Cu-Catalyzed Esterification Reaction via Aerobic Oxygenation and C–C Bond Cleavage: An Approach to α-Ketoesters
作者:Chun Zhang、Peng Feng、Ning Jiao
DOI:10.1021/ja4085463
日期:2013.10.9
The Cu-catalyzed novel aerobic oxidativeesterification reaction of 1,3-diones for the synthesis of α-ketoesters has been developed. This method combines C-C σ-bond cleavage, dioxygen activation and oxidative C-H bond functionalization, as well as provides a practical, neutral, and mild synthetic approach to α-ketoesters which are important units in many biologically active compounds and useful precursors
已开发出用于合成 α-酮酯的 Cu 催化的新型 1,3-二酮有氧氧化酯化反应。该方法结合了 CC σ-键裂解、双氧活化和氧化 CH 键功能化,并为 α-酮酯提供了一种实用、中性和温和的合成方法,α-酮酯是许多生物活性化合物中的重要单元和各种有用的前体。功能组转换。在机理研究的基础上提出了一个合理的激进过程。
Diacyl Disulfide: A Reagent for Chemoselective Acylation of Phenols Enabled by 4-(<i>N</i>,<i>N</i>-Dimethylamino)pyridine Catalysis
作者:Hong-Xin Liu、Ya-Qian Dang、Yun-Fei Yuan、Zhi-Fang Xu、Sheng-Xiang Qiu、Hai-Bo Tan
DOI:10.1021/acs.orglett.6b02818
日期:2016.11.4
A general and excellent acylation reagent, diacyl disulfide, was uncovered for efficient ester formation enabled by DMAP (4-(N,N-dimethylamino)pyridine) catalysis. This protocol offered a promising synthetic platform on site-selective acylation of phenolic and primary aliphatic hydroxyl groups, which greatly expanded the realm of protecting group chemistry. The importance of the reagent was also reflected
Copper-catalyzed benzylic oxidation of C(sp3)–H bonds
作者:Bo Zhang、Shou-Fei Zhu、Qi-Lin Zhou
DOI:10.1016/j.tet.2012.12.046
日期:2013.2
A selective oxidation of benzylic C(sp3)–H bonds to C(sp3)–O bonds catalyzed by copper complexes of quinoline–imine ligands was developed with peresters as oxidants under mild reaction conditions, which converted benzylic methylenes directly into benzylic alcohols and esters by means of direct C–H bond functionalization.
A protocol for the cobalt-catalyzed oxidative esterification of allylic/benzylic C(sp3)–H bonds with carboxylic acids was developed in this work. Mechanistic studies revealed that C(sp3)–H bond activation in the hydrocarbon was the turnover-limiting step and the in-situ formed [Co(III)]Ot-Bu did not engage in hydrogen atom abstraction (HAA) of a C–H bond. This protocol was successfully incorporated
在这项工作中,开发了一种用烯丙基/苄基C(sp 3)–H键与羧酸进行钴催化氧化酯化的方案。机理研究表明,碳氢化合物中的C(sp 3)-H键活化是限制周转的步骤,原位形成的[Co(III)] O t -Bu不参与氢的氢原子提取(HAA)。碳氢键。该方案已成功纳入避免使用NBS的β-大马烯酮合成途径。
Allylic Oxidation of Alkenes Catalyzed by a Copper–Aluminum Mixed Oxide
作者:Ana Leticia García-Cabeza、Rubén Marín-Barrios、F. Javier Moreno-Dorado、María J. Ortega、Guillermo M. Massanet、Francisco M. Guerra
DOI:10.1021/ol500198c
日期:2014.3.21
strategy for the allylicoxidation of cyclic alkenes with a copper–aluminum mixedoxide as catalyst is presented. The reaction involves the treatment of an alkene with a carboxylic acid employing tert-butyl hydroperoxide as the oxidant. In all cases, the corresponding allylic esters are obtained. When l-proline is employed, the allylic alcohol or ketone is obtained. The oxidation of cyclohexene and