| 摘要 |
A novel process the preparation of pentaalkylchromenes of the general formula: <IMAGE> I wherein R denotes a lower alkyl group having 1 to 4 C atoms and R1 denotes a phenyl group which is unsubstituted or substituted by a lower alkyl group having 1 to 4 C atoms, by halogen or by a nitro group, or an alkanoyl group having 1 to 4 C atoms. In the process, a trialkylhydroquinone is reacted with a halogenated butenol to give a substituted tetraalkyhydroquinone, which is oxidized. Then the halogen atom is substituted with a suitable nucleophile and the compound is finally cyclized to give the final product. The pentaalkylchromenes are suitable intermediates for the preparation of hypolipidaemic pharmaceuticals.
|
