Introduction of sulphenyl or halogen substituents at C-7 of ketone (1), followed by stereospecific reduction steps, provides a selective route either to the (6RS,7RS,9RS) or to the (6RS,7RS,9RS) isomers, (10) and (11), of 7-(1-hydroxyethyl)-8-oxo-1-aza-3-oxabicyclo[4.2.0]octane-2-spirocyclohexane.
J. H. Bateson, A. M. Quinn and R. Southgate, J. Chem. Soc., Chem. Commun., 1986, 1151 DOI: 10.1039/C39860001151
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