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The title alkaloids, (−)-1, (−)-2, (−)-4 and (+)-5 respectively, have each been prepared from the enantiomerically enriched (74% ee) tetrahydroindolizine 14 which is itself obtained via an organocatalyzed and enantioselective intramolecular Michael addition reaction of the pyrrole 13 incorporating an N-tethered and β,β-disubstituted acrylaldehyde moiety.

Enantioselective total syntheses of the alkaloids (-)-rhazinal, (-)-rhazinilam, (-)-leuconolam and (+)-epi-leuconolam