Requ le 2 mars 1972Des modes de preparation simples et efficaces de paires d'kpimires endo et exo en serie bicyclo[3.3.l]nonanol-2 one-9 sont decrits. La configuration de chacun des isomtres est etablie par voie spectroscopique et par correlation chimique. I1 est montre que le groupe trichloro-2,2,2 ethoxycarbonyle peut Etre employe pour proteger ces aldols et que leur regeneration n'entraine aucune epimerisation.Simple and efficient preparations of some endo and exo epimeric pairs in the bicycio[3.3.l]nonan-2-ol-9-one series are described. The configuration of each isomer is established spectroscopically and by chemical correlation. It is shown that the 2,2,2-trichloroethoxycarbonyl group may be used to protect these aldols and that regeneration of the latter does not give rise to epimerization.
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