Potassium 2,2,5,7,8-Pentamethylchroman-6-oxide: A Rationally Designed Base for Pd-Catalysed Amination
作者:Ka Hou Hoi、Michael G. Organ
DOI:10.1002/chem.201103284
日期:2012.1.16
This base is just right! A new base, potassium 2,2,5,7,8‐pentamethylchroman‐6‐oxide, for Pd‐catalysed amination has been rationally designed that has sufficient basicity to efficiently deprotonate the intermediate aryl palladium ammonium complex, leading to far better rates than obtained with carbonate, which is known to be very mild. At the same time, this new base possesses minimal nucleophilicity
这个基础是正确的!合理设计了一种新的碱,用于Pd催化胺化的2,2,5,7,8-五甲基六价铬酸6-氧化钾,该碱具有足够的碱度,可以有效地使中间的芳基钯铵络合物去质子化,从而获得比由碳酸盐制得,已知碳酸盐非常温和。同时,这种新碱具有最小的亲核性,可以减轻起始原料和产物中对碱敏感的官能团的降解,例如叔丁醇钾或叔丁醇钠常见的情况。