Reaction of carboxylicacids with alcohols by using an equimolar amount of di-2-thienyl carbonate (2-DTC) in the presence of a catalytic amount of 4-(dimethylamino)pyridine (DMAP) followed by addition of an equimolar amount of iodine proceeded smoothly to afford the corresponding esters and 2(5H)-thiophenone in good to high yields.
di-2-thienyl carbonate (2-DTC) in the presence of a catalytic amount of 4-(dimethylamino)pyridine (DMAP) proceeded smoothly to afford the corresponding esters in good-to-high yields along with 2(5H)-thiophenone. This esterification was accelerated by the addition of an equimolar amount of iodine to afford the esters in higher yields within a shorter reaction time. Further, cyclization of ω-hydroxycarboxylic
Esterification of carboxylic acids with alcohols by using di-2-thienyl carbonate in the presence of a catalytic amount of 4-(dimethylamino)pyridine (DMAP) proceeded smoothly under mild conditions t...
Pyridine-3-carboxylic Anhydride (3-PCA): A Versatile, Practical, and Inexpensive Reagent for Condensation Reaction between Carboxylic Acids and Alcohols
作者:Teruaki Mukaiyama、Setsuo Funasaka
DOI:10.1246/cl.2007.326
日期:2007.2
A synthesis of carboxylic esters from various carboxylic acids and alcohols is successfully carried out by using a condensation reagent, pyridine-3-carboxylic anhydride (3-PCA). This reaction materialized synthesis of various carboxylic esters to be carried out under mild conditions by simple experimental procedure.
Pinwheel-like tridentate phosphines for controlling divergent regioselectivity in Pd-catalyzed alkoxycarbonylation of alkenes
作者:Tian-Hong Jing、Yi-Ying Zhuang、Xiao-Xin Zhang、Jian-Guo Qian、Xiao-Li Zhao、Yong Lu、Hai-Jing Wang、Ye Liu
DOI:10.1016/j.jcat.2024.115406
日期:2024.4
The elaborate control of regioselectivity regulated by the involved ligands with specific structural skeleton and compositions is always demanded in alkoxycarbonylation of alkenes. Herein, a series of pinwheel-liketridentatephosphine ligands with rotatable flexibility () or hard rigidity () were synthesized and characterized for the first time, in which the incorporated three PPh-fragments are located