Imides have not only been used as the starting materials for preparation of N-containing heterocycles,1 but also have been focussed on from the view point of biological activity.2 In gen- eral the preparation of imides involves acylation of amides with anhydrides,3 acyl chlorides,2,4 or ketene,5 and, more recently, with α,α,α-trichloromethyl carbonyl compounds6 and enol esters;7 however, these methods involve some problems, such as low yield or ...
