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 efficient, chiralbifunctional phase-transfer catalyst with an intramolecular amino functionality has been designed and successfully applied to highly enantioselective amination of 3-aryloxindoles and 3-arylbenzofuran-2(3H)-ones with bis(adamantyl) azodicarboxylate. Optically active amination products were generally obtained in high yield with high enantioselectivity. The origin of stereoselectivity
P-Spiro phosphonium salts catalyzed asymmetric fluorination of 3-substituted benzofuran-2(3H)-ones
作者:Chuan-Le Zhu、Xiao-Yun Fu、Ai-Jia Wei、Dominique Cahard、Jun-An Ma
DOI:10.1016/j.jfluchem.2013.03.007
日期:2013.6
Asymmetric electrophilic fluorination of 3-substituted benzofuran-2(3H)-ones was realized under liquid–liquid phase-transfer catalysis with 2 mol% of chiral phosphoniumsalts to afford the fluorinated products with up to 96% yield and 56% ee.
的非对称电氟化3-取代的苯并呋喃-2(3 H ^) -酮的混合物在液-液相转移催化实现了与2摩尔%的手性鏻盐,得到氟化产物与高达96%的收率和56%ee的。
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