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Palabra clave:'323403'
Mostrando 1-30 of 42 resultados for "
323403
" en el plazo de PapelesYa-Qi Qiu et al.
Oncotarget, 6(4), 2148-2163 (2015-02-12)
Tylophorine compounds have been the focus of drug development for decades. Tylophorine derivatives exhibit anti-cancer activities but their cellular targets remain unknown. We used a biotinylated tylophorine derivative to probe for the interacting cellular target(s) of tylophorine. Tylophorine directly binds
Hao Yao et al.
Journal of electron microscopy, 60(6), 375-378 (2011-10-05)
A plastic bag method was developed to observe air-sensitive samples on microstructure and phase distribution without exposure to air during the holder transfer process into the transmission electron microscope (TEM). As an example, a type of lithium aluminum hydride (Li(3)AlH(6))
Reversible hydrogen storage via titanium-catalyzed LiAlH4 and Li3AlH6
Chen J, et al.
The Journal of Physical Chemistry B, 105(45), 11214-11220 (2001)
I-Chi Lee et al.
Organic & biomolecular chemistry, 9(22), 7655-7658 (2011-09-17)
Specific deuterated reference compounds were prepared to probe the stereoselectivity of the reductive ring opening of carbohydrate-based benzylidene-type acetals. AlD(3) revealed a retentive stereoselectivity probably through the rare S(N)i (internal nucleophilic substitution) mechanism. An S(N)1-like mechanism occurs in the acid-promoted
Haruki Sashida et al.
Chemical & pharmaceutical bulletin, 52(1), 57-62 (2004-01-08)
The reactions of the 2-benzoselenopyrylium (1A) and 2-benzotelluropyrylium cations (1B) with a variety of nucleophiles have been investigated. LiAlH(4), sodium alkoxide (NaOMe, NaOi-Pr and NaOt-Bu), diethylamine, n-butylamine and acetone reacted with 1 to give the 1H-isochromenes (2) and the corresponding
Steven M Colegate et al.
Journal of ethnopharmacology, 172, 179-194 (2015-06-19)
Asmachilca is a Peruvian medicinal herb preparation ostensibly derived from Aristeguietia gayana (Wedd.) R.M. King & H. Rob. (Asteraceae: Eupatorieae). Decoctions of the plant have a reported bronchodilation effect that is purported to be useful in the treatment of respiratory
Jennifer R Mallette et al.
Journal of chromatography. A, 1364, 234-240 (2014-09-16)
The isomeric truxillines are a group of minor alkaloids present in all illicit cocaine samples. The relative amount of truxillines in cocaine is indicative of the variety of coca used for cocaine processing, and thus, is useful in source determination.
José M Concellón et al.
The Journal of organic chemistry, 71(17), 6420-6426 (2006-08-12)
The reaction of chiral (2R,1'S)- or (2S,1'S)-2-(1-aminoalkyl)epoxides, 1 or 2 with a variety of organolithium compounds to obtain the corresponding (alphaS,betaS)- or (alphaR,betaS)- beta-amino alcohols in enantiopure form is reported. In both cases, the opening of the oxirane ring at
Brandon K Tate et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 21(28), 10160-10169 (2015-06-11)
Alkoxide-bridged disilver cations react with dihydrogen to form hydride-bridged cations, releasing free alcohol. Hydrogenolysis of neutral silver fluorides affords hydride-bridged disilver cations as their bifluoride salts. These reactions proceed most efficiently when the supporting ligands are expanded N-heterocyclic carbenes (NHCs)
Reduction of organic compounds by lithium aluminum hydride. I. Aldehydes, ketones, esters, acid chlorides and acid anhydrides.
Nystrom RF and Brown WG
Journal of the American Chemical Society, 69(5), 1197-1199 (1947)
Yong Ma et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 1001, 202-211 (2015-08-19)
A sensitive UPLC-MS/MS method was established and validated for the quantitation of celecoxib and its metabolites in rat blood. The analytes were extracted from rat blood samples by a salting-out liquid-liquid extraction method followed by the UPLC chromatography. The mass
Masateru Nishihara et al.
Archaea (Vancouver, B.C.), 1(2), 123-131 (2005-04-05)
A choline-containing phospholipid (PL-4) in Methanopyrus kandleri cells was identified as archaetidylcholine, which has been described by Sprott et al. (1997). The PL-4 consisted of a variety of molecular species differing in hydrocarbon composition. Most of the PL-4 was acid-labile
Frédéric Hild et al.
Dalton transactions (Cambridge, England : 2003), (2)(2), 533-540 (2009-12-22)
The tridentate proligands (RNH-o-C6H4)2O (1a, R = C5H9; 1b, R = Cy) were found to readily react with LiAlH4 to yield the corresponding lithium aluminium dihydrido salt species [eta(2)-N,N-{(RN-o-C6H4)2O}AlH(mu-H)Li(THF)]2 (2a, R = C5H9; 2b, R = Cy) in 50% and
Matthias D'hooghe et al.
Organic & biomolecular chemistry, 6(7), 1190-1196 (2008-03-26)
The reactivity of 4-aryl-1-(2-chloroethyl)azetidin-2-ones and 4-aryl-1-(3-bromopropyl)azetidin-2-ones with regard to lithium aluminium hydride has been evaluated for the first time. 4-Aryl-1-(2-chloroethyl)azetidin-2-ones were transformed into novel 1-(1-aryl-3-hydroxypropyl)aziridines through an unprecedented conversion of beta-lactams into 2,3-unsubstituted aziridine derivatives. Unexpectedly, 4-aryl-1-(3-bromopropyl)azetidin-2-ones underwent dehalogenation towards
Takashi Ikegami et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 804(1), 197-201 (2004-04-20)
Bisphenol A (BPA) recognition materials were synthesized by a covalent imprinting technique using BPA-dimethacrylate or BPA-diacrylate as the template monomer. Binding sites in the polymers consisted of two hydroxyl groups that are generated by reducing the ester bonds of the
Jae Y Lee et al.
