Broadly Applicable Ytterbium-Catalyzed Esterification, Hydrolysis, and Amidation of Imides
作者:Céline Guissart、Andre Barros、Luis Rosa Barata、Gwilherm Evano
DOI:10.1021/acs.orglett.8b01896
日期:2018.9.7
An efficient, broadlyapplicable, operationally simple, and divergent process for the transformation of imides into a range of carboxylic acid derivatives under mild conditions is reported. By simply using catalytic amounts of ytterbium(III) triflate as a Lewis acid promoter in the presence of alcohols, water, amines, or N,O-dimethylhydroxylamine, a broad range of imides is smoothly and readily converted
Using hydrogen peroxide as a key oxidant, catalytic oxidativeamidation between aldehydes and amines was effectively carried out with PdCl2–xantophos as a catalyst in methanol under acidic conditions. The new protocol is mechanistically different from the previous one through β-hydride elimination.
Photoredox-Catalyzed C(sp3)–H Difluoroallylation of Amides
作者:Haohua Huo、Yanmei Lin、Xiaomin Shu
DOI:10.1055/s-0043-1763660
日期:2024.6
A photoredox-catalyzed, bromine-radical-mediated C(sp3)–H difluoroallylation of amides is disclosed. This modular approach exploits the hydrogen atom transfer (HAT) ability of photooxidatively generated bromine radicals to convert both cyclic and acyclic amides into the corresponding α-amino alkyl radicals that then are coupled with readily available trifluoromethyl alkenes. This method is distinguished
公开了光氧化还原催化、溴自由基介导的酰胺的 C(sp 3 )–H 二氟烯丙基化。这种模块化方法利用光氧化产生的溴自由基的氢原子转移(HAT)能力,将环状和无环酰胺转化为相应的α-氨基烷基自由基,然后与容易获得的三氟甲基烯烃偶联。该方法的特点是条件温和、底物范围广(30 个例子),并且使用简单的 HAT 试剂,即溴化钠 (NaBr)。该策略为将羰基电子等排体掺入饱和脂肪胺中提供了一个有前途的范例。