AN ENANTIOCONVERGENT ROUTE TO CARBOCYCLIC NUCLEOSIDES (-)-ARISTEROMYCIN AND (-)-NEPLANOCIN A VIA THE ASYMMETRIC DIELS-ALDER REACTION
The asymmetric Diels-Alder reaction of (SS)-menthyl-3-(2-pyridylsulphinyl)acrylate (4) with cyclopentadiene gave almost a pure single diastereoisomeric cycloadduct.The cycloadduct was then converted into the central intermediate (+)-(3) which w
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