Enrichment, Characterization and Absolute Configuration of the Enantiomers of 1-(3,5-Dimethoxyphenyl)-2-(4-methoxyphenyl)ethanol.
摘要:
The racemate and enriched enantiomers of 1-(3,5-dimethoxyphenyl)-2-(4-methoxyphenyl) ethanol have been obtained via reduction of the respective ketone with LiAlH4 and with BH3 in the presence of oxazaborolidines. Enriched enantiomers were characterized by H-1 NMR spectroscopy, together with the Eu-d-(hfbc)(3) reagent, and by polarimetry. The absolute configuration was obtained by H-1 and C-13 NMR spectroscopy from the (S)-MTPA esters. The configuration of the esters was optimized by force-field calculation.