Synthesis of C2-symmetrical bis-β-amino alcohols and their application in the enantioselective addition of diethylzinc to aldehydes
作者:Qianyong Xu、Hui Wang、Xinfu Pan、Albert S.C Chan、Teng-kuei Yang
DOI:10.1016/s0040-4039(01)01236-9
日期:2001.8
The C-2-symmetrical bis-beta -amino alcohols 1-6 were prepared and especially attention is focused on bridges. which link the two beta -amino alcohol units. These ligands hake been applied as chiral catalysts in the asymmetric addition of diethylzinc to aldehydes. see-Alcohols have been obtained in good yields with up to 95.4%, enantiomeric excess. (C) 2001 Elsevier Science Ltd. All rights reserved.
Enantioselective synthesis of secondary alcohols in the presence of chiral ligands
作者:L. Colombo、C. Gennari、G. Poli、C. Scolastico
DOI:10.1016/0040-4020(82)80029-x
日期:——
The synthesis of two S-proline derivatives is described together with their use as chiral ligands for lithium in reactions of n-butyllithium with benzaldehyde to give 1-phenyl-1-pentanol with moderate opticalpurity. The presence of lithium salts in the reaction mixture causes a decrease in asymmetric induction.