Begum Sabira, Hassan Syed Imran, Ali Syed Nawazish, Siddiqui Bina S
H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi-75270, Pakistan.
Nat Prod Res. 2004 Apr;18(2):135-40. doi: 10.1080/14786410310001608019.
Five constituents including one new pentacyclic triterpenoid guajanoic acid (1) and four known compounds beta-sitosterol (2), uvaol (3), oleanolic acid (4), and ursolic acid (5) have been isolated from the leaves of Psidium guajava. The new constituent 1 has been characterized as 3beta-p-E-coumaroyloxy-2alpha-methoxyurs-12-en-28-oic acid through 2D NMR techniques and chemical transformations. This is the first report of isolation of compound 3 from the genus Psidium.
从番石榴叶中分离出了5种成分，包括一种新的五环三萜类化合物愈创木酸（1）和4种已知化合物β-谷甾醇（2）、羽扇豆醇（3）、齐墩果酸（4）和熊果酸（5）。通过二维核磁共振技术和化学转化，新成分1被鉴定为3β-p-香豆酰氧基-2α-甲氧基乌苏-12-烯-28-酸。这是首次从番石榴属植物中分离出化合物3的报道。
