Abstract
The diastereospecific formation of β-N-glycosidically linked α,β-unsaturated δ-aminocarbonyl
derivatives, in the form of (S )-δ-amino-δ-arylpent-2-enoic
ester, has been achieved in high yield via a vinylogous Mannich
reaction, utilizing poly-O-pivaloylated d -galacosylamine
as the chiral auxiliary. (S )-6-p -Tolylpiperidine-2-one can be stereoselectively
synthesized from (S )-δ-amino-δ-arylpent-2-enoic
ester by sequential hydrogenation of the double bond, cyclic lactam
formation, and removal of the N-glycosidic auxiliary under basic
conditions.
Key words
vinylogous Mannich reaction - carbohydrate - chiral auxiliary - stereoselective synthesis - 6-arylpiperidin-2-ones
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18 Crystallographic data for the structural
analysis of compound 5b has been deposited
at the Cambridge Crystallographic Data Centre under No. CCDC 802525. These
data can be obtained free of charge by contacting The Cambridge
Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ,
UK; fax: +44(1223)336033; E-mail: deposit@ccdc.cam.ac.uk.