Abstract
The stereoselective reduction of a diastereoisomeric mixture of benzo[g]octahydroquinolinium ion was examined in detail. A diastereoselective borohydride reduction in combination with an efficient deacylative enzymatic resolution of its β-aminoester precursor are the key steps for a stereoselective installation of the three chiral centres present in the (3S,4aS,10aR)-eutomer of the medicinal drug quinagolide. The obtained data paves the way for an easy and practical attainment of chiral 3-substituted octahydrobenzo[g]quinolines that are privileged structures in medicinal chemistry.
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