作者:Zhongda Pan、Sarah M. Pound、Naveen R. Rondla、Christopher J. Douglas
DOI:10.1002/anie.201310983
日期:2014.5.12
A metal‐free, Lewis acid promoted intramolecular aminocyanation of alkenes was developed. B(C6F5)3 activates N‐sulfonyl cyanamides, thus leading to a formal cleavage of the NCN bonds in conjunction with vicinal addition of sulfonamide and nitrile groups across an alkene. This method enables atom‐economical access to indolines and tetrahydroquinolines in excellent yields, and provides a complementary
开发了一种无金属的路易斯酸促进烯烃的分子内氨基氰化。B(C 6 F 5 ) 3激活N-磺酰氰胺,从而导致N- CN键正式断裂,同时在烯烃上邻接添加磺酰胺和腈基。该方法能够以原子经济的方式以优异的产率获得二氢吲哚和四氢喹啉,并为磺酰胺和腈基团的区域选择性烯烃双官能化提供补充策略。由于双交叉实验中缺乏标签扰乱,13 C标记实验表明完全分子内环化模式。实现了路易斯酸催化,反应可以在空气下进行。