ABSTRACT
Objective: To investigate the chemical constituents of Blaps rynchopetera. Methods: Compounds were isolated and purified on silica gel, Sephadex LH20, ODS, and D101 column chromtography. The structures were elucidated on the basis of NMR spectral data and HR-ESI-MS. Results: Ten cyclodipeptides were isolated from the n-butyl extract fraction of B. rynchopetera, and their structures were determined as cyclo (Leu-Pro) (1), cyclo (Val-Pro) (2), cyclo (Ile-Pro) (3), cyclo (Ser-Pro) (4), cyclo (Tyr-Pro) (5), cyclo (Val-Ile) (6), cyclo (Val-Leu) (7), cyclo (Val-Tyr) (8), cyclo (Ile-Tyr) (9), and cyclo (Phe-Tyr) (10). Conclusion: All the 10 compounds are isolated from B. rynchopetera for the first time.
ABSTRACT
Objective: To study the chemical constituents from the leaves of Salix matsudana. Methods: The chemical constitunents were isolated by various column chromatographic methods. The structures of the compounds were elucidated on the basis of physiochemical properties and spectral analyses. Results: Six compounds were named as 5-β-D-glucosyloxy-7-hydroxychromone (1), 5, 7-dihydroxychromone (2), (2-hydroxyphenzyl)-O-β-D-glucopyranoside (3), vanillic acid-4-O-β-D-glucoside (4), cyclo (val-pro) (5), and gallic acid (6). Conclusion: Compound 1 is a new compound named matsudoside A, compounds 2-6 are obtained from this plant for the first time.