Abstract: 2-Hydroxy-4-(1'-hydroxy-2',6',6'-triméthyl-4-oxo-cyclohex-2'-enyl)-but-3-enoic acid, a new megastigmane derivative, trivially named monanthosin (1), together with eight known compounds (chrysin (2), quercitrin (3), astilbin (4), heptulose (5), allantoin (6), heptitol (7), cis-N-p-coumaroyl tyramin (8) and trans-N-p-coumaroyl tyramin (9)) were isolated from the leaves of Monanthotaxis littoralis (Annonaceae). Structures were assigned by direct interpretation of their spectral data, mainly HR-TOFESIMS, 1D NMR (1H and 13C) and 2D NMR (1H-1H COSY, HSQC, HMBC and NOESY) and by comparison with reported values. The MeOH, EtOAc and n-BuOH extracts as well as compounds 1, 2, 4 and 8 exhibited variable antimicrobial and antioxidant activities. The ethyl acetate extract and compound 4 were the most active samples among extracts and compounds, respectively. The ethyl....
Keyword: Monanthotaxis littoralis; Leaves; Annonaceae; Monanthosin; Antimicrobial; Antioxidant
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