Abstract
From the epigeal part ofHaplophyllum perforatum we have isolated the coumarins scopoletin (I), scopoletin 7-0-β-D-glucopyranoside (II) and the new coumarin glycoside haploperoside A (III), mp 212–213°C, [α] D 22 −37° (c 0.24, CH3OH). The acid hydrolysis of (III) formed (I) and the monosaccharides D-glucose and L-rhamnose. Partial hydrolysis of (III) with 10% acetic acid led to (II) and L-rhamnose. On the basis of the results of a study of UV, IR, and PMR spectra, and also periodate oxidation and polarimetric analysis the structure of 6-methoxy-7-[0-α-L-rhamnopyranosyl-(2→1)-β-D-glucopyranosyloxy] coumarin has been established for (III). Details of the IR, UV, PMR, and mass spectra are given.
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