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DOI: 10.1055/s-2007-965893
Enantioselective Total Synthesis of (+)-Scyphostatin, a Potent and Specific Inhibitor of Neutral Sphingomyelinase
Publikationsverlauf
Received
4 August 2006
Publikationsdatum:
18. Januar 2007 (online)


Abstract
The total synthesis of (+)-scyphostatin, a specific and potent neutral sphingomyelinase inhibitor from a microorganism, was accomplished for the first time starting from d-arabinose and both enantiomers of methyl 3-hydroxy-2-methylpropionate. The method involves (a) stereoselective aldol coupling of a methyl 1,3-dioxolane-4-carboxylate with the Garner aldehyde to establish the asymmetric quaternary carbon center at C4, (b) ring-closing metathesis of the resultant diene to construct the cyclohexene ring, (c) Negishi coupling of a vinyl iodide and an alkyl iodide to form the requisite trisubstituted E-alkene, (d) formation of an amide from the cyclohexene segment and the trisubstituted E-alkene fatty acid segment, and (e) stereospecific formation of an epoxide ring from the mesylate of the amide formed from the two segments.
Key words
scyphostatin - sphingomyelinase - inhibitors - total synthesis - aldol reaction - Negishi coupling