Pd(II)-Catalyzed Chemoselective Acetoxylation of C(sp<sup>2</sup>)–H and C(sp<sup>3</sup>)–H Bonds in Tertiary Amides
作者:Muniyappa Vijaykumar、Benudhar Punji
DOI:10.1021/acs.joc.1c00629
日期:2021.6.18
Palladium-catalyzed chemoselective C(sp2)–H and C(sp3)–H acetoxylation of synthetically useful tertiary amides is reported under relatively mild reaction conditions. This protocol proceeds through the assistance of a weakly coordinated directing group (C═O) and requires low catalyst (1.0 mol %) loading. Diverse functionalities, such as C(sp2)–Cl, C(sp3)–Cl, −CF3, −COOEt, and −NO2 groups, including
据报道,在相对温和的反应条件下,钯催化的化学选择性 C(sp 2 )–H 和 C(sp 3 )–H 乙酰氧基化合成有用的叔酰胺。该协议通过弱配位的导向基团 (C=O) 进行,并且需要低催化剂 (1.0 mol%) 负载。多种功能,例如 C(sp 2 )–Cl、C(sp 3 )–Cl、-CF 3、-COOEt 和-NO 2包括吗啉基、哌嗪基和吡咯烷基杂环在内的基团在反应条件下是相容的。该协议的进一步功能化通过水解为醇、醇酸以及还原为叔胺来证明。初步的动力学同位素效应研究支持限速 C-H 键活化过程。