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
Organocatalytic Asymmetric Branching Sequence of MBH Carbonates: Access to Chiral Benzofuran-2(3<i>H</i>)-one Derivatives with Three Stereocenters
作者:Chuanle Zhu、Lijun Yang、Jing Nie、Yan Zheng、Junan Ma
DOI:10.1002/cjoc.201200809
日期:2012.11
An organocatalyticasymmetricbranchingsequence was realized in the presence of 10 mol% of (DHQD)2AQN, affording the sequential products with three stereocentres, including two quaternary carbon centres, in 47%–79% yields with 85%–99% ee.
An organocatalytic asymmetric reaction of benzofuran-2(3H)-ones with naphthoquinones is disclosed. The current method provides a direct way to furnish arylation of benzofuran-2(3H)-ones in high yields with excellent enantioselectivities. A cooperative...
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