Constituents of Erythroxylon monogynum Roxb. Part II. Erythroxydiols X, Y, and Z; two novel skeletal types of diterpenoids

Abstract
The constitution and stereochemistry of erythroxydiols X (III) and Y (IV) is indicated by their spectroscopic properties and chemical reactions, in particular their conversion by acid into the same major products, erythroxydiol Z (IV: Δ3(4)-isomer) and (X). The structures and absolute configurations of the three diols are supported by conversion of deoxyrosenonolactone (XIX) and the diol (X), respectively, into the diene (XIV) and its antipode

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