Enantioselective diethylzinc addition to aldehydes via chiral, non-racemic β-hydroxysalicylhydrazone catalysts
作者:Raleigh W. Parrott、Delvis D. Dore、Seshanand P. Chandrashekar、Jeromy T. Bentley、Brittany S. Morgan、Shawn R. Hitchcock
DOI:10.1016/j.tetasy.2008.02.007
日期:2008.3
A series of tridentate beta-hydroxysalicylhydrazone ligands have been prepared from (1R,2S)-ephedrine and (1R,2S)-norephedrine and tested in the catalytic asymmetric addition of dietbylzine to aldehydes. The isolated chemical yields of the addition products ranged from 50% to 84%. The reactions exhibited very good enantioselectivity with enantiomeric ratios ranging from 89:11 to 96:4. (C) 2008 Elsevier Ltd. All rights reserved.