| 摘要 |
This invention relates to a process for the preparation of compounds of the formula: <IMAGE> (I) in which R1 and R2 may represent hydrogen or a lower alkyl or optionally substituted phenyl radical, comprising aminating a derivative of the formula: <IMAGE> (II) in which R3 is an optionnally substituted alkyl, aryl or aralkyl group, and R1 and R2 are as defined for formula (I).
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