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- W2078691609 abstract "A Simple Entry into the Series of Tetracyclic Hetero- and Secoyohimbanes, Strychnos and Oxindole Alkaloids The divinylogous urethane 4a reacts in diluted acetic acid to give the indolochinolizine 9 (yield 40%). The total amount grows up to 65%, if compound 14, prepared from 4a in nearly quantitative yield, is allowed to react with trifluoroacetic acid for a few minutes. Similarily, 4b and 4c give by treatment with SnCl2 and heat in an [4+2]-cycloaddition reaction the spiroindolines 17 and 18. Oxytryptamine reacts with 2 moles of 2 to give immediately the spirooxindole 21. This compound can be rearranged to give 23 (after treatment with acid, reduction and catalytic hydrogenation). 23 has the cis-configuration of rhyncophylline." @default.
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- W2078691609 date "1994-02-14" @default.
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- W2078691609 title "Ein einfacher Zugang zu den tetracyclischen Vorläufern der Hetero- und Secoyohimbane, Strychnos- und Oxindolalkaloide" @default.
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- W2078691609 doi "https://doi.org/10.1002/jlac.199419940208" @default.
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