Synthesis of dammarenolic acid derivatives with a potent α-glucosidase inhibitory activity
2019
Dammarenolic acid (DA) is an A-seco-
dammarane
triterpenoids, isolated from
Dipterocarpus alatusresin. DA was modified including reactions of esterification and amination with
heterocyclic aminesand l-amino acids. The structures of new compounds were confirmed by MS, 1H NMR, and 13C NMR spectroscopic analyses and their activities against α-
glucosidaseand acetylcholinesteras were studied. The cytotoxic activity of DA was screened using a broad panel of 60 human cancer cell lines and it has cytotoxic effect for a variety of human tumor cell lines (leukemia, non-small cell lung cancer, colon cancer, CNS cancer, melanoma, ovarian cancer, renal cancer, breast cancer). All A-seco-
dammaranederivatives exhibited very low or no activity against achetylcholinesterase. The majority of new compounds demonstrated higher antidiabetic activity against α-
glucosidasecompared with starting dammarenolic acid. The methyl dammarenoloate determined as a
lead compoundwith the IC50 value of 0.037 μM being about 4800-fold more active than
acarboseand 108-fold more active than the native DA with the IC50 value of 4.0 μM.
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