Synthesis of 2-sulfenylindenones by visible-light-mediated addition of sulfur-centered radicals to 1,3-diarylpropynones
作者:Chengqun Chen、Qian Xiong、Jie Wei
DOI:10.1080/00397911.2019.1580744
日期:2019.3.19
Abstract A novel, visible-light-mediated method for the synthesis of 2-sulfenylindenones from easily available thiophenols (2.0 equiv.) and 1, 3-diarylpropynones (1.0 equiv.) in the presence of eosin Y (0.02 equiv.) under air atmosphere has been developed. The reaction proceeded smoothly, for a wide range of derivatives of thiophenols and 3-diarylpropynones, to give the expected products in moderate
The metal-free oxidative alkene methylation/alkynylation of 1,4-enyn-3-ols with an organic peroxide as the methyl source has been developed, which provides straightforward and practical access to the challenging quaternary-carbon-containing but-3-yn-1-ones. The method is reasoned to go through methylation of functional alkenes utilizing dicumyl peroxide as the methylating reagent and subsequent intermolecular
3-exo-dig cyclization with 1,2-alkynyl migration of 1,4-enynes with simple cycloalkanes was established, enabling C–C breaking and reconstruction to access a wide range of α-alkynyl ketones with generally good yields by FeCl2/di-tert-butyl peroxide (DTBP) as a catalytic oxidation system. Radical-induced C(sp3)–H functionalization of cycloalkanes was realized, leading to the direct formation of C(sp3)–C(sp3)
Substituent-Controlled Chemoselective Cleavage of C═C or C<sub>sp<sup>2</sup></sub>–C(CO) Bond in α,β-Unsaturated Carbonyl Compounds with H-Phosphonates Leading to β-Ketophosphonates
作者:Yao Zhou、Changqing Rao、Shaoyu Mai、Qiuling Song
DOI:10.1021/acs.joc.5b02887
日期:2016.3.4
An unprecedented substituent-controlled chemoselectivecleavage of C═C double bond or C(sp2)–C(CO) bond along with aerobic phosphorylation of α,β-unsaturated carbonyl compounds with H-phosphonates through a radical process has been disclosed. The current strategy provides an access to β-ketophosphonates under mild conditions with a wide substrate scope.
Synthesis of α,β-alkynyl ketones <i>via</i> the nickel catalysed carbonylative Sonogashira reaction using oxalic acid as a sustainable C1 source
作者:Shaifali Shaifali、Shankar Ram、Vandna Thakur、Pralay Das
DOI:10.1039/c9ob01064e
日期:——
An efficient and economic nickel-dppb catalyzed, carbonylative Sonogashira cross-coupling reaction was demonstrated to providerapidaccess to various α,β-alkynyl ketones from aryl iodides and terminal alkynes using oxalic acid as the ex situ C1 source in a double vial (DV) system. Notably, the role of the ligand in combination with the Ni catalyst for the selective formation of carbonylative Sonogashira