| 摘要 |
Process for the preparation of compounds of general formula (I), in which R is hydrogen or a group of formula -SO2R1 R1 is C1-6-alkyl; R2 is hydrogen or C1 -6- alkyl; R3 is C1-6-alkyl; R4 is C1-6-alkyl, characterized in that, in a first stage, a compound of formula (II), in which R3 and R4 have the abovementione d meaning, is reacted in the presence of a Lewis acid with 4-fluoro-benzonitri le to give a compound of general formula (III), in which R3 and R4 have the abovementioned meaning and in a second stage the compound of formula (III) obtained is reacted with the compound of formula (IV), in which R and R2 hav e the abovementioned meaning, to give the final product of formula (I).</SDOAB >
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