Phosphinoferrocenylaminophosphines as Novel and Practical Ligands for Asymmetric Catalysis
作者:Neil W. Boaz、Sheryl D. Debenham、Elaine B. Mackenzie、Shannon E. Large
DOI:10.1021/ol0261736
日期:2002.7.1
series of ligands with a novel phosphine-aminophosphine ligation design as depicted in structure 1 has been prepared on a ferrocenylethyl backbone. These BoPhoz ligands of structure 2 have afforded exceedingly high activity and enantioselectivity in the rhodium-catalyzed asymmetric hydrogenation of dehydro-alpha-amino acid derivatives, itaconic acids, and alpha-ketoesters. These air-stable ligands are readily
Palladium-Catalyzed Asymmetric Hydroesterification of α-Aryl Acrylic Acids to Chiral Substituted Succinates
作者:Xiaolei Ji、Chaoren Shen、Xinxin Tian、Kaiwu Dong
DOI:10.1021/acs.orglett.1c03361
日期:2021.11.5
A palladium-catalyzed asymmetric hydroesterification of α-aryl acrylic acids with CO and alcohol was developed, preparing a variety of chiral α-substituted succinates in moderate yields with high ee values. The kinetic profile of the reaction progress revealed that the alkene substrate first underwent the hydroesterification followed by esterification with alcohol. The origin of the enantioselectivity
开发了钯催化的 α-芳基丙烯酸与 CO 和醇的不对称加氢酯化反应,以中等收率和高ee值制备了多种手性 α-取代琥珀酸酯。反应过程的动力学曲线表明,烯烃底物首先进行加氢酯化,然后与醇进行酯化。通过密度泛函理论计算阐明了对映选择性的起源。
Preparation of (R)-(−)- and (S)-(+)-3-hydroxymethyl-1-tetralone tosylates, key intermediates in the synthesis of new CNS drugs, via resolution of precursors
作者:Yolanda Caro、Christian F. Masaguer、Enrique Raviña
DOI:10.1016/s0957-4166(02)00822-4
日期:2003.2
The preparation of (R)-(−)- and (S)-(+)-3-hydroxymethyl-1-tetralone tosylates, key intermediates in the synthesis of new CNS drugs in the aminobutyrophenone family, has been developed via classical resolutions or lipase-catalyzed kinetic resolution of one of their precursors.
Asymmetric hydrogenation of various 3-substituted maleic anhydrides catalyzed by Rh/bisphosphine-thiourea (ZhaoPhos) under mild conditions was successfully developed. A wide range of 3-alkyl and 3-aryl maleic anhydrides was hydrogenated well to...