缩合 d'enolates(例如 l'enolate de Li de la dimethyl-2,6 cyclohexene-2one) avec le trichloroethylene, d'autres ethylenes polyhalogenes et le perchlorobutadiene-1,3。机制。全氯丁烯的内酯化作用。氯乙炔缩合
Exploiting Carbonyl Groups to Control Intermolecular Rhodium-Catalyzed Alkene and Alkyne Hydroacylation
作者:Thomas J. Coxon、Maitane Fernández、James Barwick-Silk、Alasdair I. McKay、Louisa E. Britton、Andrew S. Weller、Michael C. Willis
DOI:10.1021/jacs.7b05713
日期:2017.7.26
Rh-catalyzed intermolecular alkene and alkynehydroacylation reactions. By using cationic rhodium catalysts incorporating bisphosphine ligands, efficient and selective reactions are achieved for β-amido, β-ester, and β-keto aldehyde substrates, providing a range of synthetically useful 1,3-dicarbonyl products in excellent yields. A correspondingly broad selection of alkenes and alkynes can be employed
Efficient Decarboxylative/Defluorinative Alkylation for the Synthesis of
<scp>
<i>gem</i>
‐Difluoroalkenes
</scp>
through an
<scp>
S
<sub>N</sub>
2
</scp>
’‐Type Route
作者:Wei‐Long Xing、Jia‐Xin Wang、Ming‐Chen Fu、Yao Fu
DOI:10.1002/cjoc.202100709
日期:2022.2
An efficientdecarboxylative/defluorinativealkylation for synthesizing gem-difluoroalkenes is described, providing a general method for installation of the challenging alkyl fragments containing α-electron-withdrawing groups into α-trifluoromethyl alkenes. Mechanistic studies suggest that this process involves an SN2′-type synthetic route in the absence of transition-metal catalysts or photocatalysis
描述了一种用于合成偕二氟烯烃的有效脱羧/脱氟烷基化反应,为将含有 α-吸电子基团的具有挑战性的烷基片段安装到 α-三氟甲基烯烃中提供了一种通用方法。机理研究表明,该过程涉及在没有过渡金属催化剂或光催化的情况下的 S N 2' 型合成路线。此外,该协议可以很容易地扩大规模,并成功应用于生物活性分子的修饰,从而补充了获得结构通用的gem-二氟烯烃的方法。
A new synthesis of<i>N</i>-alkyl pyrazolidine-3,5-diones and tetrahydropyridazine-3,6-diones
作者:Bertrand Le Bourdonnec、Emmanuelle Meulon、Saïd Yous、Raymond Houssin、Jean-Pierre Hénichart
DOI:10.1002/jhet.5570370530
日期:2000.9
N-alkyl pyrazolidine-3,5-diones and tetrahydropyridazine-3,6-diones have been synthesized by a new method in a three-step sequence from dialkyl malonates or succinates respectively.
A process for production of lower alkanoic acids. A reaction mixture comprising a substituted malonic acid, an acid catalyst, and a limited amount of water is heated to a temperature sufficient to hydrolyze and decarboxylate the ester. The reaction mixture is maintained at the temperature by periodic addition of limited amounts of water, and the reaction is continued for a period of time sufficient to remove substantially all of the alcohol and carbon dioxide generated by the hydrolysis reaction, thereby converting substantially all of the ester to alkanoic acid. The process is particularly useful for the production of valproic acid.