| 摘要 |
A process for the preparation of a compound of formula (V) and salts thereof <IMAGE> (V) wherein R1 is selected from the group consisting of a hydrogen atom, an alkyl radical, a formyl radical and an acyl radical; R2 is selected from the group consisting of an alkoxycarbonyl radical, a hydrazide radical, an acetamido radical, a hydroxymethyl radical, and an alkanoyloxy methyl radical and R3 and R4 are the same or different and each is selected from the group consisting of a hydrogen atom, a hydroxyl radical and an alkanoyloxyl radical; which comprises the step of treating a compound of formula IV <IMAGE> (IV) wherein R1, R2, R3 and R4 are as previously defined with at least one oxidising agent selected from the group consisting of oxidising metal salts, air and oxygen. The above compounds are useful due to their antitumoral activity, and to their use as intermediates of other antitumor drugs.
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