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Enantioselective synthesis of the C1-C11 fragment of bafilomycin A1 using non-wittig and desymmetrization strategies
Abstract : The synthesis of the C1-C11 fragment 33 of bafilomycin A1 was achieved. Intermediate ketone 16 was prepared in six steps from 4-oxopimelate 13. Desymmetrization of this ketone using Koga's chiral base followed by TMSCl quench furnished silyl enol ether 17 with excellent enantioselectivity. Further elaboration led to C5-C11 aldehyde 24, which was coupled with sulfone 3 to give lactone 25 in very good yield. The subsequent reductive elimination created the E-trisubstituted C4-C5 olefin with a 13:1 selectivity. The E C2-C3 double bond was then installed by methanol elimination, and compound 33 was obtained after a few functional group manipulations and a Negishi methyl zirconation.
https://hal-polytechnique.archives-ouvertes.fr/hal-00954829
Contributor : Denis Roura Connect in order to contact the contributor
Submitted on : Friday, March 21, 2014 - 4:52:19 PM
Last modification on : Thursday, December 9, 2021 - 2:26:02 PM
Contributor : Denis Roura Connect in order to contact the contributor
Submitted on : Friday, March 21, 2014 - 4:52:19 PM
Last modification on : Thursday, December 9, 2021 - 2:26:02 PM
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