Bu<sub>4</sub>NI-Catalyzed α-Oxyacylation of Carbonyl Compounds with Toluene Derivatives
作者:Chengliang Li、Tao Jin、Xinglu Zhang、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1021/acs.orglett.6b00749
日期:2016.4.15
A TBAI (tetrabutylammonium iodide)-catalyzed direct α-oxyacylation of carbonylcompounds from readily available toluene derivatives has been developed. The distinguished features of this metal-free protocol include the employment of simple starting material, a wide carbonylcompound scope, and mild reaction conditions.
Abstract The 1,2-dibromoethane- and KI-mediated α-acyloxylation of ketones is reported in moderate to good yield without the use of transition metals and strong oxidants. Various acids are well tolerated with wide functional group compatibility. An 1,2-dibromoethane- and KI-catalysed reaction mechanism is proposed based on the results of control experiments.
Synthesis of α-heterosubstituted ketones through sulfur mediated difunctionalization of internal alkynes
作者:Zhong Zhang、Yuzheng Luo、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1039/c9sc00568d
日期:——
Synthesis of α-heterosubstituted ketones was achieved through sulfur mediated difunctionalization of internal alkynes in one pot. The reaction design involves: phenyl substituted internal alkyne attacking triflic anhydride activated diphenyl sulfoxide to give a sulfonium vinyl triflate intermediate, hydrolysis to give an α-sulfonium ketone, and then substitution with various nucleophiles. This method
Herein, a copper/TBHP catalyst system for the α-C–H acyloxylation of carbonyl compounds is developed using terminal alkynes as the acyloxy source. A variety of carbonyl compounds and terminal alkynes are tolerated in this reaction. In addition, its possible mechanism is proposed.
One-pot synthesis of α-acyloxycarbonyl compounds via oxidative decarboxylation coupling reaction of α-oxo carboxylic acids with carbonyl compounds
作者:Li-Ming Chang、Gao-Qing Yuan
DOI:10.1016/j.tet.2016.09.031
日期:2016.11
With tetrabutylammonium iodide (TBAI) as the catalyst and tert-butyl hydroperoxide (TBHP) as the oxidant, a simple metal-free protocol has been developed for the synthesis of α-acyloxycarbonyl compounds from carbonylcompounds and α-oxo carboxylic acids via decarboxylative coupling reaction. The target products could be obtained in moderate to high yields.