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关键词:'oxazoles'
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[Humoryl].
D Servant et al.
Soins. Psychiatrie, (63)(63), I-II (1986-01-01)
N V Krishnamurthy et al.
Journal of fluorescence, 18(1), 29-34 (2007-09-05)
The quenching of 2,5-diphenyloxazole (PPO) fluorescence by nucleotides has been investigated by electronic absorption and steady state fluorescence spectra. Five purine nucleotides AMP, ADP, ATP, GMP and dGMP, one pyrimidine nucleotide UMP and one dinucleotide NAD have been employed in
Julien Pytkowicz et al.
Organic & biomolecular chemistry, 8(20), 4540-4542 (2010-09-08)
Two efficient routes are reported for the synthesis of both enantiomers of trifluoroalaninol in enantiopure form. The first pathway involves a Strecker-type reaction performed from a chiral trifluoromethyloxazolidine (Fox). The second route, which is more direct, involves, as a key
J R Lakowicz et al.
Photochemistry and photobiology, 50(4), 541-546 (1989-10-01)
We describe a novel application of frequency-domain fluorometry which allows resolution of the decay times and emission spectra of samples which display multi-exponential decay kinetics. This method does not require any previous knowledge about the decay times or any assumptions
T Miyazawa et al.
International journal of peptide and protein research, 40(1), 49-53 (1992-07-01)
In segment couplings by the mixed anhydride method using isobutyloxycarbonyl chloride, the use of copper(II) chloride as an additive suppressed racemization completely in the same manner as in the carbodiimide method reported previously. This was confirmed by employing a number
Jing Lin et al.
Journal of agricultural and food chemistry, 56(17), 8226-8230 (2008-08-08)
The photodegradation pathway of the commonly used herbicide fenoxaprop-p-ethyl (FE) was elucidated, and the effects of the photodegradation on its toxicity evolution were investigated. Under solar irradiation, FE could undergo photodegradation, and acetone enhanced the photolysis rates significantly. The same
Anna V Gudmundsdottir et al.
Organic letters, 10(16), 3461-3463 (2008-07-12)
N'-Glycopyranosylsulfonohydrazides are introduced as glycosyl donors for protecting group free synthesis of O-glycosides, glycosyl azides, and oxazolines. Mono- and disaccharides containing a reducing terminal N-acetylglucosamine residue were condensed with p-toluenesulfonylhydrazide to give the desired beta- d-pyranose donors. These donors can
Naoko Okai et al.
Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine, 33(4-5), 187-200 (2020-07-19)
Vibrio vulnificus, a pathogenic bacterium that causes serious infections in humans, requires iron for growth. Clinical isolate, V. vulnificus M2799, secretes a catecholate siderophore, namely, vulnibactin, to capture iron (III) from the environment. Growth experiments using a deletion mutant indicated
Yu Qian et al.
The Journal of organic chemistry, 75(21), 7483-7486 (2010-10-14)
A new approach to synthesize optically active β-amino-α-hydroxyl acid derivatives via chiral Brønsted acid-Rh(2)(OAc)(4) cocatalyzed three-component reactions of diazo acetates with alcohols and imines is reported. A matched reaction system was identified to give the products in moderate diastereoselectivity and
D Clemett et al.
Drugs, 59(4), 815-827 (2000-05-10)
Linezolid is an oxazolidinone antibacterial agent that acts by inhibiting the initiation of bacterial protein synthesis. Cross-resistance between linezolid and other inhibitors of protein synthesis has not been demonstrated. Linezolid has a wide spectrum of activity against gram-positive organisms including
Montasser Hijazi et al.
Chembiochem : a European journal of chemical biology, 21(6), 874-882 (2019-10-16)
Poly(2-oxazoline)s (POxs) with 2,2'-iminodiacetate (IDA) end groups were investigated as inhibitors for laccase. The polymers with the IDA end groups are reversible, competitive inhibitors for this enzyme. The IC50 values were found to be in a range of 1-3 mm. Compared
Arthur Y Shaw et al.
The Journal of pharmacology and experimental therapeutics, 331(2), 636-647 (2009-08-07)
A series of diaryl- and fluorenone-based analogs of the lead compound UA-62784 [4-(5-(4-methoxyphenyl)oxazol-2-yl)-9H-fluoren-9-one] was synthesized with the intention of improving upon the selective cytotoxicity of UA-62784 against human pancreatic cancer cell lines with a deletion of the tumor suppressor gene
Amany Hamza et al.
TheScientificWorldJournal, 2012, 893204-893204 (2012-06-06)
Identification and mechanism of Echinochloa crus-galli (L.) resistance to fenoxaprop-p-ethyl via physiological and anatomical differences between susceptible and resistant were investigated. The physiological and anatomical differences that were take into account were growth reduction, chlorophyll content reduction, lamina thickness, and
Analytical studies on isoxazoles. II A new fluorimetric determination of 5-phenyl-3-isoxazolecarboxylic acid and its application to the determination of perisoxal in plasma.
T Umeda et al.
Chemical & pharmaceutical bulletin, 28(12), 3507-3513 (1980-12-01)
H S van Walraven et al.
FEBS letters, 184(1), 96-99 (1985-05-06)
Carotenoids present in lipids extracted from the cyanobacterium Synechococcus 6716 indicate trans-membrane potential in proteoliposomes reconstituted from these lipids and the ATPase complex isolated from the same organism. A carotenoid absorbance band shift to a longer wavelength is obtained with
John C L Erve
Current drug metabolism, 9(2), 175-188 (2008-02-22)
Metabolism of xenobiotics can sometimes generate cyclic metabolites. Such metabolites are usually the result of intramolecular reactions occurring within a primary or secondary metabolite and this chemistry may lead to unexpected structures. Intramolecular chemistry is often driven by nucleophilic groups
SimplePHOX, a readily available chiral ligand system for iridium-catalyzed asymmetric hydrogenation.
