作者:Zhenhua Zhang、Yiyang Liu、Mingxing Gong、Xiaokun Zhao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.200906349
日期:2010.2.1
On the move: A palladium‐catalyzed reaction of aryl iodides, diazo compounds or N‐tosylhydrazones, and carbon monoxide affords β‐oxo esters or ketones/enones (see scheme; DCE=1,2‐dichloroethane). The products are delivered with high efficiency through the title sequence.
Decarboxylative Claisen Condensations with Substituted Malonic Acid Half Oxyesters
作者:Marc Presset、Tania Xavier、Parvine Tran、Apolline Gautreau、Erwan Le Gall
DOI:10.1055/a-1950-5110
日期:2023.2
A decarboxylative Claisen condensation involving substituted malonicacid half oxyesters (SMAHOs) as pronucleophiles has been developed. The addition of their magnesium enolates to various acyl donors allows the synthesis of functionalized α-substituted β-keto esters in moderate to excellent yields (13–96%). In addition to acyl chlorides and acid anhydrides, these conditions proved efficient for the
Hydroaroylation of methyl acrylate 2a to give the alpha-aroyl esters 4 took place in the three-component reaction of 2a, aroyl chlorides 1, and Et2MeSiH in the presence of 1 mol % of [Rh(cod)(PR3)2]OTf (cod = 1,5-cyclooctadiene, OTf = OSO2CF3, R = Ph (3a), OPh (3b)) in CH2Cl2. GC and H-1 NMR investigation revealed that the rhodium-catalyzed hydroaroylation proceeds via two successive transformations, that is, hydrosilylation of 2a to afford silyl enol ether 5a followed by C-C bond formation between 5a and 1a. (C) 2013 Elsevier Ltd. All rights reserved.