Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 17, Issue 1, Pages 66-73Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ob02839g
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- Ministry of Higher Education and Scientific Research of Iraq
- University of Sheffield
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A cascade or domino sequence of condensation of hydroxylamine and an aldehyde to give an oxime, cyclization to a nitrone, and intramolecular 1,3-dipolar cycloaddition has been successfully employed where there is branching at C-4 as a route to the iboga alkaloids. Cyclization occurs with displacement of chloride as a leaving group and intramolecular cycloaddition occurs with an alkene as a dipolarophile. The reaction gives an azabicyclo[2.2.2]octane product containing a fused isoxazolidine as a single stereoisomer and this was converted to an isoquinuclidine that completed a formal synthesis of the alkaloid (+/-)-19-hydroxyibogamine.
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