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.
Microwave-Enhanced Coupling of Carboxylic Acids with Liquid Ketones and Cyclic Ethers Using Tetrabutylammonium Iodide/<i>t</i>-Butyl Hydroperoxide
作者:Pablo Macías-Benítez、F. Javier Moreno-Dorado、Francisco M. Guerra
DOI:10.1021/acs.joc.0c00519
日期:2020.5.1
The oxidative coupling of carboxylic acids with liquid ketones and cyclic ethers has been accomplished in minutes using t-butylhydroperoxide in the presence of tetrabutylammonium iodide under microwave irradiation in the absence of a solvent. In addition to drastically shortening the reaction times, the use of microwaves resulted, in general, in yields equal to or higher than those obtained by conventional
A direct esterification of α-alkoxy alkanes with acids is reported under transition-metal-free conditions mediated by NCS with a broad substrate generality.
Bu4NI-catalyzed decarboxylative acyloxylation of an sp3 C–H bond adjacent to a heteroatom with α-oxocarboxylic acids
作者:Shuai Zhang、Li-Na Guo、Hua Wang、Xin-Hua Duan
DOI:10.1039/c3ob40748a
日期:——
A novel metal-free decarboxylative acyloxylation of an sp3 CâH bond in formamides and ethers has been explored. A variety of N-acyloxymethylamides and α-acyloxy ethers could be easily synthesized by this method. Preliminary mechanistic studies have shown that the reaction proceeded via a radical process.
A practical and efficient construction of C–O bonds via oxidative cross-coupling reaction of aldehydes and ethers has been realized under open air. When 2 mol% copper was used as the catalyst, various α-acyloxy ethers were obtained with up to 93% isolated yield.