔烷基可以5-外/内触发方式攻击苯甲酰胺环,随后释放电子和质子,从而形成五元异吲哚啉酮环。HAT似乎负责叔烷基在伯和仲CH键上的选择性官能化。