| 摘要 |
The present invention relates to a process for the preparation of compounds of the general formula Igeneral formula II <IMAGE> (II) with amines of the general formula III <IMAGE> (III) wherein R1 and R2 independently of one another denote hydrogen, (C1-C4)-alkyl, C1-C4)-hydroxyalkyl or (C5-C6)-cycloalkyl, or, together with the nitrogen atom carrying them, form (C4-C6)-heterocyclyl and R3 and R4 independently of one another denote hydrogen, (C1-C4)-alkyl, (C1-C4)-hydroxyalkyl, (C1-C2)-alkylcarbonyl or tosyl.
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