HEJ Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan.
Nat Prod Res. 2009;23(17):1603-8. doi: 10.1080/14786410802573958.
Two new triterpenoid isomers alpha-neriursate (1) and beta-neriursate (2) have been isolated from the fresh, uncrushed leaves of Nerium oleander and their structures elucidated as 3alpha-acetophenoxy-urs-12-en-28-oic acid and 3beta-acetophenoxy-urs-12-en-28-oic acid, respectively. The structure elucidation is based on spectroscopic methods, including 1D ((1)H NMR, (13)C NMR) and 2D ((1)H-(1)H COSY, NOESY, HMQC, HMBC and J-resolved) NMR data and chemical transformation.
从夹竹桃新鲜未破碎的叶子中分离得到两种新的三萜异构体 α-neriursate（1）和β-neriursate（2），并将其结构鉴定为 3α-乙酰苯氧基-urs-12-烯-28-酸和 3β-乙酰苯氧基-urs-12-烯-28-酸。结构鉴定基于光谱方法，包括 1D（（1）H NMR、（13）C NMR）和 2D（（1）H-（1）H COSY、NOESY、HMQC、HMBC 和 J-分辨）NMR 数据和化学转化。
