Enantioselective Arylations Catalyzed by Carbohydrate-Based Chiral Amino Alcohols
作者:Ana Dionéia Wouters、Gustavo H. G. Trossini、Hélio A. Stefani、Diogo S. Lüdtke
DOI:10.1002/ejoc.201000113
日期:2010.4
The application of carbohydrate-derived aminoalcohols in the asymmetric arylation of aldehydes by using arylboronic acids as the source of transferable aryl groups is described. The best ligand is derived from the readily available sugar D-xylose and it mediates the addition of a range of arylboronic acids to various aromatic aldehydes in excellent yields and high enantiomeric excesses.
Carbohydrate-derived aminoalcohol ligands for asymmetric Reformatsky reactions
作者:Daniel P.G. Emmerson、William P. Hems、Benjamin G. Davis
DOI:10.1016/j.tetasy.2004.11.049
日期:2005.1
Members of a family of functionally and stereochemically diverse D-glucosamine-derived tertiary aminoalcohol ligands have been used to promote the asymmetric Reformatsky reaction. The beta-hydroxyester product tert-butyl 3-phenyl-3-hydroxy-propanoate was obtained enriched in either the (+)-(R) (up to 74% ee) or (-)-(S) (up to 42% ee) enantiomer depending on the choice of ligand. Although the selectivities are modest in absolute terms they represent some the better selectivities obtained to date for this reaction. A H-1 NMR study was conducted to investigate this selectivity and suggested a secondary binding mode between ligand and zinc in addition to the expected N-2, O-3 coordination. (C) 2004 Elsevier Ltd. All rights reserved.