title: Tectone, a new antihyperglycemic anthraquinone from Tectona grandis leaves.
abstract: A new anthraquinone (3,8-dihydroxy-2-methyl anthraquinone), named tectone (1), along with fourteen known compounds (2-15) comprised of five terpenoids (2-5, 15), four flavonoids (6-9), three flavone glycosides (10-12), and two phenolic glycosides (13-14) were isolated from the chloroform and n-butanol fractions of the ethanol extract of Tectona grandis leaves. Attempts were made to synthesize compound 1. This resulted in the synthesis of three additional anthraquinones (16-18), out of which compound 16 is new. The structures of all compounds were established by spectral analysis. The isolated and synthesized compounds were evaluated for their antihyperglycemic activity. Compounds 1, 2, 4 and 14 showed significant antihyperglycemic activity in streptozotocin-induced diabetic rats at a dose of 100 mg/kg body weight, which is comparable to the standard drug metformin.
authors.affiliation: Medicinal and Process Chemistry Division, Central Drug Research Institute, CSIR, Lucknow 226 001, India.
authors.forename: Nivedita
authors.initials: N
authors.lastname: Shukla
authors.forename: Manmeet
authors.initials: M
authors.lastname: Kumar
authors.lastname: Akanksha
authors.forename: Ghufran
authors.initials: G
authors.lastname: Ahmad
authors.forename: Neha
authors.initials: N
authors.lastname: Rahuja
authors.forename: Amar B
authors.initials: AB
authors.lastname: Singh
authors.forename: Arvind K
authors.initials: AK
authors.lastname: Srivastava
authors.forename: Siron M
authors.initials: SM
authors.lastname: Rajendran
authors.forename: Rakesh
authors.initials: R
authors.lastname: Maurya
mesh_terms: D000818:Animals; D000880:Anthraquinones / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D003921:Diabetes Mellitus, Experimental / Q000188:drug therapy; D007004:Hypoglycemic Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D013058:Mass Spectrometry; D008687:Metformin / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D051381:Rats; D017207:Rats, Sprague-Dawley; D029648:Verbenaceae / Q000737:chemistry*
chemical_list: C549356:3,8-dihydroxy-2-methyl anthraquinone; D000880:Anthraquinones; D007004:Hypoglycemic Agents; D010936:Plant Extracts; D008687:Metformin