Tetrahedron Letters p. 7847 - 7850 (1999)
Update date:2022-08-03
Topics:
Loh, Teck-Peng
Zhou, Jian-Rong
Li, Xu-Ran
Sim, Keng-Yeow
(S)-Nornicotine 2 was synthesized in four steps. A key step in the synthesis involved reductive aminocyclization of a 1,4-ketoaldehyde with 2,3,4,6-tetra-O-pivaloyl-β-D-galactosylamine 1 in the presence of sodium cyanoborohydride, diastereoselectively affording the corresponding stereoisomer 6 in 45% yield. The aminosugar moiety could be easily removed by acidic hydrolysis to furnish 2. The aminocyclization was further extended to asymmetric syntheses of novel chiral 2-(2'-pyrrolidyl)-pyridine ligands 12 and 13.
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