- Lipase-mediated resolution of substituted 2-aryl-propanols: Application to the enantioselective synthesis of phenolic sesquiterpenes
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A comprehensive study of the lipase-mediated resolution of substituted 2-aryl-propanols is reported. The latter alcohols were submitted to the irreversible acetylation catalyzed either by PPL, CRL, or lipase PS. The enantioselectivity of these transformations was dependent on the type of lipase used. The type of substituents and particularly their position on the aromatic ring strongly affected the selectivity of the reaction. The experiments described prove that PPL is the more versatile lipase catalyzing the acetylation with an enantiomeric ratio (E) value that ranges from 1 up to 144, depending on the substrate used. Conversely, the same transformations were catalyzed by CRL and lipase PS with an enantiomeric ratio value, which is always less than 5. The remarkable behavior of PPL was exploited in the large scale resolution of some substituted 2-aryl-propanols whose enantiomeric forms are relevant building blocks in the enantioselective synthesis of phenolic sesquiterpenes. By these means, the synthesis of (S)-turmeronol B and the formal syntheses of (R)-curcumene, (R)-curcuphenol, (R)-xanthorrhizol, and (R)-curcuhydroquinone were accomplished.
- Serra, Stefano
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p. 619 - 628
(2011/07/08)
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- Enantioselective synthesis of (R)- and (S)-curcumene and curcuphenol: an efficient chemoenzymatic route
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An efficient enantioselective synthesis of curcumene and curcuphenol is described. The key intermediates, substituted butanoates 7a and 7b and their acids 8a and 8b are obtained in high enantiopurity (>99% ee) by a lipase-catalyzed kinetic resolution proc
- Kamal, Ahmed,Malik, M. Shaheer,Shaik, Ahmad Ali,Azeeza, Shaik
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p. 2547 - 2553
(2008/03/15)
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- Novel sparteine-mediated enantio-dichotomic formal synthesis of (R)-(-)- and (S)-(+)-curcuphenol
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High and opposite enantiodiscriminations were observed between tertiary amides and secondary amides in the sparteine-mediated lateral metalation-allylation of 2-ethyl-m-toluamide derivatives (2a, 2e). The results described above have been applied for the formal synthesis of both enantiomers of curcuphenol. The brief mechanistic studies suggested that stereoinformation was introduced after the deprotonation step.
- Kimachi,Takemoto
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p. 2700 - 2704
(2007/10/03)
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