Artículos de revistas: Recent submissions

Now showing items 3981-4000 of 4968

    • SYNTHESIS OF 2-ARYL-l,3-PROPANEDIAMlNES USING A ONE-POT KNOEVENAGEL-MICHAEL SEQUENCE 
      Iturriaga-Vásquez, Patricio; Lühr-Sierra, Susan; Caroli Rezende, Marcos; Cassels Niven, Bruce (Sociedad Química de Chile, 2006)
      A simple synthetic route for the preparation of 2-phenyl-I,3-propanediamines, based on a Knoevenagel-Michael double .:ondensation followed by reduction, was developed using nitromethane as reagent and solvent, and sodium ...
    • Trypanocidal effect of boldine and related alkaloids upon several strains of Trypanosoma cruzi 
      Morello Casté, Antonio; Lipchenca, I.; Cassels Niven, Bruce; Speisky Cosoy, Hernán; Aldunate, J.; Repetto Scaramelli, Yolanda (Elsevier Science Ltd., 1993-11-01)
      The alkaloids boldine, glaucine, predicentrine, apomorphine, coclaurine, norarmepavine and codeine were tested against the epimastigotes of the Tulahuén and LQ strains and the DM 28c clone of Trypanosoma cruzi. The ...
    • AISLAMIENTO DE DIOSGENINA DE SOLANUM TOMATILLO 
      Morales, R.; Urzúa, A.; Cassels Niven, Bruce (Universidad de Santiago de Chile, Direccion de Planificacion y Desarrollo II, 1974)
      De hojas y tallos de Solanum tomatillo recolectado en diciembre de 1971 en los faldeos del cerro Lo Curro (Santiago), fue aislada una sapogenina esteroidal caracterizada como diosgenina, con un rendimiento de O,002rPlo. ...
    • Cardiovascular Effects of Plant Secondary Metabolites Norarmepavine, Coclaurine and Norcoclaurine 
      Morales, M. A.; Bustamante, S. E.; Brito, G.; Paz, D.; Cassels Niven, Bruce (John Wiley & Sons, Ltd., 1997-10-09)
      Tbe cardiovascular etTeets of (±)-norannepavine, a benzylisoquinoline alkaloid of natural origin, have been detennined on anaesthetized rats in vivo, on spontaneously beating atria and on aortic smooth muscle. In aorta, ...
    • SINTESIS DE 1-ARIL-2-NITROALQUENOS ANTITUMORALES 
      Cassels Niven, Bruce; Herreros, S.; Ibáñez, C.; Rozende, M. C.; Sebastián, C.; Sepúlveda, S. (Asoc. Quím. Argentina, 1981-12)
      l-Aryl-2-nitroalkenes can. ba synthesized mest convéniently by refluxing aromatic aidehydes with nitromethane 01' nitroethane in acetic acid using n-butyla llIineas a catalyst •.{ In this way' seventeen nev cOIIl'PC'lmdosf ...
    • One- and Two-Dimensional NMR in the Structure Determination of 3B-Acetoxy-17B,21B-epoxyhopane from Centaurea ... 
      Hartmann, Rudolf; Breitmaier, Eberhard; Camargo Grandón, Rodrigo; Negrete Córdova, Rosa; Backhouse Erazo, Nadine; Delporte Vergara, Carla; Cassels Niven, Bruce (Johann Ambrosius Barth, 1992-03-27)
    • Protective Effect of Boldine in Experimental Colitis 
      Gotteland, Martín; Jiménez, Inés; Brunser, Oscar; Guzmán, Leda; Romero, Sergio; Cassels Niven, Bruce; Speisky Cosoy, Hernán (Georg Thieme, 1996-11-23)
      The cytoprotective and anti-inflammatory effects of boldine in an experimental model of acute colitis are reported. The administration of boldine to animals with colitis induced by the intrarectal administration of ...
    • FLAVONOIDS FROM THE TWIGS OF EUCRYPHIA GLUTINOSA 
      Sepúlveda Boza, Silvia; Delhvi, Sualaheen; Cassels Niven, Bruce (Pergamon Press Ltd., 1992-08-21)
      The rare dihydroquercetin 3-0-/3-0-xyloside, caryatin 7-0-/3-0-glucoside and the previously unknown 6-methoxylated flavonoid glycoside jaceidin 5-0-/3-0-glucoside were isolated from twigs of Eucryphia glutinosa where they ...
    • CALAFATIMINE, A NEW IMINO BISBENZYLlSOQUINOLINE ALKALOID 
      Fajardo, Víctor; Garrido, Margarita; Cassels Niven, Bruce (ELSEVIER, 1980-10-13)
      A new bisbenzylisoquinoline alkaloid fran Berberis buxifolia was chemically correlated with ealafatine. On this basis, and using spectranetric evidence, structure 1is proposed for ealafatirnine. The stereochanistry ...
