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A new ent-kaurane diterpenoid from Ixora amplexicaulis
- Chen, Lijun, Zhan, Rui, Jiang, Jinhe, Zhang, Yan, Dong, Yi, Chen, Yegao
- Natural product research 2016 v.30 no.1 pp. 105-109
- Ixora, diterpenoids, nuclear magnetic resonance spectroscopy, stems
- A new ent -kaurane diterpenoid, 6α,16α-dihyroxy -ent -kaurane (1), was isolated from the stems of Ixora amplexicaulis , together with (24 R)-6β-hydroxy-24-ethyl-cholest-4-en-3-one (2), 7 β-hydroxysitosterol (3), maslinic acid (4), 3,3′-bis(3,4-dihydro-4-hydroxy-6-methoxy-2 H -1-benzopyran) (5) and protocatechuric acid (6). Their structures were established by extensive spectroscopic analysis, including 2D NMR techniques. Compounds 2 – 5 were isolated from the genus Ixora for the first time and 6 obtained originally from I. amplexicaulis .