Efficient direct ester condensation between equimolar amounts of carboxylic acids and alcohols catalyzed by trifluoromethanesulfonic acid (TfOH) in Solkane365mfc
been devised on the basis of TfOH as the catalyst and Solkane365mfc as the reaction medium. The direct condensation of equimolar amounts of various carboxylic acids and alcohols was conveniently carried out without recourse to any additional water removal technique, giving the desired carboxylic esters in excellent yields.
by using a simple 2,2′-biphenol-derived phosphoric acid catalyst (2.5–10 mol%). This reaction was also successfully conducted at the gram scale. To demonstrate the synthetic utility of this catalytic system, pharmaceutically useful substrates and acid-sensitivesubstrates were examined using these acid–base cooperative phosphoric acid catalysts, which exhibit relatively weak Brønsted acidity.
通过使用简单的 2,2'-联苯酚衍生的磷酸催化剂(2.5–10 mol%),在 100 °C 下促进了羧酸和伯醇或仲醇的等摩尔混合物在甲苯中的脱水酯化反应,无需除去水。 )。该反应也在克级上成功进行。为了证明该催化系统的合成效用,使用这些酸碱协同磷酸催化剂对药学上有用的底物和酸敏感底物进行了检查,这些催化剂表现出相对较弱的布朗斯台德酸性。