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ChemInform Abstract 8α,14α-Epoxides can be synthesized by direct oxidation of the corresponding 8(14)-olefins. The preparation of 8β,14β-epoxides becomes possible by treatment of the 8(14)-olefins with NBS and subsequent cyclization of the bromohydrins thus obtained.
1,4‐Dihydrophthalazine‐1,4‐dione is used as diene protecting group in an efficient multistep procedure for the synthesis of the title compound (VIII) from the compound (I) derived from ergosterol.
Durch Epimerisierung und nachfolgende Reduktion wird aus dem 16α‐Bromöstron‐äther (I) das Bromhydrin (II) erhalten, das sich thermisch zu (III) epimerisieren läßt. Aus (II) kann ferner das (I)‐Epimere (IV) gewonnen werden.
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