The present disclosure describes operationally simple methods for the low temperature, catalytic activation of carboxylic acids for organic reactions, in particular for direct amidation reactions with amines. The methods involve the use of orthosubstituted arylboromc acids of the formula (I), wherein the groups R1 to R5 are as defined herein. In preferred embodiments R1 is halogen. The arylboromc acids catalyze nucleophilic 1,2-addition reactions, conjugate 1,4-addition reactions, and cycloaddition reactions, including Diels-Alder reactions involving α,β-unsaturated carboxylic acids.
本公开说明书描述了一种操作简单的低温催化活化
羧酸的方法,特别是用于与胺直接进行酰胺化反应。该方法涉及使用式(I)的邻取代芳基
硼酸,其中基团R1到R5的定义如本文所述。在优选实施方案中,R1为卤素。芳基
硼酸催化亲核1,2-加成反应、共轭1,4-加成反应和环加成反应,包括涉及α,β-不饱和
羧酸的Diels-Alder反应。