Palladium-catalyzed asymmetric allylic alkylation of 1,3-diplienyl-2-propenyl acetate with the dimethyl malonate-BSA-LiOAc system has been successfully carried out in the presence of easily prepared new chiral amino-phosphinite ligands such as 3b and 3c to result in good yields and excellent enantioselectivities of up to 95%, e.e. (C) 2002 Published by Elsevier Science Ltd.
New 1-amino-1,2-diphenylethanols as ligands for the enantioselective addition of alkyllithiums to benzaldehyde
摘要:
In the presence of equimolar amounts of lithium alkoxides derived from N-substituted 2-amino-1,2-diphenylethanols, alkyllithium reagents add to benzaldehyde to furnish optically active secondary alcohols with enantiomeric excesses of up to 86%. The best results were obtained using the N-isopropyl-N-methyl substituted amin-oalcohol. (C) 1999 Elsevier Science Ltd. All rights reserved.
Palladium-catalyzed asymmetric allylic alkylation of 1,3-diplienyl-2-propenyl acetate with the dimethyl malonate-BSA-LiOAc system has been successfully carried out in the presence of easily prepared new chiral amino-phosphinite ligands such as 3b and 3c to result in good yields and excellent enantioselectivities of up to 95%, e.e. (C) 2002 Published by Elsevier Science Ltd.
New 1-amino-1,2-diphenylethanols as ligands for the enantioselective addition of alkyllithiums to benzaldehyde
作者:Michael Schön、Reto Naef
DOI:10.1016/s0957-4166(98)00473-x
日期:1999.1
In the presence of equimolar amounts of lithium alkoxides derived from N-substituted 2-amino-1,2-diphenylethanols, alkyllithium reagents add to benzaldehyde to furnish optically active secondary alcohols with enantiomeric excesses of up to 86%. The best results were obtained using the N-isopropyl-N-methyl substituted amin-oalcohol. (C) 1999 Elsevier Science Ltd. All rights reserved.