A novel Brønsted-acid-promoted selective C2–N1 ring-expansion reaction of indoles has been developed that provides a rapid and efficient protocol for the preparation of fused quinolines. A variety of corresponding quinolines were obtained in high yields. Controlled experiments revealed that C2-spiroindolenines might be intermediates of this C2–N1 ring-expansion reaction. The notable advantages of this
已经开发了一种新的布朗斯台德酸促进的
吲哚选择性 C2-N1 扩环反应,为稠合
喹啉的制备提供了一种快速有效的方案。以高产率获得了多种相应的
喹啉。对照实验表明,C2-螺二氢
吲哚可能是这种 C2-N1 扩环反应的中间体。该工艺的显着优势包括出色的产率、良好的官能团耐受性和操作简单。