Sunlight-Driven Decarboxylative Alkynylation of α-Keto Acids with Bromoacetylenes by Hypervalent Iodine Reagent Catalysis: A Facile Approach to Ynones
作者:Hui Tan、Hongji Li、Wangqin Ji、Lei Wang
DOI:10.1002/anie.201503479
日期:2015.7.13
A novel and practical decarboxylativealkynylation of α‐keto acids with bromoacetylenes is catalyzed by hypervalent iodine(III) reagents when irradiation by sunlight at room temperature. The product ynones are generated in good yields. Experiments show that results obtained with blue light (λ=450–455 nm) are comparable to those obtained when using sunlight. Mechanistic studies demonstrate that the
Pd-Catalyzed Carbonylative Reactions of Aryl Iodides and Alkynyl Carboxylic Acids via Decarboxylative Couplings
作者:Ahbyeol Park、Kyungho Park、Yong Kim、Sunwoo Lee
DOI:10.1021/ol102993y
日期:2011.3.4
carboxylic acids reacted with aryliodides under a CO atmosphere in the presence of a palladium catalyst to produce α,β-alkynyl aryl ketones in good yields. The maximum turnover number was 16 800. The desired carbonylativecoupling was formed from phenyl propiolic acid without any formation of a noncarbonylative coupling product in the absence of CuI. However, the reaction with alkyl-substituted alkynyl
Efficient synthesis of ynones from carboxylic acids and terminal alkynes <i>via</i> Pd/Cu catalysis using 2-chloroimidazolium chloride as the activation reagent
作者:Weixiang Zheng、Nengde Liang、Yi Fu、Jing Zhong、Yan Zhang、Li Wang、Yuanhua Wang、Qiwei Wang
DOI:10.1039/d3nj02316h
日期:——
utilizing IPrCl-Cl as the activation reagent to couple carboxylic acids with terminalalkynes. The reaction employs CuI/Pd(PPh3)2Cl2 as the co-catalyst and Et3N as the solvent, resulting in excellent yields (up to 88%) of ynones. The use of carboxylic acids as a starting material makes this method a valuable contribution to organic synthesis.
Supported Pd-catalyzed decarboxylative carbonylation reaction of 2-alkynoic acids and aryl iodides
作者:Poonam Sharma、Pushkar Mehara、Ajay Kumar Sharma、Pralay Das
DOI:10.1039/d3cy01765f
日期:——
acids and aryliodides has been introduced. Herein, Pd nanoparticles (NPs) supported on polystyrene (Pd@PS) have efficiently catalyzed both decarboxylation of alkynoic acids and their subsequent carbonylativecoupling with aryliodides, employing oxalic acid as a CO source. Furthermore, milder reaction conditions, vast substrate scope, high functional group tolerance, catalyst reusability and use of solid