Enantioselective Base-Free Electrophilic Amination of Benzofuran-2(3H)-ones: Catalysis by Binol-Derived P-Spiro Quaternary Phosphonium Salts
作者:Chuan-Le Zhu、Fa-Guang Zhang、Wei Meng、Jing Nie、Dominique Cahard、Jun-An Ma
DOI:10.1002/anie.201100283
日期:2011.6.20
A spiroing reactivity: A series of novel binol‐derived P‐spiro quaternaryphosphoniumsalts were designed, prepared, and used for the first highly enantioselectiveamination of benzofuranones (see scheme; binol=1,1′‐2‐binaphthol, Bn=benzyl). An unprecedented mechanism involving the π–π interactions between the substrate and the catalyst was proposed as the primary binding mode on the basis of molecular