1H and13C NMR spectra and the structure of a new coumarin, C-glycoside dauroside D, fromHaplophyllum dauricum

On the basis of chemical transformations,¹H and¹³C NMR spectra, the structure of dauroside D isolated fromHaplophyllum dauricum has been established as 6-C--D-glucopyranosyl-5,7-dihydroxycoumarin. Some interesting features of the¹H NMR spectra of its acetate have been reported and an assignment of the signals in its¹H and¹³C NMR spectra has been made. Dauroside D is the first natural coumarin C-glycoside.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 441–445, July–August, 1983.