cascade reaction of 2,3-diketoesters, aromatic amines, and 1,3-cyclohexanediones has been developed for the highly enantioselectivesynthesis of axially chiral N-arylindoles. The success of this method derivesfrom the use of a newly developed second-generation chiral spirocyclic phosphoric acid as the catalyst. In addition, this protocol was extended to the synthesis of an axially chiral monophosphorus
Development of <i>C</i><sub>2</sub>-Symmetric Chiral Spirocyclic Phase-Transfer Catalysts: Synthesis and Application to Asymmetric Alkylation of Glycinate Schiff Base
作者:Changming Xu、Yinsheng Qi、Xinshuang Yang、Xiangfan Li、Zhenpeng Li、Lei Bai
DOI:10.1021/acs.orglett.1c00535
日期:2021.4.16
A class of C2-symmetric chiral spirocyclic phase-transfercatalysts based on tetramethyl-1,1′-spirobiindane scaffold was synthesized from commercially available bisphenol A in 12 steps with 22–25% total yields, which features a more rigid and stable backbone and smaller dihedral angles and can be easily modified. These catalysts show high catalytic performance in the asymmetric alkylation of tert-butyl
Chiral 3,3,3′,3′-Tetramethyl-1,1′-Spirobiindanyl Cyclopentadienyl (TMSCp) Ligands: Design, Synthesis, and Applications
作者:Weicong Guo、Xingying Pang、Jijun Jiang、Jun Wang
DOI:10.1021/acs.orglett.3c00941
日期:2023.6.2
Chiralcyclopentadienyl (Cp) rhodium(III) are powerful catalysts for achieving asymmetric C–H activation. This paper describes the design and synthesis of a new type of chiral Cp ligand bearing a chiral3,3,3′,3′-tetramethyl-1,1′-spirobiindanyl backbone. It features convenient synthesis, easy modification, and relatively low cost. Moreover, it holds great potential in achieving asymmetric C–H activation