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- W2071715619 abstract "Abstract A series of racemic 10-alkyl-3-formyl-10 H -phenothiazine-5-oxides (±)- 2a – h were subjected to biotransformation with baker's yeast resulting in optically active aldehydes (+)- 2a – h and alcohols (−)- 3a – h in moderate enantiomeric excess. The racemic 10-alkyl-3-hydroxymethyl-10 H -phenothiazine-5-oxides (±)- 3a – h and 3-acetoxymethyl-10-alkyl-10 H -phenothiazine-5-oxides (±)- 4a – h obtained from the racemic aldehydes (±)- 2a – h were also tested in enantioselective lipase-catalyzed acetylations and alcoholysis reactions. The highest enantiomeric purities were achieved by a Novozyme 435-catalyzed acetylation–ethanolysis sequence, leading to optically active alcohols (−)- 3a – h in 83–92% e.e. A novel NMR method using enantiopure dibenzoyl tartaric acid as chiral additive was developed for determination of the enantiomeric composition of the optically active products." @default.
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- W2071715619 date "2002-02-01" @default.
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- W2071715619 title "Synthesis of optically active 3-substituted-10-alkyl-10H-phenothiazine-5-oxides by enantioselective biotransformations" @default.
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- W2071715619 doi "https://doi.org/10.1016/s0957-4166(02)00077-0" @default.
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