Browsing by Author "Saitz Barría, Claudio"
Now showing items 1-20 of 46
-
(MARCEL DEKKER INC, 1992)The synthesis of pyranoquinone 9 starling from hydroxyquinone 4 through Michael adduct 5 is described.
-
(Thieme Stuttgart, 1999)Isocianates and isothiocyanates are readily transformed into the corresponding symmetric N,N'-disubstituted ureas and thioureas upon treatment with pyridine-water with no formation of side products. Evidence is shown for ...
-
(Bentham Science Publishers, 2003)The present review discusses the synthetic strategies of new ligands exhibiting mainly 5-HT1A binding affinities. Specifically we focused our attention in the synthesis of compounds structurally related to arylpiperazine, ...
-
(WILEY-V C H VERLAG GMBH, 2000-11)The easy transformation of 5,11,17,23-tetra-tert-butyl-25,27-bis(aminoethoxy)-26,28-dihydroxycalix[4]arene (2) into 5,11,17,23-tetra-tert-butyl-26,28-dihydroxy-25,27-bis(2-iso-thiocyanoethoxy)calix[4]arene (3) and ...
-
(1998)The 1H and 13C NMR spectra of 2-phenyl-3H-naphtho[2,1-b][1,4]oxazin-3-one, 2-p-methoxyphenylnaphtho[1,2-d]oxazole and 2-phenylnaphtho[1,2-d]oxazole were totally assigned using a combination of one-and two-dimensional NMR ...
-
(JOHN WILEY & SONS LTD, 1998-06)The H-1 and C-13 NMR spectra of 2-phenyl-3H-naphtho[2,1-b][1,4]oxazin-3-one, 2-p-methoxyphenylnaphtho[1,2-d]oxazole and 2-phenylnaphtho[1,2-d]oxazole were totally assigned using a combination of one-and two-dimensional NMR ...
-
(2001)Activation parameters for the rotation around the methylene-nitrogen single bond found in a series of four 2,2'-disubstituted N-acetyl-N-phenylbenzylamines, dissolved in DMSO-d6, were measured employing the temperature ...
-
(2011)Several reviews have been published on sesquiterpenes, and on drimane-type sesquiterpenes, going through drimenol and related compounds among others. However, to our knowledge, this is the first review exclusively on ...
-
(Universidad de Chile, 2007)La depresión es un trastorno del estado anímico, que se manifiesta con pérdida de interés o del placer por vivir, sentimientos de culpa o baja autoestima, alteraciones del sueño, del apetito y baja capacidad de concentración ...
-
(AMER CHEMICAL SOC, 2000-11-17)The photophysical and photochemical behavior of 1-methyl-3-phenylquinoxalin-2-one (MeNQ) and 3-phenylquinoxalin-2-one (HNQ) in the presence of amines is reported. While HNQ fluorescence shows an auxochromic effect and a ...
-
(MARCEL DEKKER INC, 2002)The abundant aporphine alkaloid (S)-(+)-boldine (1) was selectively nitrosated with sodium nitrite in acetic acid affording 8-nitrosoboldine (2) which was hydrogenated catalytically to give 8-aminoboldine (3). The latter ...
-
(MARCEL DEKKER INC, 2001)A method that allows the synthesis of 4 different heterocyclic systems of fused aryl oxazoles, i.e., naphtho[1,2-d], naphtho[2,1-d], naphtho[2,3-d], and benzo[d]oxazoles in reasonable yield is del scribed. This method ...
-
(JOHN WILEY & SONS LTD, 2001-06)The novel heterocycles 1,11-dimethoxy-2-hydroxy-6-methyloxazolo[4,5-k]-5,6,6a,7-tetrahydro-4H-dibenzo [de,g]quinoline, 1,12-dimethoxy-2-hydroxy-6-methyl-9-phenyl-10H-oxazin[5,6-k]-5,6,6a,7-tetrahydro-4H-dibenzo ...
-
(2011)During the 1H NMR study of the photoreduction of aza-oxoisoaporphines, aza-OIAs, (7H-benzo[e]perimidin-7-ones) by amines we found an unexpected H/D isotopic exchange in the aromatic positions 4 and 6 of these molecules. ...
-
(AMER CHEMICAL SOC, 2002-08-08)Photoreduction of 3-phenylquinoxalin-2-ones, XNQ, by triethylamine, TEA, gives a metastable semireduced quinoxalin-2-one via an electron-proton-electron transfer, with unit quantum yields at high amine concentrations. ...
-
(AMER CHEMICAL SOC, 2005-07-07)Photoreduction by amines of oxoisoaporphine dyes occurs via a stepwise mechanism of electron-proton electron transfer that leads to the metastable N-hydrogen oxoisoaporphine anion. During photoreduction that occurs from ...
-
(2009)Photoreduction of oxoisoaporphine (OIA) (l-aza-benzo-[de]anthracen-7-one) and its 5-methoxy (5-MeOOIA) derivative by selected amines (two non-a-hydrogen-donating amines (l,4-diaza[2.2.2]-bicyclooctane (DABCO) and ...
-
(ROYAL SOC CHEMISTRY, 2004)Photoreduction of 5,6-dimethoxy-, 5-methoxy- and 2,3-dihydro-7H-dibenzo[de, h] quinolin-7-one (A) by tertiary amines in oxygen-free solutions generates long-lived semi-reduced metastable photoproducts, A - NH-, via a ...
-
(1996)The azomethin ylide of the 2-p-methoxyphenyl-4-phenyl-2-oxazolin-5-one underwent 1,3-dipolar cycloaddition to both tautomers of the 1-nitroso-2-naphthol. The reaction yields two naphthoxazoles: 2-phenylnaphtho[1,2-d]oxazole, ...
-
(Sociedad Chilena de Química, 1996)El azometin-ilido de la 2-p-metoxifenil-4-fenil-2-oxazolin-5-ona reacciona por ciclo adición 1,3-dipolar con ambos tautómeros del 1-nitroso-2-naftol. La reacción forma dos naftoxazoles: 2-fenilnafto[1,2-d]oxazol,2-p-met ...
