Esterification of Carboxylic Acids and Etherification of Phenols with Amide Acetals
作者:Helmut Vorbrüggen
DOI:10.1055/s-2008-1077882
日期:——
The esterification and etherification of unhindered, as well as severely hindered, carboxylic acids and phenols with basic amide acetals, such as N, N-dimethylformamide dimethyl acetal, and their side reactions are discussed. Modified procedures are described in which these side reactions are avoided to achieve high or near quantitative yields of the desired corresponding methyl esters or phenol methyl
讨论了无受阻和严重受阻的羧酸和酚与碱性酰胺缩醛(如 N,N-二甲基甲酰胺二甲基缩醛)的酯化和醚化,以及它们的副反应。描述了改进的程序,其中避免了这些副反应以获得所需的相应甲基酯或苯酚甲基醚的高或接近定量的产率。在加入 N, N-二甲基甲酰胺二甲基缩醛后,4-硝基苯甲酸在碱性溶剂(如四氢呋喃或 1,4-二恶烷)中的溶液会形成相应的羧酸亚胺盐沉淀,从而得到接近定量的所需产物4-硝基苯甲酸甲酯,以及 N, N-二甲基甲酰胺和甲醇。