A simple method for selective acylation of protected and unprotected hydroxylamines with bis- and tetrakis-substituted p-tert-butylcalix[4]arene-acids through amide bond formation via mixed anhydrides is presented. The first crystal structure of calix-hydroxamate 1 is presented.
提出了一种通过混合酸酐形成酰胺键,对保护和未保护的
羟胺进行选择性酰化的简单方法,采用了双取代和四取代的对叔丁基
钙克[4]芳酸。此外,首次提供了
钙克羟
肼化合物1的晶体结构。