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.