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
Resolution of Racemic Rhododendrol by Lipase-Catalyzed Enantioselective Acetylation
作者:Yoshifumi Yuasa、Shiroshi Shibuya、Yoko Yuasa
DOI:10.1081/scc-120018756
日期:2003.1.5
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.
Part 148 in the Series “Studies on Novel Synthetic Methodologies:” Selective Acetylation of Alcohols, Phenols and Amines and Selective Deprotection of Aromatic Acetates using Silica-Supported Phosphomolybdic Acid
efficient catalyst for the selective acetylation of alcohols, phenols and amines in the absence of any solvent and also for the chemoselective deprotection of aromatic acetates under very mild conditions. This method has been used for the protection of the hydroxy groups as well as for the deprotection of the acetates of several naturally occurring bioactive phenolic compounds. The catalyst can be easily