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 α-acyloxylation reaction of ethers and ketones with aldehydes and tert-butyl hydroperoxide
作者:Feng Zhu、Zhong-Xia Wang
DOI:10.1016/j.tet.2014.11.002
日期:2014.12
The reaction of (hetero)aromatic aldehydes or cinnamaldehyde with di-/multi-ethers in the presence of Bu4NI and tert-butylhydroperoxide generated corresponding α-acyloxy ethers. Reactions between (hetero)aromatic aldehydes or cyclohexanecarbaldehyde with arylalkyl ketones under similar conditions resulted in α-acyloxy ketones. Collectively, Bu4NI-catalyzed α-acyloxylation reactions exhibit a broad
esterification of un-reactive C(sp3)-H bond of cyclic ether and carboxylic acid via cross dehydrogenative coupling (CDC) reaction using di-tert-butyl peroxide (DTBP) as oxidant. A wide range of carboxylic acids can react with cyclic ether with good to excellent yields, showing copper corrole is a new kind of promising catalyst for CDC reaction. Under gram-level test, the turnover number (TON) may achieve 8400
Iron porphyrin-catalyzed C(SP3) -H activation for the formation of C O bond via cross-dehydrogenative coupling of cycloether and aromatic acid
作者:Wei-Hong Wen、An-Na Xie、Hua-Hua Wang、Dong-Xu Zhang、Atif Ali、Xiao Ying、Hai-Yang Liu
DOI:10.1016/j.tet.2017.10.046
日期:2017.12
achieved by using ironporphyrin as the catalyst and di-tert-butyl peroxide oxidant. The benzoic acid substrates bearing electron donating or withdrawing groups could react with cyclic ether smoothly to afford the desired products. It was found ironporphyrin catalyzed oxidative C (sp3)-H activating esterification had the advantage of short reaction time and low catalyst loading. The reaction had been proved
Ultrasound-promoted synthesis of a copper–iron-based catalyst for the microwave-assisted acyloxylation of 1,4-dioxane and cyclohexene
作者:Pablo Macías-Benítez、Alfonso Sierra-Padilla、M. Pilar Yeste、José María Palacios-Santander、Laura Cubillana-Aguilera、José M. Gatica、Hilario Vidal、Francisco M. Guerra、F. Javier Moreno-Dorado
DOI:10.1039/d2ob02117j
日期:——
A copper–iron-based catalyst has been prepared by a low-temperature co-precipitation and sonication method. The use of high-energy ultrasound reduces the time required for the preparation process from one workweek to one day with respect to the catalysts obtained by conventional coprecipitation and thermal treatment methods. The resulting material has been characterized at compositional, textural, structural