Ligand-Controlled Regiodivergent Ni-Catalyzed Reductive Carboxylation of Allyl Esters with CO2
摘要:
A novel Ni-catalyzed regiodivergent reductive carboxylation of allyl esters with CO2 has been developed. This mild, user-friendly, and operationally simple method is characterized by an exquisite selectivity profile that is dictated by the ligand backbone.
Conjugateddienes underwent Ni-catalyst-promoted 1,2-hydrocarboxylation in a 1:1ratio with carbon dioxide under atmospheric pressure in the presence of diisobutylaluminum hydride (DIBAL-H) to give the corresponding β,γ-unsaturated carboxylic acids, without dimerization or oligomerization of the conjugateddiene.
Hydrocarboxylation of Allenes with CO<sub>2</sub> Catalyzed by Silyl Pincer-Type Palladium Complex
作者:Jun Takaya、Nobuharu Iwasawa
DOI:10.1021/ja806677w
日期:2008.11.19
complex-catalyzed hydrocarboxylation of allenes under carbon dioxide to give synthetically useful beta,gamma-unsaturated carboxylic acids was developed. This novel CO2-fixation reaction is thought to proceed through the catalytic generation of sigma-allyl palladium species via hydropalladation of allenes, followed by its regioselective nucleophilic addition to CO2 in the presence of an appropriate
开发了三齿 PSiP 钳形钯配合物在二氧化碳下催化丙二烯加氢羧化,得到合成有用的 β, γ-不饱和羧酸。这种新型的 CO2 固定反应被认为是通过丙二烯的氢化钯催化生成 σ-烯丙基钯物种,然后在适当的还原剂存在下将其区域选择性亲核加成到 中进行的。该反应成功应用于带有酯、氨基甲酸酯、酮和烯烃等官能团的各种丙二烯,显示出该方案的高合成效用。
Switchable Site-Selective Catalytic Carboxylation of Allylic Alcohols with CO<sub>2</sub>
作者:Manuel van Gemmeren、Marino Börjesson、Andreu Tortajada、Shang-Zheng Sun、Keisho Okura、Ruben Martin
DOI:10.1002/anie.201702857
日期:2017.6.1
allylic alcohols has been developed in which CO2 is used with dual roles, both facilitating C-OH cleavage and as a C1 source. This protocol is characterized by its mild reaction conditions, absence of stoichiometric amounts of organometallicreagents, broad scope, and exquisite regiodivergency which can be modulated by the type of ligand employed.
Telescoped Synthesis of γ-Bromo-β-Lactones from Allylic Bromides Employing Carbon Dioxide
作者:Sreekumar Vellalath、Daniel Romo
DOI:10.1002/ijch.201600125
日期:2017.4
A direct synthesis of the title compounds involving a stepwise Zn‐mediated carboxylation of allylic bromides with CO2 delivering β, γ‐unsaturated carboxylic acids and a subsequent bromolactonization is reported. The described method demonstrates the use of readily prepared allylzinc bromides by the method of Knochel for fixation of CO2 employing commodity chemicals and zinc dust. This process was then
Procédé pour la préparation d'acides carboxyliques et de leurs sels alcalins
申请人:FIRMENICH SA
公开号:EP0222145A1
公开(公告)日:1987-05-20
Le procédé est caractérisé par le traitement d'un alcoolate de formule
dans laquelle Me représente un atome de métal alcalin, avec du CO à pression élevée, le cas échéant, en présence d'un ligand de cations.
Les acides carboxyliques obtenus ou leurs sels alcalins peuvent trouver une utilisation en tant qu'intermédiaires de synthèse notamment pour la préparation d'esters utiles dans le domaine de la parfumerie et des arômes.
该工艺的特点是在高压下用 CO 处理式如下的烷氧化物
式中 Me 代表碱金属原子的烷氧化物在高压下用 CO 处理,可选择在有阳离子配位体存在的情况下进行。
得到的羧酸或其碱金属盐可用作合成中间体,特别是用于制备香水和香精工业中的酯类。