Synthesis and Enantioselective Baeyer-Villiger Oxidation of Prochiral Perhydro-pyranones with Recombinant<b>
<i>E. coli</i>
</b>Producing<b>
<i>Cyclohexanone Monooxygenase</i>
</b>
作者:Marko D. Mihovilovic、Florian Rudroff、Wolfgang Kandioller、Birgit Grötzl、Peter Stanetty、Helmut Spreitzer
DOI:10.1055/s-2003-42035
日期:——
Recombinant whole cells of Escherichia coli overex-pressing Acinetobacter sp. NCIMB 9871 cyclohexanonemonooxygenase (E.C. 1.14.13.22) have been utilized for the Baeyer-Villiger oxidation of prochiral perhydro-pyranones. The spatial limitations of the enzyme's active site have been estimated by increasing the chain length of cis-substituents in positions 2 and 6. A diastereoselective synthetic sequence
Diastereoselective Synthesis of cis-2,6-Disubstituted Perhydro-4-pyranones Using Elevated Pressure Hydrogenation
作者:Marko D. Mihovilovic、Helmut Spreitzer
DOI:10.1007/s00706-005-0317-8
日期:2005.7
A diastereoselective strategy for the synthesis of gamma-pyrons was developed, starting from the Mg diacetonedicarboxylate complex. Initial cyclization with suitable anhydrides or acid chlorides, followed by hydrolytic decarboxylation leads to 2,6-disubstituted pyrans. Elevated pressure hydrogenation using Pd/C affords the title compounds in high diastereoselectivity. Scope and limitations of the method are outlined on selected examples.
Yamato, Masatoshi; Kusunoki, Youichiro, Chemical and pharmaceutical bulletin, 1981, vol. 29, # 5, p. 1214 - 1220