Functionalized carbodiimides bearing an ester group either at the α or β position undergo cyclization in the presence of tetrabutylammonium fluoride (TBAF) under mild conditions to give 1,3-oxazolin-5-ones or 3,1-benzoxazin-4-ones in synthetically useful yields.
在
四丁基氟化铵(TBAF)的存在下,δ或δ位上带有酯基的官能化碳二
亚胺在温和的条件下发生环化反应,生成 1,3-
噁唑啉-5-酮或 3,1-苯并噁嗪-4-酮,合成产率高。