Synthesis of 2-Alkynoates by Palladium(II)-Catalyzed Oxidative Carbonylation of Terminal Alkynes and Alcohols
作者:Qun Cao、N. Louise Hughes、Mark J. Muldoon
DOI:10.1002/chem.201602558
日期:2016.8.16
PdII catalyst, utilizing a simple and inexpensive amine ligand (TMEDA), allows 2‐alkynoates to be prepared in high yields by an oxidativecarbonylation of terminal alkynes and alcohols. The catalyst system overcomes many of the limitations of previous palladiumcarbonylation catalysts. It has an increased substrate scope, avoids large excesses of alcohol substrate and uses a desirable solvent. The catalyst
The carboxylative coupling of aryl/alkyl terminalalkynes, CO2 and benzyl halides was investigated using silver iodide as the catalyst and Cs2CO3 as the base in CH3CN under ligand-free conditions. This reaction protocol shows a wide substrate scope and high functional group tolerance ability for benzyl halides, in which various functionalized benzyl 2-alkynoates were achieved in good yields. This one-pot
芳基/烷基末端炔烃,CO的carboxylative耦合2使用碘化银作为催化剂和Cs和苄基卤化物进行了研究2 CO 3在CH基座3无配体的条件下,CN。该反应方案显示出宽的底物范围和对苄基卤的高官能团耐受能力,其中以良好的产率获得了各种官能化的2-炔基苄基酯。这种一锅,无配体和CH 3 CN介导的反应被证明易于处理,并且在大气CO 2压力下可以促进。
Ligand-free Ag(I)-catalyzed carboxylative coupling of terminal alkynes, chloride compounds, and CO2
作者:Xiao Zhang、Wen-Zhen Zhang、Ling-Long Shi、Chuang Zhu、Jiao-Lai Jiang、Xiao-Bing Lu
DOI:10.1016/j.tet.2012.08.053
日期:2012.11
Simple silver(I) slats were found to be highly efficient and selective catalyst for carboxylative coupling of aryl- or alkyl-substituted terminal alkynes, CO2, and various allylic, propargylic or benzylic chlorides to exclusively yield functionalized 2-alkynoates. The activity is about 300 times that of the previously reported N-heterocyclic carbene copper(I) catalytic system. The ligand-free silver(I) catalytic system showed the wide generality of substrates involving both functionalized terminal alkynes and chloride compounds. (C) 2012 Elsevier Ltd. All rights reserved.