Palladium-Catalyzed Direct Selanylation of Chalcogenophenes and Arenes Assisted by 2-(Methylthio)amide
作者:Gul Badshah、Carla M. B. Gomes、Sher Ali、Eduardo Q. Luz、Gabriel L. Silvério、Francielli S. Santana、Diego Seckler、Douglas B. Paixão、Paulo H. Schneider、Daniel S. Rampon
DOI:10.1021/acs.joc.3c01577
日期:2023.10.6
The direct and selective conversion of a C–H bond into a C–Se bond remains a significant challenge, which is even more intricate with substrates having an innate regioselectivity under several reaction conditions, such as chalcogenophenes. We overrode their selectivity toward selanylation using palladium, copper, and the 2-(methylthio)amide directing group. This chelation-assisted direct selanylation
C-H键直接选择性地转化为C-Se键仍然是一个重大挑战,对于在多种反应条件下具有固有区域选择性的底物(例如硫族酚)来说,这一挑战更加复杂。我们使用钯、铜和 2-(甲硫基)酰胺导向基团推翻了它们对硒酰化的选择性。这种螯合辅助的直接硒酰化也适用于芳烃的单邻位和双邻位官能化。机理研究表明催化循环中存在高价 Pd(IV) 物种、可逆的 C-H 活化步骤以及 Cu(II) 作为有机硒化物副产物的螯合剂。