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DOI: 10.1055/s-0030-1260036
Enantioselective Route to β-Silyl-δ-keto Esters by Organocatalyzed Regioselective Michael Addition of Methyl Ketones to a (Silylmethylene)malonate and Their Use in Natural Product Synthesis
Publikationsverlauf
Publikationsdatum:
11. Mai 2011 (online)

Abstract
The direct Michael addition of alkyl methyl ketones through the acetyl methyl terminal to diethyl {[dimethyl(phenyl)silyl]methylene}malonate was catalyzed by the (S)-N-(pyrrolidin-2-ylmethyl)pyrrolidine/trifluoroacetic acid combination with high yield and excellent regio- and enantioselectivity. The ketone adducts can easily undergo de-ethoxycarbonylation to give β-silyl-δ-keto esters with excellent synthetic potential. This has been demonstrated by the synthesis of a suitably substituted β-silyl-δ-keto ester as an advanced intermediate for a chiral hydroxylated pyrrolidine natural product, (+)-preussin. Silicon-controlled diastereoselective reduction of the ketone functionality of β-silyl-δ-keto esters followed by lactonization of the resulting hydroxy esters gave disubstituted δ-valerolactones. Advanced intermediates for the antipodes of natural products, namely (+)-massoialactone and (+)-mevinolin analogue, and natural products, namely (-)-tetrahydrolipstatin and (+)-5-hexadecanolide, have been achieved.
Key words
Michael addition - organosilicon compounds - methyl ketone - organocatalysis - regioselective - natural product
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References
The absolute stereochemistry of addition products 14 and 15 was not determined.
47The minor diastereomeric lactone was not isolated during chromatographic purification.