The enantiomerically enriched diastereoisomers of the chiral1,3-dioxaneodorants Floropal® (1) and Magnolan® (2) were prepared by an enzyme-mediated approach. Their olfactory properties were evaluated to investigate differences in the odor perception for the stereoisomers.
Stereoselective addition of organometallic reagents to β-hydroxyketones
作者:José Luis Garcia Ruano、Amelia Tito、Rafael Culebras
DOI:10.1016/0040-4020(95)01048-3
日期:1996.2
Reactions of several β-hydroxyketones with different methylation reagents are reported. The de's are moderated or good (40–75%) and slightly change with the relative steric size of the R groups at the starting hydroxyketone. The syn-diols are predominant in reactions with Me3Al/ZnBr2 and MeLi/Me3Al, whereas the anti-diols are the major ones with MeLi/ZnBr2. The method has been used to synthesize optically