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
Chiral Calcium Phosphate Catalyzed Enantioselective Amination of 3-Aryl-2-benzofuranones
作者:Ruihan Liu、Suvratha Krishnamurthy、Zhenwei Wu、K. S. Satyanarayana Tummalapalli、Jon C. Antilla
DOI:10.1021/acs.orglett.0c03059
日期:2020.10.16
4-tert-butyl-phenyl substituted (R)-[H8]-BINOL chiral calcium phosphate catalyzedenantioselectiveamination of 3-aryl-2-benzofuranones with dibenzyl azodicarboxylate is described. The catalyst loading of the reaction is 1 mol %. This transformation is facile and has a high degree atom economy, which gave products with good yields and high enantioselectivities (79% to 99%). This reaction has excellent ee