Copper catalyzed cross-coupling reactions of carboxylic acids: an expedient route to amides, 5-substituted γ-lactams and α-acyloxy esters
作者:S. Priyadarshini、P. J. Amal Joseph、M. Lakshmi Kantam
DOI:10.1039/c3ra41000e
日期:——
A convenient and recyclable catalytic protocol for the synthesis of N,N-dimethyl substituted amides, 5-substituted γ-lactams and α-acyloxy ethers from carboxylic acids using CuO nanoparticles and TBHP is described.
Dimethylzinc‐Initiated Radical Coupling of β‐Bromostyrenes with Ethers and Amines
作者:Amanda Sølvhøj、Andreas Ahlburg、Robert Madsen
DOI:10.1002/chem.201502429
日期:2015.11.2
A new coupling reaction has been developed in which β‐bromostyrenes react with ethers and tertiary amines to introduce the styryl group in the α‐position. The transformation is mediated by Me2Zn/O2 with 10 % MnCl2 and is believed to proceed by a radical addition–elimination mechanism. The ether and the amine are employed as solvent and the coupling takes place through the most stable α radical for unsymmetrical
已开发出一种新的偶联反应,其中β-溴苯乙烯与醚和叔胺反应,在α-位引入苯乙烯基。该转变是由具有10%MnCl 2的Me 2 Zn / O 2介导的,并且据认为是通过自由基加成-消除机理进行的。醚和胺用作溶剂,偶合通过非对称底物的最稳定的α基团发生。获得的产物为纯E异构体,产率中等至良好。可以使用一系列较小的环状和非环状醚/胺以及各种取代的β-溴苯乙烯实现偶联。
Silver-catalyzed decarboxylative C(sp<sup>2</sup>)–C(sp<sup>3</sup>) coupling reactions <i>via</i> a radical mechanism
作者:Zhongxue Fang、Chenlong Wei、Jing Lin、Zhenhua Liu、Wei Wang、Chenshu Xu、Xuemin Wang、Yu Wang
DOI:10.1039/c7ob02455j
日期:——
A silver catalyzed decarboxylative C(sp2)–C(sp3) coupling of vinylic carboxylic acids with alcohols, alkylbenzenes, cycloalkanes and cyclic ethers was developed by using DTBP as an oxidant. This reaction tolerates a wide range of substrates, and products are obtained in good to excellent yields. The reaction also shows good stereoselectivity, and only trans-isomers are obtained. In addition, a radical
NiCl2-catalyzed radical cross decarboxylative coupling between arylpropiolic acids and cyclic ethers
作者:Zi-juan Wan、Jin-yuan Wang、Jun Luo
DOI:10.1016/j.tetlet.2019.01.039
日期:2019.2
A direct alkenylation of cyclic ethers via radical cross decarboxylative coupling process catalyzed by NiCl2 and using DTBP as radicalinitiator and oxidant was developed. A variety of arylpropiolic acids and cyclic ethers were transformed into the corresponding 2-arylvinyl cyclic ethers in moderate to excellent yields. Mechanistic experiments were conducted to determine the nature of the reaction
Rhenium-catalyzed dehydrogenative olefination of C(sp<sup>3</sup>)–H bonds with hypervalent iodine(<scp>iii</scp>) reagents
作者:Haidong Gu、Congyang Wang
DOI:10.1039/c5ob00619h
日期:——
dehydrogenative olefination of C(sp3)–H bonds is disclosed here, by merging rhenium catalysis with an alanine-derived hypervalentiodine(III) reagent. Thus, cyclic and acyclic ethers, toluene derivatives, cycloalkanes, and nitriles are all successfully alkenylated in a regio- and stereoselective manner.