New C 2 -symmetric 2,4-bis(1-hydroxycyclopentyl)azetidines derived from ( S )-1-phenylethylamine and their application in the enantioselective catalysis
作者:Jörg Wilken、Silke Erny、Suzanne Wassmann、Jürgen Martens
DOI:10.1016/s0957-4166(00)00155-5
日期:2000.6
The synthesis of new tridental 2,4-bis(1-hydroxycyclopentyl)azetidines using (S)-1-phenylethylamine as starting material is described. These new structures have been successfully applied in the enantiocontrolled catalytic addition of diethylzinc to aromatic aldehydes reaching enantiomeric excesses of up to 85% for the resulting 1-arylpropan-1-ols. Attempts in the field of the enantioselective oxazaborolidine-catalyzed reduction of ketones employing azetidine alcohols as precatalysts are also included. (C) 2000 Elsevier Science Ltd. All rights reserved.