p-Toluenesulfonic acid → Methyl 3-amino-4-methyl-5-(1H-pyrrol-1-yl)benzoate

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Reaction Steps

A mixture of 18 g. of methyl 3,5-diamino-4-methylbenzoate, 0.7 g. of p-toluenesulfonic acid, 8.2 g. of sodium acetate, 32 g. of diethoxytetrahydrofuran, 10 ml of glacial acetic acid, 100 ml. of ethanol and 100 ml. of water was boiled at reflux for 3 hours. The alcohol was removed in vacuo and the residue extracted with ethyl acetate. The ethyl acetate solution was washed with water, dried over sodium sulfate and evaporated. By purification of the residue over aluminum oxide with ethyl acetate and recrystallization from high-boiling petroleum ether, there was obtained methyl 3-amino-4-methyl-5-(pyrrol-1-yl)benzoate, having a melting point of 112° C.

Provenance & Evidence