Previous transition metal-catalyzed synthesis processes of δ-diketones are plagued by the high cost of the rhodium catalyst and harsh reaction conditions. Herein a low-cost, roomtemperature ruthenium catalytic method is developed based on the coupling of α-keto sulfoxoniumylides with cyclopropanols. The mild protocol features a broad substrate scope (47 examples) and a high product yield (up to 99%)
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。
AHLBRECHT H.; DIETZ M.; WEBER L., SYNTHESIS,(1987) N 3, 251-254
作者:AHLBRECHT H.、 DIETZ M.、 WEBER L.
DOI:——
日期:——
1,5-Dicarbonyl-Verbindungen durch Michael-Addition deprotonierter Enamine und Allylamine an 2-(<i>N</i>-Methylanilino)-acrylnitril
作者:Hubertus Ahlbrecht、Manfred Dietz、Lothar Weber
DOI:10.1055/s-1987-27904
日期:——
1,5-Dicarbonyl Compounds via Michael-Addition of Deprotonated Enamines and Allylamines to 2-(N-Methylanilino) acrylonitrile A new method for the synthesis of the title compounds by a onepot, three component, coupling reaction is described. Is consists of the reaction of a homoenolate anion and an enol cation equivalent with subsequent alkylation of an acyl-anion equivalent. Hence the methodology of Umpolung is used in a threefold manner within the reaction sequence.