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Efficient, stereocontrolled total synthesis of the title compound is described, starting from enantiopure intermediates. A key step was the diastereoselective catalytic hydrogenation of a pentacyclic oxazepinohexahydroindolo[2,3-a]quinolizine derivative.
Enantiopure 3,7-diazabicyclo[3.3.1]nonane derivatives 4 and 5, potential precursors of quinolizidine alkaloids, were synthesised in high yields, starting from the biocatalytic asymmetrization of σ-symmetric 3,5-disubstituted piperidines. Their application to the total synthesis of the new pharmacologically active compounds 3 are also described.
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