Palladium-catalysed atom-economical synthesis of conjugated dienals from terminal acetylenes and acrolein
作者:Zoë Hearne、Chao-Jun Li
DOI:10.1039/c7cc02767b
日期:——
the prevalence of the (E,E)-diene in a wide range of functional molecules. It is shown herein that (E,E)-dienals can be readily prepared in two palladium-catalysed steps from simple, unactivated starting materials; terminalacetylenes and acrolein can be coupled via conjugate addition, followed by alkyne isomerisation. This procedure provides a highly atom-economical, redox-neutral and practical method
acetylenic aldehydes with alcohols in the presence of a catalytic amount of Pd(OAc)2 in 1,4-dioxane at room temperature gave the 5- or 6-membered acetal products in high yields. The 13C NMR studies suggested that a Pd(II) catalyst exhibited dual roles in the present reaction; the attack of ROH to aldehyde is catalyzed by Lewis acidic Pd(OAc)2, and the nucleophilic oxygen of the resulting hemiacetal reacts
Palladium-catalyzed 1,4-addition of terminal alkynes to acrolein
作者:Haining Wang、Zoë Hearne、Thomas Knauber、Maria Dalko、Julien Hitce、Xavier Marat、Magali Moreau、Chao-Jun Li
DOI:10.1016/j.tet.2015.05.087
日期:2015.9
A Pd(OAc)(2)-PMe3 catalyzed 1,4-addition of terminal alkynes to acrolein has been developed with an environmentally conscious methodology on water. The reaction conditions were optimized to favor 1,4-addition over acrolein polymerization. The scope of the reaction was explored as well as its performance in acetone. A wide variety of 4-alkynals were obtained in moderate to good yields, thus showing the versatility of this reaction. (C) 2015 Elsevier Ltd. All rights reserved.
METHOD FOR SYNTHESIZING NOVEL COMPOUNDS DERIVED FROM 3-HYDROXY-CYCLOPENTYL ACETIC ACID
申请人:L'OREAL
公开号:US20180057440A1
公开(公告)日:2018-03-01
The present invention relates to compounds of formula (I):
in which R1 is a hydrogen atom, a phenyl radical, or a straight or branched, saturated or unsaturated hydrocarbon radical having 1 to 8 carbon atoms.
noteworthy that the catalyst is also applicable to the oxidation of unsaturatedalcohols such as geraniol and nerol without any isomerization of an alkenic part. Another characteristic property of this heterogeneous catalyst is that a shape selectivity depending on the structure of alcohols is observed in some cases. The catalyst also has advantages such as ease of handling, easy preparation, and reusability