Sebastian P Smidt et al.
Organic letters, 6(12), 2023-2026 (2004-06-05)
[reaction: see text] New Ir-SimplePHOX complexes Ir-6-Ir-9 catalyze the quantitative, highly enantioselective hydrogenation of a range of unfunctionalized and functionalized olefins. Synthesis, catalytic results, and X-ray crystal structures are presented here.
Grant A Boyle et al.
Magnetic resonance in chemistry : MRC, 46(12), 1089-1095 (2008-10-17)
The NMR elucidation of a novel ligand (S)-pentacyclo-undecane bis-(4-phenyloxazoline) and related pentacyclo-undecane (PCU) derivatives is reported. Two-dimensional NMR proved to be a powerful technique in overcoming the difficulties associated with the elucidation of these compounds when only one-dimensional NMR data
Reaction of 2-chlorobenzoxazole with anthranilic acids and 2-amino-1-naphthalenesulfonic acid.
J Sam et al.
Journal of pharmaceutical sciences, 57(8), 1445-1446 (1968-08-01)
Yngve Guttormsen et al.
Molecules (Basel, Switzerland), 25(20) (2020-10-25)
Phorbazoles are polychlorinated heterocyclic secondary metabolites isolated from a marine sponge and several of these natural products have shown inhibitory activity against cancer cells. In this work, a synthesis of the trichlorinated phorbazole B using late stage electrophilic chlorination was
An-ping Zhang et al.
Guang pu xue yu guang pu fen xi = Guang pu, 26(12), 2298-2301 (2007-03-17)
The supramolecular complexes of fenoxaprop-p-ethyl and various cyclodextrins (beta-CD, HP-beta-CD, RAMEB) were studied by UV spectra technique. The results showed that all cyclodextrins could form 1:1 inclusion complexes with fenoxaprop-p-ethyl in ethanol-water (the volume ratio of ethanol to water was
B M Kopriwa
Histochemistry, 68(3), 265-279 (1980-01-01)
Several reports have indicated that scintillators enhance the intensity of radioautographic reactions. If this were the case, the use of scintillators would shorten the exposure time of radioautographs and the production of radioautographs would be accelerated. It was, therefore, decided
Akira Sakakura et al.
Chemical communications (Cambridge, England), (30)(30), 3561-3563 (2008-07-26)
Efficient total syntheses of fluvibactin and vibriobactin have been achieved via molybdenum(VI) oxide-catalyzed dehydrative cyclization, Sb(OEt)(3)-catalyzed ester-amide transformation, and WSCI and HOAt-promoted dehydrative amide formation.
S Keating-Nakamoto et al.
Analytical biochemistry, 148(2), 349-356 (1985-08-01)
We describe a new method for the analysis of phase-sensitive fluorescence emission spectra. This method permits the resolution of three-component mixtures using spectra measured at a single modulation frequency. Phase-sensitive spectra are recorded using one modulation frequency, at a number
P A van Zwieten
Journal of hypertension, 15(2), 117-125 (1997-02-01)
Clonidine, guanfacine, guanabenz and alpha-methyl-dioxyphenylalanine (DOPA), the prototypes of centrally acting antihypertensives, are assumed to induce peripheral sympathoinhibition and a reduction in blood pressure via the stimulation of alpha2-adrenoceptors in the brain stem. More recently, central imidazoline (I1)-receptors have been
Luo Mei et al.
Journal of combinatorial chemistry, 11(2), 220-227 (2009-01-14)
A class of modular oxazolines and their derivatives 1-5 were synthesized with moderate to excellent yields using a simple one-pot method; 4 x 3 bis-oxazolines were obtained, as expected, from each of the three reactions of 1,4-dicyanobenzene, 1,3-dicyanobenzene, and 1,2-dicyanobenzene
Amanda F Ward et al.
Organic letters, 13(17), 4728-4731 (2011-08-05)
The stereoselective synthesis of 2,4- and 2,5-disubstituted 1,3-oxazolidines is accomplished via Pd-catalyzed carboamination of O-vinyl-1,2-amino alcohol derivatives. The transformations generate cis-disubstituted products with good to excellent diastereoselectivity, and enantiomerically enriched substrates are converted without loss of optical purity. In addition
R E Marsh et al.
Acta crystallographica. Section C, Crystal structure communications, 48 ( Pt 9), 1622-1624 (1992-09-15)
(4S)-4-Benzyl-3-[(4S,5S)-(1-methoxy-5-methylcyclohexen-4- yl)carbonyl]-2-oxazolidinone, C19H23NO4, M(r) = 329.40, monoclinic, P2(1), a = 11.453 (3), b = 7.163 (4), c = 11.929 (2) A, beta = 111.86 (2) degree, V = 908.3 (5) A3, Z = 2, D chi = 1.20 g cm-3
(4S,5S)-4-methyl-5-phenyl-1,3-oxazolidin-2-one.
P D Robinson et al.
Acta crystallographica. Section C, Crystal structure communications, 49 ( Pt 6), 1238-1240 (1993-06-15)
T R Herrin et al.
Journal of medicinal chemistry, 18(12), 1216-1223 (1975-12-01)
The preparation and activity against Plasmodium berghei of derivatives of 1-(4-methoxycinnamoyl)-4-(5-phenyl-4-oxo-2-oxazolin-2-yl)piperazine are described. Replacement of the cinnamoyl group was accomplished by acylation or alkylation of 1-(5-phenyl-4-oxo-2-oxazolin-2-yl)piperazine. Modifications of the 5-phenyl group were prepared either by a sequence of reactions involving
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