| 摘要 |
Process for the preparation of compounds active in the treatment of Parkinson's disease, and such compounds, having general formula (VI) wherein R4 may be, independently, a linear, branched or cyclic, saturated or unsaturated C1-8 alkyl radical, such as, for example, the radicals methyl, ethyl, propyl, butyl, isobutyl, tert-butyl, pentyl, cyclopentyl, hexyl, cyclohexyl and octyl. The process utilizes as starting materials the compound of formula (I) wherein R1 represents a linear, branched or cyclic, saturated or unsaturated C1-8 alkyl residue.
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