- Biocatalytic racemization of α-hydroxy ketones (acyloins) at physiological conditions using Lactobacillus paracasei DSM 20207
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Biocatalytic racemization of open-chain and cyclic dialkyl-, alkyl-aryl- and diaryl-substituted acyloins was accomplished using whole resting cells of Lactobacillus paracasei DSM 20207. The mild (physiological) reaction conditions ensured the suppression of undesired side reactions, such as elimination or condensation. This novel biocatalytic isomerization protocol represents an essential tool for the deracemization of pharmacologically important building blocks.
- Nestl, Bettina M.,Kroutil, Wolfgang,Faber, Kurt
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- Photolysis of cyclic enol esters in the presence or absence of a single electron transfer photosensitizer
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The photochemistry of enol esters 1 is dominated by electrocyclic ring opening (1b → 3+4), 1,3-acyl migration (1c,d → 6c,d) and [2 + 2] dimerization (1d → 11). Photosensitization with triphenylpyrylium tetrafluoroborate (TPT) enhances formation of oxidation products (1b → 5,1c,d → 9c,d + 10c,d), presumably through the intermediacy of radical cations 1b-d+.
- Climent,Garcia,Iborra,Miranda,Primo
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p. 9289 - 9296
(2007/10/02)
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