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DOI: 10.1055/s-0028-1088008
Short and Practical Syntheses of (S)-(+)-3-(p-Tolylsulfinyl)furan-2(5H)-one and (S)-(+)-3-(p-Tolylsulfinyl)-5,6-dihydropyran-2-one
Publikationsverlauf
Publikationsdatum:
06. März 2009 (online)
Abstract
(S)-(+)-3-(p-Tolylsulfinyl)furan-2(5H)-one and (S)-(+)-3-(p-tolylsulfinyl)-5,6-dihydropyran-2-one can be synthesized by a new and significantly improved method consisting of Knoevenagel condensation of benzyl (R)-(+)-(p-tolylsulfinyl)acetate with the tert-butyldimethylsilyl derivatives of 2-hydroxyacetaldehyde or 3-hydroxypropanal, followed by subsequent reactions of the resulting mixtures with hydrogen in the presence of palladium-on-carbon and ethereal hydrogen chloride.
Key words
asymmetric synthesis - chiral auxiliaries - sulfoxides - α,β-unsaturated lactones - butenolides
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References
One of the starting products is not commercially available and needs to be prepared by ozonolysis of suitable precursors.
17The synthesis of (±)-1b (three steps and 25% overall yield) has also been reported; see ref. 8b.
195-Hydroxyfuran-2(5H)-one was the only product we could identify when the crude reaction mixture containing 1a was purified by column chromatography.
20Starting from menthyl p-toluenesulfinate (commercially available in the two possible configurations at sulfur), compounds 1a and 1b are obtained in 41% (30% on 5 mmol scale) and 26% (24% on 8 mmol scale) overall yield, respectively.
21The ee of (+)-1b was determined from the well-separated p-tolyl signals in the ¹H NMR spectrum by use of tris[3-(hep-tafluoropropylhydroxymethylene)-(+)-camphorato]ytter-bium(III) as chiral shift reagent.