Abstract
The addition of a natural alkaloid lupinine to acetylene in the presence of superbasic catalytic systems (KOH—DMSO, KOBut—DMSO, KOH—dioxane) under elevated or atmospheric pressure affords O-vinyllupinine (in up to 88% yield), a promising optically active monomer and intermediate for the preparation of new quinolizidine alkaloids. The same vinyl ether was obtained (in 60% yield) by the reaction of lupinine with vinyl acetate in the presence of Hg(OAc)2.
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Oparina, L.A., Tlegenov, R.T., Ermakova, T.G. et al. Nucleophilic addition to acetylenes in superbasic catalytic systems. 12. Vinylation of lupinine. Russian Chemical Bulletin 53, 242–244 (2004). https://doi.org/10.1023/B:RUCB.0000024856.57354.85
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DOI: https://doi.org/10.1023/B:RUCB.0000024856.57354.85