https://orcid.org/0000-0001-9955-959X
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Abstract
One pair of new amides enantiomers (1a and 1b) and two known amides were isolated from the rhizomes of Polygonum cuspidatum. Their structures were established using UV, IR, HRESIMS, and NMR data. Notably, compound 1 possesses unique C-C connection between feruloyltyramine and resveratrol. Their absolute configurations were determined by the ECD method. All compounds were evaluated for their α-glucosidase inhibitory activity and compounds 2 and 3 showed significant inhibitory activity with IC50 values of 2.82 and 13.06 μmol/L, respectively (positive control acarbose, IC50 385 μmol/L).
Graphical Abstract
Disclosure statement
No potential conflict of interest was reported by the authors.
Additional information
Funding
This study was supported by the CAMS Innovation Fund for Medical Sciences (CIFMS) (No. 2019-I2M-1-005); Major Thirteenth Five-Year Plan Projects for Natural Products (No. 2018ZX09711001-008).