Chemical constituents of Philippine endemic plants: Arenga tremula blanco and shorea contorta vidal

• Main Author: Fortin, Dalton R.
• Format: text
• Language: English
• Published: Animo Repository 2014
• Online Access: https://animorepository.dlsu.edu.ph/etd_masteral/4651
• Institution: De La Salle University

The dichloromethane extract of the air-dried stems of Arenga tremula Blanco subsp tremula, an endemic ornamental plant afforded 3Ý-methoxy-21ÝH-hop-22(29)-ene (1) and squalene (2), while the leaves yielded lutein (3) and a mixture of stigmasterol (4) and Ý-sitosterol (5) in a 1:2 ratio. The chemical structure of (1) was elucidated by extensive 1D and 2D NMR spectroscopic techniques while 2-4 were identified by comparison of their NMR spectral data with those reported in the literature. New 13C NMR chemical shift values were assigned to (1) based from the 2D NMR spectral data. This is the first report of the isolation of 1-5 from the plant and the first structure elucidation of (1) by extensive 1D and 2D NMR spectroscopy. The dichloromethane extract of the air-dried stems of Shorea contorta Vidal, an endemic and critically endangered tree afforded a mixture of olean-12-en-3-one (1), urs-12-en-3-one (2) and lup-20(29)-en-3-one (3) in a 4:2:1 ratio, while the leaves yielded Ý-sitosterol (4) and lutein (5). The chemical structures of 1-5 were identified by comparison of their 1H and 13C NMR spectral data with those reported in the literature. This is the first report on the isolation of these compounds from the tree.