Chemical constituents from the leaves of Psidium guajava.
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.
H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi-75270, Pakistan. sabira@khi.comsats.net.pk
Sabira
S
Begum
Syed Imran
SI
Hassan
Syed Nawazish
SN
Ali
Bina S
BS
Siddiqui
D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D031647:Psidium / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification
D010936:Plant Extracts; D014315:Triterpenes; C013330:uvaol