Journal of biomedical materials research. Part A, 103(6), 2126-2132 (2014-10-09)
Electrically conducting polymers (CPs) have been recognized as novel biomaterials that can electrically communicate with biological systems. For their tissue engineering applications, CPs have been modified to promote cell adhesion for improved interactions between biomaterials and cells/tissues. Conventional approaches to
Cascade reactions using LiAlH4 and grignard reagents in the presence of water.
M Brett Runge et al.
Angewandte Chemie (International ed. in English), 47(5), 935-939 (2007-12-18)
Renewable sulfur-containing thermoplastics via AB-type thiol-ene polyaddition
van den Berg O, et al.
European Polymer Journal, 49(4), 804-812 (2013)
Galith Abourbeh et al.
EJNMMI research, 5, 4-4 (2015-04-09)
Non-small cell lung carcinoma (NSCLC) represents approximately 80% of lung cancer cases, and over 60% of these tumors express the epidermal growth factor receptor (EGFR). Activating mutations in the tyrosine kinase (TK) domain of the EGFR are detected in 10%
Mitsuteru Numazawa et al.
Chemical & pharmaceutical bulletin, 54(4), 554-556 (2006-04-06)
Reduction of a double bond at C-1 of 1,4-dien-3-one steroids 7 and 8 with LiAl2H4 in THF or NaB2H4 in MeOH and H2O gave stereospecifically [1alpha-2H]-labeled 4-en-3-one steroids 9 and 10, respectively. When the deuterated solvents, MeO2H and 2H2O, were
Reduction of Organic Compounds by Lithium Aluminum Hydride. III. Halides, Quinones, Miscellaneous Nitrogen Compounds1.
Nystrom RF and Brown WG
Journal of the American Chemical Society, 70(11), 3738-3740 (1948)
Pseudo-allosteric recognition of mandelic acid with an enantioselective coordination complex.
Jungseok Heo et al.
Angewandte Chemie (International ed. in English), 45(6), 941-944 (2005-12-31)
Jin Woo Park et al.
Archives of pharmacal research, 37(12), 1560-1569 (2013-11-21)
Risedronate is widely used clinically to treat osteoporosis, Paget's disease, hypercalcemia, bone metastasis, and multiple myeloma. However, its oral efficacy is restricted due to its low bioavailability and severe gastrointestinal adverse effects. This study was designed to evaluate the effect
Sonja Stanković et al.
Organic & biomolecular chemistry, 8(19), 4266-4273 (2010-08-05)
A new synthetic protocol for the LiAlH(4)-promoted reduction of non-activated aziridines under microwave conditions was developed. Thus, ring opening of 2-(acetoxymethyl)aziridines provided the corresponding beta-amino alcohols, which were then used as eligible substrates in the synthesis of 5-methylmorpholin-2-ones via condensation
Seiji Takeda et al.
Journal of biomedical nanotechnology, 9(2), 303-306 (2013-05-01)
Measurement of oxidized low-density lipoprotein (LDL) generated by oxidative stress of various kinds might be useful for evaluating the risk of cardiovascular disease. We evaluated some electrode materials to detect oxidized LDL electrochemically. Some carbon nanotube dispersions were studied as
Sasol Encyclopaedia of Science and Technology null
Matthias D'hooghe et al.
Organic & biomolecular chemistry, 8(3), 607-615 (2010-01-22)
trans- and cis-1-Alkyl-4-aryl-3-chloroazetidin-2-ones, prepared through cyclocondensation of chloroketene and the appropriate imines in a diastereoselective way, were transformed into the corresponding non-activated trans- and cis-2-aryl-3-(hydroxymethyl)aziridines via reductive ring contraction using LiAlH(4) in Et(2)O. Furthermore, trans-2-aryl-3-(hydroxymethyl)aziridines were transformed into 2-amino-3-arylpropan-1-ols and
Meganne Christian et al.
Nanoscale, 2(12), 2587-2590 (2010-10-05)
Nanoparticles of NaAlH4, LiAlH4 and LiBH4 were prepared by encapsulating their respective hydrides within carbon nanotubes by a wet chemical approach. The resulting confinement had a profound effect on the overall hydrogen storage properties of these hydrides, with NaAlH4 and
Takahisa Nakane et al.
Chemical & pharmaceutical bulletin, 50(9), 1273-1275 (2002-09-19)
Two new migrated hopane triterpenoids, viz. 4alpha-hydroxyfilican-3-one and fern-9(11)-en-12beta-ol, and olean-18-en-3-one and olean-12-en-3-one as the first example of oleanane compounds from Adiantum ferns were isolated along with many other known triterpenoids from Adiantum capillus-veneris of China and Egypt. Their structures
Shinya Tachibana et al.
Journal of oleo science, 57(2), 107-113 (2008-01-17)
The synthesis and physiological activity of thiophenes and furans with methoxyacetophenone derivatives were examined. 3-Methoxyacetophenone (1) and 4-methoxyacetophenone (2) were converted, respectively, to the oximes (3) and (4) by oximation with hydroxylamine hydrochloride, and to the primary amines (5) and
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