Visible-light-mediated photocatalytic cross-coupling of acetenyl ketones with benzyl trifluoroborate
作者:Lingchun Zhang、Yanle Chu、Peizhi Ma、Shujuan Zhao、Qiaoyan Li、Boya Chen、Xuejiao Hong、Jun Sun
DOI:10.1039/c9ob02624j
日期:——
In this report, we describe a simple visible light-triggered Barbier-type reaction by employing acetenyl ketones with benzyl trifluoroborates. Through a radical-radical cross-coupling process, this photocatalytic protocol furnished a wide range of tertiary propargyl alcohols. Mechanistic investigation indicated that proton-coupled electron transfer (PCET) might be involved in the photochemical transformations
calcium‐catalyzed direct reduction of propargylic alcohols and ethers has been accomplished by using triethylsilane as a nucleophilic hydride source. At room temperature a variety of secondary propargylic alcohols was deoxygenated to the corresponding hydrocarbons in excellent yields. Furthermore, for the first time, a catalytic deoxygenation of tertiary propargylic alcohols was generallyapplicable. The
A mild and practical oxyarylation of alkenes by oxidative radical addition has been developed by using aerobic oxidation of hydrazine compounds. The use of a catalytic amount of potassiumferrocyanidetrihydrate (K4[Fe(CN)6]⋅3 H2O) and water accelerated this radical reaction to give peroxides or alcohols from simple alkenes in good yields. The environmentally friendly and economical radical reactions