Coumarin glycosides ofHaplophyllum performatum. structures of haploperosides C,D, and E

New coumarin glycosides — haploperosides C, D, and E — have been isolated from the epigeal part of theHaplophyllum performatum (MB) Kar et Kir. On the basis of chemical transformations and spectral characteristics, haploperoside D has the structure of 6-methoxy-7-0--L-rhamnopyranosyl-(1 2)--D-glucopyranosyloxy]-2H-benzopyran-2-one, and haploperoside C that of 6-methoxy-7-0--L-rhamnopyranosyl-(1 6)-(2-0-acetyl--D-glucopyranosyloxy)]-2H-benzopyran-2-one. The structure of haploperoside E has been established as 7-0--L-rhamnopyranosyl-(1 2)-0--L-rhamnopyranosyl-(1 6)--D-glucopyranosyloxy]-2H-benzopyran-2-one. The structures of haploperosides A and B have been refined. An assignment has been made of the carbon signals in the¹³C NMR spectra of haploperosides A, D, C, and E.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 27–35, January–February, 1985.