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.
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
Acyloxylation of 1,4-Dioxanes and 1,4-Dithianes Catalyzed by a Copper–Iron Mixed Oxide
作者:Ana Leticia García-Cabeza、Rubén Marín-Barrios、F. Javier Moreno-Dorado、María J. Ortega、Hilario Vidal、José M. Gatica、Guillermo M. Massanet、Francisco M. Guerra
DOI:10.1021/acs.joc.5b01043
日期:2015.7.2
The use of a copper–iron mixed oxide as a heterogeneous catalyst for the efficient synthesis of α-acyloxy-1,4-dioxanes and 1,4-dithianes employing t-butyl peroxyesters is reported. The preparation and characterization of the catalyst are described. The effect of the heteroatoms and a plausible mechanism are discussed. The method is operationally simple and involves low-cost starting materials affording
Iron-Catalyzed Cross-Dehydrogenative Coupling Esterification of Unactive C(sp<sup>3</sup>)–H Bonds with Carboxylic Acids for the Synthesis of α-Acyloxy Ethers
作者:Jincan Zhao、Hong Fang、Wei Zhou、Jianlin Han、Yi Pan
DOI:10.1021/jo500192h
日期:2014.5.2
An iron-catalyzed oxidative esterification reaction between unactivated C(sp3)–H bonds from symmetric and asymmetric ethers and carboxylic acids using di-tert-butyl peroxide (DTBP) as the oxidant via a crossdehydrogenativecoupling (CDC) reaction was established, which tolerates a wide range of cyclic ether substrates to react with aromatic acids and phenylacetic acid, providing an efficient method
six-coordinate structure. An efficient copper porphyrin-catalyzed cross-dehydrogenativecoupling (CDC) esterification reaction between C(sp3)–H and carboxylic acids using di-tert-butyl peroxide (DTBP) as an oxidant was established. The kinetic isotope effect (KIE) indicated that C(sp3)–H bond cleavage was the rate-determining step of this CDCreaction.