نتایج جستجو برای: diethyl2 14c malonate
تعداد نتایج: 11269 فیلتر نتایج به سال:
Isoxazolino[4,5:1,2][60]- and -[70]fullerenes undergo an efficient retro-cycloaddition reaction to pristine fullerene by thermal treatment in the presence of an excess of a dienophile and Cu(II) catalysis, which can be selectively used in the presence of malonate or pyrrolidine cycloadducts. Trapping experiments using N-phenylmaleimide as dipolarophile have shown that the reaction mechanism occ...
In the crystal structure of the title compound, C(8)H(12)N(+)·C(3)H(3)O(4) (-), the hydrogen malonate anions are linked into infinite chains parallel to the b axis by inter-molecular O-H⋯O hydrogen bonds of the type COO(-)⋯HO(2)C in a head-to-tail fashion. The 4-ethyl-anilinium cations link adjacent anion chains by inter-molecular N-H⋯O hydrogen bonds into a two-dimensional network parallel to ...
The synthesis of a new chiral pyrrolidine has been performed using 2,3-O-isopropylidene-D-erythronolactol as a suitable starting material.
Two novel carbohydrate-derived pyridyl (PYOX)- and cyclopropyl (CYBOX)-substituted oxazoline ligands were prepared from d-glucosamine hydrochloride and 1,3,4,6-tetra-O-acetyl-2-amino-2-deoxy-β-d-glucopyranose hydrochloride in two steps, respectively. The sugar-annulated PYOX ligand formed a stable metal complex with Pd(II), which was fully characterized by NMR spectroscopy and X-ray crystallogr...
Regioselective nucleophilic addition of bisnucleophiles 1,2-benzenediamine, 2-amino-benzenethiol, and N-phenyl-1,2-benzenediamine to 1,3-diphenylbenzo[e][1,2,4]triazin-7(1H)-one (1) at C6 followed by intramolecular cyclocondensation at the C7 carbonyl afforded highly coloured tetracenes 1,3-diphenyl-1,6-dihydro-[1,2,4]triazino[5,6-b]phenazin-4-ium 4-methylbenzenesulfonate (12), 1,3-diphenyl-1H-...
Bioinspired Early Divergent Oxidative Cyclizations toward Pleiocarpamine, Talbotine, and Strictamine
Toward the mavacurane and akuammilane monoterpene indole alkaloids, we developed divergent oxidative couplings between nucleus (at N1 or C7) C16-malonate of a common tricyclic model related to strictosidine according biosynthetic hypothesis postulated by Hesse Schmid. These cyclizations led selectively formation N1–C16 bond pleiocarpamine C7–C16 strictamine. We were then able obtain scaffold ta...
To examine the fate of the carbons of acetate and to evaluate the usefulness of labeled acetate in assessing intrahepatic metabolic processes during gluconeogenesis, [2-14C]acetate, [2-14C]ethanol, and [1-14C]ethanol were infused into normal subjects fasted 60 h and given phenyl acetate. Distributions of 14C in the carbons of blood glucose and glutamate from urinary phenylacetylglutamine were d...
The yield of oxidative phosphorylation in isolated tomato fruit mitochondria depleted of free fatty acids remains constant when respiratory rates are decreased by a factor of 3 by the addition of n-butyl malonate. This constancy makes the determination of the contribution of the linoleic acid-induced energy-dissipating pathway by the ADP/O method possible. No decrease in membrane potential is o...
Because carbonyl groups are ubiquitous in organic chemistry, the ability to synthesize functionalized carbonyl compounds, particularly enantioselectively, is an important objective. We have developed a straightforward and versatile method for catalytic asymmetric carbon–carbon bond formation at the γ-position of carbonyl compounds, specifically, phosphine-catalyzed additions of malonate esters ...
1. Caspases, key enzymes in the apoptosis pathway, have been detected in the brain of HD patients and in animal models of the disease. In the present study, we investigated the neuroprotective properties of a new, reversible, caspase-3-specific inhibitor, M826 (3-([(2S)-2-[5-tert-butyl-3-[[(4-methyl-1,2,5-oxadiazol-3-yl)methyl]amino]-2-oxopyrazin-1(2H)-yl]butanoyl]amino)-5-[hexyl(methyl)amino]-...
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