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DOI: 10.1055/s-2002-34386
Oxabicyclo[3.2.1]oct-6-enes as Templates for the Stereoselective Synthesis of Polypropionates: Total Synthesis of Callystatin A and C19-epi-Callystatin A
Publication History
Publication Date:
26 September 2002 (online)
Abstract
The total synthesis of the polyketide natural product callystatin A and its novel analog C19-epi-callystatin A is described. Our strategy features the use of an enantiomerically pure oxabicyclo[3.2.1]oct-6-ene as a template for the stereocontrolled preparation of the C15-C21 polypropionate region.
Key words
total synthesis - natural products - asymmetric synthesis - ring opening - stereoselectivity
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References
We independently found the same solution to the olefination problem of intermediate 25/B as was reported recently in the literature. [12a] [35]
37Alternatively, diol 27 could also be prepared from intermediate 19 (Scheme [19] ).
44(E)-Enal (Scheme [20] ) was consistently isolated from the MnO2 allylic oxidation in approximately 4% yield. This material could be recycled by stirring in 2-propanol and PPTS, forming 38 in modest yield.
47Ratio determined by comparing isolated yields and tert-butyl signals on the 1H NMR spectra of the mixed fractions of mono-silylated products. An accurate measurement of the ratio could not be based on the crude 1H NMR.