    • USO Y PRINCIPIOS ACTIVOS DE BREBA.JES ALUCINOGENOS DEL UCAYALIS Y DEL AMAZONAS PERUANO 
      Delgado, María Cristina; Urzúa, A.; Cassels Niven, Bruce (Universidad Técnica del Estado, 1972-07)
      Se describe el uso de brebajes preparados con tallos de Banisteriopsis y hojas de Psychotria por la tribu de los Shipibos y en la ciudad de [quitos. El análisis de una muestra de la especie de Banisteriopsis usada, ...
    • CACTACEAE ISOLATION OF CANDICINE FROM TRICHOCEREUS CHILENSIS 
      Cortés, M.; Garbarino, J. A.; Cassels Niven, Bruce (ELSEVIER, 1971-07-30)
      Trichocereus chilensis (Colla) Br. & R. is the only Chilean member of its genus figuring in the literature as having been examined for alkaloids, although previous reports are negative. Djerassi and coworkers1 found no ...
    • CHlLENlNE: AN ISOINDOLOBENZAZEPlNE ALICALOID 
      Fajardo, Víctor; Elango, Varadaraj; Cassels Niven, Bruce; Shamma, Maurice (Pergarnon Press Ltd., 1981-09-24)
      (i:)-ChiZenine (3), the first isoindolobenaaaepine atkatoid, has been found in BerbeX'is empem[otia Lam. (Berberidaoeae).
    • Calafatina, una bisbencilisoquinolina novedosa 
      Fajardo, V.; Urzúa, A.; Cassels Niven, Bruce (Universidad Técnica del Estado, 1978-11)
      La calafatina es un componente importante de las mezclas de alcaloides no cuaternarios de la corteza de tronco y de las raiees de Berberis buxifolia Lam. ("calafate"). Sobre la base de estudios espectrométricos de esta ...
    • CALAFATINE, AN UNUSUAL BISBENZYLISOQUINOLINE ALKALOID 
      Fajardo, Víctor; Urzúa, Alejandro; Cassels Niven, Bruce (ELSEVIER, 1979-09-26)
      Spectrometric and chemical evidence is presented that calafatine, an alkaloid from Berberis buxifolia, has structure l. The substitution pattern on ring E is unique ln isoquinoline alkaloids.
    • Efecto de un extracto seco de boldo sobre el tránsito intestinal oro-cecal en voluntarios sanos 
      Gotteland, Martín; Espinoza Madariaga, Julio; Cassels Niven, Bruce; Speisky Cosoy, Hernán (Sociedad Médica de Santiago, 1995-06-27)
      Boldo (Peumus boldus Molina) is a widely used medicinal planto However, its pbysiological effects are not well known. Recent studies in animals sbmoed tbat certain components o/ boldo relax smootb muscle and prolong ...
    • (+ )-9C(-HYOROXYMATRINE FROM SOPHORA MACROCARPA 
      Negrete Córdova, Rosa; Cassels Niven, Bruce; Eckhardt, Gert (Pergamon Press Ltd., 1983-01-21)
      A new quinolizidine alkaloid, (+ )-9cx-hydroxymatrine, was isolated from the lea ves of Sophora macrocarpa. Its structure was determined by a combination of spectroscopic methods, among which nuclear Overhauser enhancement ...
    • CYCLOPEPTIDE ALKALOIDS OF ZIZYPHUS OENOPLIA 
      Cassels Niven, Bruce; Eckardt, G.; Kaussmann, E. U.; Tschesche, R. (Pergamon Press, 1974-02-20)
      The known alkaloids zizyphine-A (1) and -B (2), abyssinine-A (4) and -B (5), and the previously undescribed zizyphine-C (3), -D (6) and -E (7) have been isolated from the stem bark of Zizyphus oenoplia. The structures ...
    • SPECTROSCOPIC CHARACTERIZATION OF A NEW HALLUCINOGEN : 1-(2,5-DIMETHOXY- 4-NITROPHENYL)-2-AHINOPP.OPANE (DON). 
      Gómez Jeria, Juan; Cassels Niven, Bruce; Clavijo Campos, Ernesto; Varas, V.; Quintana, R.; Saavedra Aguilar, Juan Carlos (U. S. Department of Justice Drug Enforcement Administration, 1986-11)
      We present the IR, UV, 1H- and 13C-NMR spectra of 1-(2,5- dimethoxy-4-nitrophenyl)-2-aminopronane (DON), whose hallucinogenic properties have been recently discovered. The data presented here should orove useful for the ...
    • SOLANACEAE SOLASODINE GLYCOSIDES AND DIOSGENIN FROM SOLANUM PINNATUM 
      Urzúa, A.; Cassels Niven, Bruce (Elsevier, 1972-08-14)
      A sample of a plant growing near Longotoma, Aconcagua, identified as Solanum pinnatum Cavo (Voucher specimen No. BClO deposited in the herbarium of the Museo Nacional de Historia Natural, Santiago), wás examined for ...
    • ALKALOIDS OF SOPHORA TETRAPTERA SENSU REICHE 
      Urzúa, A.; Cassels Niven, Bruce (ELSEVIER, 1970-03-17)
      Sophora tetraptera sensu Reiehe seeds were examined for alkaloids. Cytisine, methyleytisine and matrine were isolated, and a fourth alkaloid was deteeted by TLC. The relative amounts of the three major alkaloids support ...