title: Acetyl and butyrylcholinesterase-inhibiting triterpenoid alkaloids from Buxus papillosa.
abstract: Three triterpenoid alkaloids, buxakashmiramine [(20S)-20-dimethylamino-4',6'-dimethoxy-5'-hydroxybenzoylamino-3beta-methyl-buxan-31-ol] (1), buxakarachiamine [(20S)-20-dimethylamino-2'-hydroxy-3beta-methyl-3'-methyl-butanoylamino-9,10-seco-buxa-9(11), 10(19)-dien-31-ol] (2) and buxahejramine [(20S)-20-dimethylamino-2'-hydroxy-3beta-methyl-3'-methyl-pentanoylamino-9,10-seco-buxa-9(11), 10(19)-dien-31-ol] (3) were isolated from the leaves of Buxus papillosa. Four known bases, cycloprotobuxine-C (4), cyclovirobuxeine-A (5), cyclomicrophylline-A (6) and semperviraminol (7) were isolated for the first time from this species. Their structures were established through extensive spectroscopic studies. Most of these compounds exhibited anticholinesterase activity.
authors.affiliation: H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, -75270, Karachi, Pakistan.
authors.lastname: Atta-ur-Rahman
authors.forename: S
authors.initials: S
authors.lastname: Parveen
authors.forename: A
authors.initials: A
authors.lastname: Khalid
authors.forename: A
authors.initials: A
authors.lastname: Farooq
authors.forename: M I
authors.initials: MI
authors.lastname: Choudhary
mesh_terms: D000110:Acetylcholinesterase / Q000187:drug effects*; D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002091:Butyrylcholinesterase / Q000187:drug effects*; D002800:Cholinesterase Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D019684:Magnoliopsida / Q000737:chemistry*; D013057:Spectrum Analysis; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000470:Alkaloids; D002800:Cholinesterase Inhibitors; D014315:Triterpenes; D000110:Acetylcholinesterase; D002091:Butyrylcholinesterase