Imidazolinium-derived carbenes catalyze the ring-expansion lactonization of oxacycloalkane-2-carboxaldehydes. A variety of functionalized five-, six-, and seven-membered lactones can be formed efficiently under mild reaction conditions. The success of this new method for the construction of lactones is highly influenced by the electronic nature of the carbene catalyst.
咪唑啉鎓衍生的卡宾催化氧杂环烷-2-甲醛的扩环内酯化反应。在温和的反应条件下,可以有效地形成各种功能化的五元,六元和七元内酯。卡宾催化剂的电子性质极大地影响了这种构建内酯的新方法的成功。