Generation of<i>β</i>-Carbonyl Radicals from Cyclopropanol Derivatives by the Oxidation with Manganese(III) 2-Pyridinecarboxylate and Their Reactions with Electron-Rich and -Deficient Olefins
Various β-carbonyl radicals are generated oxidatively from cyclopropanol derivatives by the use of manganese(III) 2-pyridinecarboxylate (Mn(pic)3). These β-carbonyl radicals react with electron-rich olefins such as conjugated silyl enol ethers, a ketene thioacetal, a ketene dithioacetal, and a vinyl ether intermolecularly to give crossed-addition products in good yield. Furthermore, the combined use
Generation of β-Keto Radicals from Cyclopropanols Catalyzed by AgNO<sub>3</sub>
作者:Shunsuke Chiba、Zhengyan Cao、Serry Atta Atta El Bialy、Koichi Narasaka
DOI:10.1246/cl.2006.18
日期:2006.1
Various β-keto radicals are generated from cyclopropanols by treatment with a catalytic amount of AgNO3 and (NH4)2S2O8 as a reoxidant in the presence of pyridine. Thus, generated β-keto radicals react with alkenes to yield addition products.
Expedient Synthesis of 1,5-Diketones by Rhodium-Catalyzed Hydroacylation Enabled by C–C Bond Cleavage
作者:Rui Guo、Guozhu Zhang
DOI:10.1021/jacs.7b05427
日期:2017.9.20
A rhodium-catalyzedintermolecularhydroacylationreaction of vinyl cyclobutanols with non-chelating aldehydes has been developed. This reaction offers a new and atom-economical approach for the selective preparation of 1,5-diketones in high yields. Experimental data suggest a sequential ring-opening, transfer hydrogenation, and hydroacylation mechanism. We propose that aldehyde decarbonylation is
Rh(<scp>i</scp>)-catalyzed site-selective hydroacylation of alkenyl-bearing allylic alcohols with non-chelating aldehydes controlled by <i>in situ</i> generated carbonyl group
作者:Fu-Gang Wang、Fei-Yuan Gong、Juan Cao、Ji-Cong Wang、Kai-Qiang Tian、Jinbo Zhao、Hong-Shuang Li
DOI:10.1039/d2nj04607e
日期:——
A rhodium(I)-catalyzed regioselective hydroacylation of alkenyl-bearing allylic alcohols with simple aldehydes for the preparation of diverse 1,5-diketones is described. Mechanistic investigation suggests that this transformation might proceed through redox isomerization of the allylic alcohol followed by hydroacylation of the resulting enone with aldehyde involving a stable six-membered rhodacycle
描述了一种铑 ( I ) 催化的带有烯基的烯丙醇与简单醛的区域选择性加氢酰化反应,用于制备不同的 1,5-二酮。机理研究表明,这种转化可能通过烯丙醇的氧化还原异构化,然后用醛将所得的烯酮加氢酰化,包括稳定的六元罗丹环中间体来进行。该协议强调了原位生成的羰基在控制分子内烯烃部分的位点选择性中的作用。