Abstract
Condensation of the β-amino alcohol 7 derived from an enantiopure β-amino ester with the β-keto ester 8 provides the vinylogous urethane 9, which is cyclized to give the dehydropiperidine 10. Hydrogenation of 10 and subsequent cyclization mediated by Ph 3P/CBr 4 then afforded the bicyclic product 12, a precursor of indolizidine (−)-209B.
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