meta- or para-position are highly effective catalysts for the amide condensation reaction in less-polar solvents. In this paper, we report that N-alkyl-4-boronopyridinium halides are more effective catalysts than the previous ones in more polar solvents. N-Alkyl-4-boronopyridinium halides are effective not only for amide condensation between equimolar mixtures of carboxylic acids and amines but also
The ubiquitousness of esters and amide functionalities makes their coupling reaction one of the most sought-after organic transformations. Herein, we have described an efficient microwave-assisted synthesis of esters and amides. Soluble triphenylphosphine, in conjugation with molecular iodine, gave the desired products without the requirement for a base/catalyst. In addition, a solid-phase synthetic
Primary Alkylboronic Acids as Highly Active Catalysts for the Dehydrative Amide Condensation of α-Hydroxycarboxylic Acids
作者:Risa Yamashita、Akira Sakakura、Kazuaki Ishihara
DOI:10.1021/ol401537f
日期:2013.7.19
Primaryalkylboronicacids such as methylboronic acid and butylboronic acid are highly active catalysts for the dehydrative amide condensation of α-hydroxycarboxylic acids. The catalytic activities of these primaryalkylboronicacids are much higher than those of the previously reported arylboronic acids. The present method was easily applied to a large-scale synthesis, and 14 g of an amide was obtained
AN EFFICIENT AND CONVENIENT PROCEDURE FOR PREPARATION OF MANDELATES CATALYSED BY TiO<sub>2</sub>/SO<sup>2−</sup> <sub>4</sub> SOLID SUPERACID
作者:Tong-Shou Jin、Yan-Ran Ma、Ying Li、Xu Sun、Tong-Shuang Li
DOI:10.1081/scc-100104424
日期:2001.1
An easy and efficient synthesis of mandelates in excellent yields from mandelic acid with alcohols catalysed by TiO2/SO2− 4 solid superacid.
在 TiO2/SO2−4 固体超强酸催化下,从扁桃酸和醇类以优异的收率简单有效地合成扁桃酸。
Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>xH<sub>2</sub>O In Synthesis : A New and Convenient Catalyst For The Esterification Of Mandelic Acid With Alcohols
作者:Gui-Sheng Zhang、Hui Gong
DOI:10.1080/00397919908086134
日期:1999.5
Treatment of various of alcohols with mandelic acid in the presence of a catalytic amount of Fe-2(SO4)(3). xH(2)O to give the corresponding esters in good yields.