Catalytic Enantioselective Addition of Organometallic Reagents to <i>N</i>-Formylimines Using Monodentate Phosphoramidite Ligands
作者:Maria Gabriella Pizzuti、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/jo702140f
日期:2008.2.1
The asymmetricsynthesis of protected amines via the copper/phosphoramidite-catalyzed addition of organozinc and organoaluminum reagents to N-acylimines, generated in situ from aromatic and aliphatic α-amidosulfones, is reported. High yields of optically active N-formyl-protected amines and enantioselectivities up to 99% were obtained. Under the reaction conditions, partial oxidation of the phosphoramidite
Paracyclophanes in Action: Asymmetric Catalytic Dialkylzinc Addition to Imines Using [2.2]Paracyclophane-based N,O-Ligands as Catalysts
作者:Stefan Dahmen、Stefan Bräse
DOI:10.1002/ijch.201100078
日期:2012.2
The asymmetricaddition of dibutylzinc to imines is achieved by employing [2.2]paracyclophane‐based ketimine ligands with good to excellent enantioselectivities. A comparison to other organozinc reagent is made.