Synthesis and Application of Diphenyl Sulfide Linked Bis(imidazoline) Ligands: Dramatic Electronic Effect of Ligands on Catalytic Behavior
作者:Xian Du、Han Liu、Da-Ming Du
DOI:10.1002/ejoc.201001347
日期:2011.2
Diphenyl sulfide linked bis(imidazoline) ligands with electron-withdrawing N-Ts substitution and electron-donating N-alkyl or N-H substitutions were synthesized through different routes. The electronic effects of the ligands were tuned rationally, and dramatic variation in their catalytic behavior was observed. N-Alkyl and N-H ligands demonstrated much higher catalytic activity and improved enantioselectivity
Development of Diphenylamine-Linked Bis(imidazoline) Ligands and Their Application in Asymmetric Friedel-Crafts Alkylation of Indole Derivatives with Nitroalkenes
作者:Han Liu、Da-Ming Du
DOI:10.1002/adsc.201000111
日期:——
diphenylamine‐linked bis(imidazoline) ligands were prepared through Kelly‐You’s imidazoline formation procedure mediated by Hendrickson’s reagent in good yields. The novel ligands were tested in the asymmetricFriedel–Craftsalkylation of indolederivatives with nitroalkenes. In most cases, good yields (up to 97%) and excellent enantioselectivities (up to 98%) can be achieved. The optimized bis(imidazoline) ligand
New Binaphthyl-Proline-Based Chiral Ligands Bearing Imidazoline Groups: Design, Synthesis, and Their Application in Enantioselective Conjugate Addition of 4-Hydroxycoumarin and Related Nucleophiles to β,γ-Unsaturated α-Ketoesters
作者:Shibo Yu、Qihang Cai、Tianxu Yu、Jiahui Li、Chao Yao、Yue-Ming Li
DOI:10.1021/acs.joc.3c01262
日期:2023.11.3
This paper describes the design and application of new binaphthyl-proline-based chiral ligands bearing imidazoline functional groups. These chiral ligands incorporate the advantages of both the binaphthyl and proline skeletons, they are featured with regulatable electronic and steric properties for the imidazoline functional groups, and form chiral complexes with different metal salts such as cuprous