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
Bulky diarylammonium arenesulfonates as mild and extremely active dehydrative ester condensation catalysts
作者:Akira Sakakura、Shoko Nakagawa、Kazuaki Ishihara
DOI:10.1016/j.tet.2005.09.059
日期:2006.1
especially large-scale, fundamental reactions like estercondensations, are highly desirable for many reactions. Bulky diarylammonium pentafluorobenzenesulfonates and tosylates serve as extremely active dehydration catalysts for the estercondensation reaction of carboxylicacids with equimolaramounts of sterically demanding alcohols and acid-sensitive alcohols. Typically, the esterification reaction is performed
Bulky Diarylammonium Arenesulfonates as Selective Esterification Catalysts
作者:Kazuaki Ishihara、Shoko Nakagawa、Akira Sakakura
DOI:10.1021/ja050223v
日期:2005.3.1
large-scale, fundamental reactions such as estercondensations, are highly desirable for many reactions. Bulky diarylammonium pentafluorobenzenesulfonates and tosylates serve as extremely active dehydration catalysts for the estercondensation reaction of carboxylicacids with equimolaramounts of sterically demanding alcohols and acid-sensitive alcohols. Typically, the esterification reaction is performed
two-step intermolecular esterification via the condensation of carboxylic acids with nucleophilic hydroxyl species was reported. A broad substrate scope with respect to carboxylic acids, alcohols, and phenols was observed. The α-acyloxyenamide intermediates formed by the addition of carboxylic acids to ynamides proved to be effective acylating reagents for the esterification of alcohol and phenol derivatives
Efficient condensation of carboxylic acids with alcohols catalyzed by fluorous ammonium triflates
作者:László Mercs、Gianluca Pozzi、Silvio Quici
DOI:10.1016/j.tetlet.2007.02.117
日期:2007.4
salts as metal-free catalysts for the directcondensation of equimolaramounts of carboxylicacids and aliphatic alcohols has been investigated. Esterification reactions were thus conveniently carried out under mild fluorous biphasic conditions, in the presence of 1 mol % of fluorous ammonium triflate and without recourse to any additional water removal technique. Good to excellent ester yields were obtained