by Pd-catalyzed C(sp3)–H bond functionalization was developed. Using a bidentate directing group, the direct and selective introduction of a SCF3 moiety was possible on a range of amides with remarkable selectivity for C(sp3)-centers with an electrophilic SCF3 source and pivalic acid as an additive. This work constitutes an example of the unactivated C(sp3)–SCF3 bond formation by C–Hactivation offering
Selective C–C bond cleavage of amides fused to 8-aminoquinoline controlled by a catalyst and an oxidant
作者:Sen Li、Kun Jie、Wenjie Yan、Qingjun Pan、Min Zhang、Yufeng Wang、Zhengjiang Fu、Shengmei Guo、Hu Cai
DOI:10.1039/d0cc04960c
日期:——
Herein, copper-catalyzed direct C–C bond cleavage of amides fused to 8-aminoquinoline as a directing group to form urea in the presence of amines and dioxygen is reported. Compared to the previous C–H aminations of amides via C–H activation, this reaction presents a catalyst and oxidant controlled C–C bond cleavage strategy that enables amidation through a radical process. CuBr/Ag2CO3/O2 shows the
在本文中,据报道,在胺和双氧存在下,铜与8-氨基喹啉作为导向基团形成酰胺的铜催化直接C–C键裂解。与以前的通过C–H活化进行酰胺化的C–H胺相比,该反应提出了催化剂和氧化剂控制的C–C键裂解策略,可通过自由基过程进行酰胺化。CuBr / Ag 2 CO 3 / O 2在150°C下表现出最好的催化效果。一系列的芳基和烷基酰胺与该转化相容。值得注意的是,该方法提供了获得最重要的工业材料之一环己酮的途径。研究了该反应的途径。
Orthogonal Selectivity in C–H Olefination: Synthesis of Branched Vinylarene with Unactivated Aliphatic Substitution
Oxidative coupling is a useful tool to synthesize vinylarenes. Despite remarkable successes in linear vinylarene, branched vinylarene synthesis has remained underdeveloped. Overcoming this limitation, herein, we report a chelation-assisted oxidative coupling to generate branched olefinated product in high yield. Exclusive branched selectivity was obtained using alkenyl carboxylic acid. Detailed experimental
Stereoselective Synthesis of β-Alkylated α-Amino Acids via Palladium-Catalyzed Alkylation of Unactivated Methylene C(sp<sup>3</sup>)–H Bonds with Primary Alkyl Halides
作者:Shu-Yu Zhang、Qiong Li、Gang He、William A. Nack、Gong Chen
DOI:10.1021/ja406484v
日期:2013.8.14
We report a new set of reactions based on the Pd-catalyzed alkylation of methylene C(sp(3))-H bonds of aliphatic quinolyl carboxamides with α-haloacetate and methyl iodide and applications in the stereoselective synthesis of various β-alkylated α-amino acids. These reactions represent the first generally applicable method for the catalytic alkylation of unconstrained and unactivated methylene C-H bonds
Palladium-Catalyzed C–H Functionalization of Aryl Acetamides and Benzoquinones: Synthesis of Substituted Aryl Quinones
作者:Ananya Dutta、Masilamani Jeganmohan
DOI:10.1021/acs.joc.2c01625
日期:2022.10.7
An efficient synthesis of aryl-substituted quinones via Pd(II)-catalyzed C–H functionalization of less expensive and abundant benzoquinones with aryl acetamides is demonstrated. An auxiliary ligand N,N-bidentate-directing group 8-aminoquinoline plays a crucial role in the success of the reaction. A broad range of substituted phenyl acetamides including commercially available drug molecules were examined