| abstract |
The invention relates to a process suitable for large-scale industrial use for preparing compounds of general formula (I) n n n wherein: n R 1 denotes a group selected from among methyl, ethyl, propyl, cyclopentyl, cyclohexyl, phenyl, benzyl and —C(Me 2 )phenyl, each of which is optionally mono-, di- or trisubstituted by hydroxy; and, n R 2 denotes a group selected from among methyl, ethyl, propyl and benzyl. |