Vinyl Carbocations Generated under Basic Conditions and Their Intramolecular C–H Insertion Reactions
作者:Benjamin Wigman、Stasik Popov、Alex L. Bagdasarian、Brian Shao、Tyler R. Benton、Chloé G. Williams、Steven P. Fisher、Vincent Lavallo、K. N. Houk、Hosea M. Nelson
DOI:10.1021/jacs.9b02110
日期:2019.6.12
Here we report the surprising discovery that high-energy vinyl carbocations can be generated under strongly basic conditions, and that they engage in intramolecular sp3 C-H insertion reactions through the catalysis of weakly coordinating anion salts. This approach relies on the unconventional combination of lithium hexamethyldisilazide base and the commercially available catalyst, triphenylmethylium
在这里,我们报告了一个令人惊讶的发现,即高能乙烯基碳阳离子可以在强碱性条件下产生,并且它们通过弱配位阴离子盐的催化参与分子内 sp3 C-H 插入反应。这种方法依赖于六甲基二硅氮化锂碱和市售催化剂四苯甲基铵(五氟苯基)硼酸盐的非常规组合。这些试剂形成一种具有催化活性的锂物质,能够将乙烯基阳离子 C-H 插入反应应用于含杂原子的底物。