Visible-Light-Induced Sulfur-Alkenylation of Alkenes
作者:Qi Xu、Xiaoxuan Zhou、Si Zhang、Ling Pan、Qun Liu、Yifei Li
DOI:10.1021/acs.orglett.1c01596
日期:2021.6.18
proceed in a highly regio- and stereospecific manner involving the visible-light-induced conversion of a ketene dithioacetal to the thiavinyl 1,3-dipole intermediate, followed by a formal [3 + 2] cycloaddition and C–S bond cleavage. Furthermore, it is also an efficient approach for the late-stage functionalization of natural products and complex molecules, even being induced by sunlight under ambient
Iron(III) Chloride Promoted Desulfitative C–C Coupling Reaction of α-Oxo Ketene Dithioacetals and Indoles: Highly Selective Synthesis of β,β-Bisindolyl and β-Indolyl α,β-Unsaturated Carbonyl Compounds
作者:Haifeng Yu、Tiechun Li、Peiqiu Liao
DOI:10.1055/s-0032-1317691
日期:——
Abstract The iron(III) chloridepromoted desulfitative C–C coupling of α-oxo ketene dithioacetals with indoles was developed for the synthesis of indole derivatives. In the presence of iron(III) chloride, α-oxo ketene dithioacetals reacted efficiently and highly selectively with C2-unsubstituted or C2-substituted indoles to afford excellent yields of β,β-bisindolyl or β-indolyl α,β-unsaturated carbonyl
FeCl3·6H2O-Catalyzed Tandem Alkylation–Hydrolysis Reaction of Chain α-Oxo Ketene Dithioacetals with Alcohols: Efficient Synthesis of α-Alkylated β-Oxo Thioesters
A novel FeCl3·6H2O-catalyzed tandem Friedel–Crafts alkylation–hydrolysis reaction between chain α-oxo ketene dithioacetals and alcohols to afford α-alkylated β-oxo thioesters has been successfully developed. The reaction is efficient in the presence of catalyst loading as low as 30 mol% in MeCN at roomtemperature, and a wide variety of α-alkylated β-oxo thioesters are efficiently synthesized in good
Iodine-Mediated Copper-Catalyzed Efficient<i>α</i>-C(<i>sp</i><sup>2</sup>)-Thiomethylation of<i>α</i>-Oxoketene Dithioacetals with Dimethyl Sulfoxide in One Pot
The direct α-Csp2H functionalization and thiomethylation of α-oxoketene dithioacetals (DTAs) has been accomplished with dimethylsulfoxide (DMSO) in the presence of iodine and a copper(I) salt for the first time. A prerequisite is the in situ iodination of the α-Csp2 atom of dithioacetals that could offer other reaction channels. The operationally simple one-pot protocol includes region-defined consecutive
Extended Version of the Corey–Chaykovsky Reaction: Synthesis of 2,4-Substituted Furans by the Treatment of β-Dialkylamino Chalcones with Dimethylsulfonium Methylide
作者:Roman O. Shcherbakov、Danil A. Myasnikov、Igor V. Trushkov、Maxim G. Uchuskin
DOI:10.1021/acs.joc.3c00203
日期:2023.7.7
We describe the synthesis of functionalized furans using the concept of the extended Corey–Chaykovsky reaction. Namely, β,β-disubstituted α,β-unsaturated ketones were treated with dimethylsulfonium methylide to give vinyloxiranes, which immediately rearranged into the corresponding furans. The developed approach allows for synthesizing a broad range of unsymmetrically di- and trisubstituted furans