Resolution of Racemic Rhododendrol by Lipase-Catalyzed Enantioselective Acetylation
摘要:
Both (R)- and (S)-enantiomers of rhododendrot were prepared in high enantiomeric exess by lipase from Pseudomonas cepacia (Amano PS)-catalyzed acetylation of racemic 1 with vinyl acetate at room temperature. Especially, in the case of using acetonitrile as the solvent, by-products 4 and 5 were minimized.
Enzymatic Production of Both Enantiomers of Rhododendrol
作者:Musa M. Musa
DOI:10.14233/ajchem.2014.16581
日期:——
An asymmetric synthetic approach to produce (R)- and (S)-rhododendrol is described. W110A Thermoanaerobacter ethanolicus secondary alcohol dehydrogenase (W110A TeSADH), an (S)-specific mutant of TeSADH, is used in this approach. The enantioselective reduction of 4-(4-hydroxyphenyl)-2-butanone catalyzed by W110A TeSADH yielded (S)-rhododendrol, the Prelog product. The anti-Prelog product, (R)-rhododendrol, is produced from (rac)-rhododendrol through enantiospecific kinetic resolution catalyzed by W110A TeSADH.
readily available from ginger, can be easily transformed into chiral derivatives. Zingerol 2, a reduced product of zingerone 1 is expected to be an important new medicinal lead compound. We have achieved a concisesynthesis of optically active zingerol (R)-2 and (S)-2 by the lipase-catalyzed stereoselective transesterification of racemic 2. Under the optimized conditions, a lipase from Alcaligenes sp