Water-soluble cobalt(III) porphyrin complexes were found to promote the hydration of terminal alkynes to give methyl ketones. The alkynehydration proceeded in good to excellent yield with 0.1 to 2 mol % cobaltcatalyst 1 and was compatible with the presence of acid/base- or redox-sensitive functional groups such as alkyl silyl ethers; allyl ethers; trityl ethers; benzyl ethers; carboxylic esters;
Supported Gold Nanoparticle-Catalyzed Hydration of Alkynes under Basic Conditions
作者:Shengzong Liang、Jacek Jasinski、Gerald B. Hammond、Bo Xu
DOI:10.1021/ol5033859
日期:2015.1.2
TiO2-supported nanosize gold particles catalyze the hydration of alkynes using morpholine as a basic cocatalyst. Unlike most homogeneous cationic gold catalysts, the TiO2-Au/morpholine system is weakly basic and is compatible with acid-sensitive functional groups (e.g., silyl ethers, ketals) or with a strongly coordinating group such as pyridine. Whats more, this gold catalyst can be recycled by simple filtration and works well in flow reactors.
Cobaloxime-catalyzed hydration of terminal alkynes without acidic promoters
作者:Shengtai Hou、Hongjian Yang、Bin Cheng、Hongbin Zhai、Yun Li
DOI:10.1039/c7cc03919k
日期:——
Cobaloxime (Co(dmgBF2)2·2H2O), an inexpensive first-row transition-metal complex, catalyzedhydration of terminalalkynes gave the corresponding methyl ketones in good to excellent yields under neutral conditions (additional protic acids and silver salts are not required). A wide range of functional groups, such as allyl ether, benzyl ethers, carboxylic esters, imides, amides, nitro, and halogens,