Directed aldol condensations utilising boron enolates (2) and (7) allowed the stereospecific synthesis of the racemic thioester (3) and the chiral ester (4) in high yield; these were converted by standard methodology into the title compounds.
R. Baker and J. A. Devlin, J. Chem. Soc., Chem. Commun., 1983, 147 DOI: 10.1039/C39830000147
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