Sulfur-containing β-amino alcohols as catalysts in enantioselective synthesis
摘要:
Oxazaborolidine catalysts generated in situ from cyclic or acyclic sulfur containing (R)-cysteine, (S)-penicillamine and (S)-methionine derivates and BH3 have been applied successfully to the enantiocontrolled, catalytic reduction of aromatic ketones. The corresponding sec alcohols could be obtained in excellent enantiomeric excess, up to 100% ee. Using these chiral auxiliaries in the enantioselective addition of diethylzinc to aldehydes afforded optically active sec alcohols in enantiomeric excess up to 93% ee. (C) 1997 Elsevier Science Ltd.
New thioether derivatives as catalysts for the enantioselective addition of diethylzinc to benzaldehyde
作者:Thomas Mehler、Jürgen Martens
DOI:10.1016/s0957-4166(00)86174-1
日期:1994.1
Different sulfur-containing beta-amino alcohols have been synthesized and tested in the catalytic enantioselective addition of diethylzinc to benzaldehyde as chiral auxiliaries. The resulting 1-phenyl-1-propanol was obtained in good chemical yield and high optical purity up to 94% op under mild reaction conditions.
Verfahren zur stereoselektiven Reduktion von 17-Oxo-Steroiden