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4-Alkylcoumarins and a phloroglucinol from the stem bark of Calophyllum gracilentum
- Lim, Chan Kiang, Ham, Yenn Pinn, Lim, Li Qing, Jong, Vivien Yi Mian
- Phytochemistry letters 2019 v.30 pp. 99-102
- Calophyllum, bark, coumarin, nuclear magnetic resonance spectroscopy, spectral analysis
- Three new 4-alkylcoumarins, gracilenins A–C (1-3) and a new phloroglucinol, gracilenol (4), along with two known compounds, euxanthone and friedelin were isolated from the stem bark of Calophyllum gracilentum. Their structures were established on the basis of 1D and 2D NMR spectroscopic data and HRESIMS analysis. This is the first report of 4-(butan-2-yl)coumarin derivatives in this genus.