Flavonoids from Lonchocarpus araripensis (Leguminosae): Identification and Total H and C Resonance Assignment

نویسندگان

  • Almi F. Lima
  • Daniele A. Ferreira
  • Francisco J. Q. Monte
چکیده

The NMR study of the flavonoids 6a,11a-dihydro-9-methoxy-6H-benzofuran[3,2-C] benzopiran-3-ol (1) and (2,3cis-3,4-cis-3,4,5,8-tetramethoxy-[1,2 : 6,7]-furanoflavan (2) is described. In addition to convencional 1D NMR methods, 2D shift-correlated NMR techniques (COSY, HMQC, HMBC and NOESY) were used for the complete H and C resonance assignments. The relative stereochemistry at the asymmetric centers was established by nOe difference experiments. The compounds 1 and 2 are novel to Lonchocarpus araripensis.

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تاریخ انتشار 2014