Fukiinsäure und 3′‐O‐Methyl‐fukiinsäure, zwei phenolische Hydroxycarbonsäuren aus Piscidia Erythrina

Purification of crude piscidic acid from ‘Cortex Piscidiae Erythrinae’, the root bark of Piscidia Erythrina L. (Papilionaceae), led to the isolation of fukiic acid (5) and 3′‐O‐methyl‐fukiic acid (8). Since partition chromatography with alcoholic solvents produced the corresponding half‐esters as artefacts, the acids were transformed to their methyl esters before separation. Spectroscopic methods and comparison with authentic samples from Petasites japonicus F. SCHMIDT (Compositae) confirmed the structures 5 and 8.