Enantiomeric excess analysis of (2R, 3S)-3-deuterio-2-methylcyclohexanone and (1S, 2R, 3S)-3-deuterio-2-methylcyclohexanol, through deuterium NMR in a polypeptide lyotropic liquid crystal
摘要:
Poly-gamma-benzyl-L-glutamate (PBLG) and dichloromethane form a lyotropic liquid crystal which can be used as solvent for enantiomeric excess analysis of molecules containing several stereogenic centers, through deuterium NMR spectroscopy. All isomers of 3-deuterio-2-methylcyclohexanone and of 3-deuterio-2-methylcyclohexanol dissolved in PBLG/CH(2)Cl2 solvents, exhibit different quadrupolar splittings on their deuterium NMR spectra, which allows an accurate determination of their diastereoisomeric and enantiomeric excesses.
Microbiological synthesis of optically active (2R,3S)-2,3-deuteriocyclohexan-1-ones and (2R,3S)-2-methyl-3-deuteriocyclohexan-1-one. Enantiospecificanti-addition of hydrogen to the double bond of cyclohex-2-en-1-ones.
摘要:
Addition of hydrogen to the double bond of cyclohexenones during microbiological reduction by Beauveria sulfurescens gives the trans product in high yield (90%) resulting from anti-addition to the si face on C-2 and the re face on C-3.