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- W2099677941 abstract "The chloroform solvate of uncarine C (pteropodine), (1′S,3R,4′aS,5′aS,10′aS)-1,2,5′,5′a,7′,8′,10′,10′a-octahydro-1′-methyl-2-oxospiro[3H-indole-3,6′(4′aH)-[1H]pyrano[3,4-f]indolizine]-4′-carboxylic acid methyl ester, C21H24N2O4·CHCl3, has an absolute configuration with the spiro C atom in the R configuration. Its epimer at the spiro C atom, uncarine E (isopteropodine), (1′S,3S,4′aS,5′aS,10′aS)-1,2,5′,5′a,7′,8′,10′,10′a-octahydro-1′-methyl-2-oxospiro[3H-indole-3,6′(4′aH)-[1H]pyrano[3,4-f]indolizine]-4′-carboxylic acid methyl ester, C21H24N2O4, has Z′ = 3, with no solvent. Both form intermolecular hydrogen bonds involving only the oxindole, with N⋯O distances in the range 2.759 (4)–2.894 (5) Å." @default.
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- W2099677941 date "2001-04-15" @default.
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- W2099677941 title "Two stereoisomeric pentacyclic oxindole alkaloids from<i>Uncaria tomentosa</i>: uncarine C and uncarine E" @default.
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- W2099677941 doi "https://doi.org/10.1107/s0108270101000932" @default.
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