2,2-Diethoxytetrahydrofuran → 3,5-Dimethoxy-4-(pyrrol-1-yl)-benzoic acid methyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 9 g. of diethoxy-tetrahydrofuran and 5 ml. of glacial acetic acid was added dropwise at room temperature to a solution of 10.5 g. of 4-amino-3,5-dimethoxy-benzoic acid methyl ester in 50 ml. of glacial acetic acid with stirring. The mixture was stirred at 100° C. for an additional 30 minutes, cooled with ice, filtered under vacuum, dried and recrystallized from cyclohexane, whereby there was obtained 3,5-dimethoxy-4-(pyrrol-1-yl)-benzoic acid methyl ester having a melting point of 145°-146° C.

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