Month: March 2022

Yuasa, Yoshifumi; Tsuruta, Haruki published the article 《Practical syntheses of (S)-4-hydroxytetrahydrofuran-2-one, (S)-3-hydroxytetrahydrofuran, and their (R)-enantiomers》. Keywords: hydroxytetrahydrofuranone preparation; hydroxytetrahydrofuran preparation; THF hydroxy preparation; furanol preparation; chlorohydroxybutanoate cyclocondensation kinetics.They researched the compound: (R)-Ethyl 4-chloro-3-hydroxybutanoate( cas:90866-33-4 ).HPLC of Formula: 90866-33-4. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:90866-33-4) here.

Optically active 4-hydroxytetrahydrofuran-2-one was synthesized in good yield from ClCH2CHOHCH2CO2Et (I) by refluxing with dilute HCl. In a similar manner, optically active 3-hydroxytetrahydrofuran was prepared from ClCH2CHOH(CH2)2OH, which was derived from I by NaBH4-reduction These cyclizations proceed without racemization.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem

Application of 129-18-0. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Sodium 4-butyl-3,5-dioxo-1,2-diphenylpyrazolidin-4-ide, is researched, Molecular C19H19N2NaO2, CAS is 129-18-0, about Physiological and drug-induced changes in the glycogen content of mouse brain. Author is Hutchins, D. A.; Rogers, Keith James.

The effect of the method of killing on the concentration of glycogen in mouse brain was determined The cerebral glycogen content of mice killed by immersion in liquid N did not differ significantly from that of animals decapitated and the heads immediately frozen. A delay before freezing led to the rapid loss of brain glycogen, with a 17% fall at 10 sec and an 82% loss after 5 min. Hyperglycemia, induced by the administration of D-glucose, resulted in an 8.3% loss of brain glycogen after 120 min. Insulin hypoglycemia produced a 10.7% fall in glycogen at 60 min followed by an 11.2% increase at 120 min. Exposure to either high (32°) or low (10°) ambient temperatures, caused a depletion of brain glycogen. A circadian rhythm of brain glycogen concentration was found, with a nadir which was coincident with the peak of locomotor activity and body temperature Drugs from several pharmacol. classes were studied for their in vivo effect on the concentration of glycogen in mouse brain. Brain glycogen was increased by all the depressant drugs tested, and by some drugs which had little effect on behavior (diphenhydramine, phenytoin and propranolol), or which caused excitation (caffeine and nialamide). Glycogen was depleted only by amphetaminelike compounds or by bemegride-induced convulsions. The results are discussed with particular reference to the possible relation between catechol amines and glycogen metabolism in the brain.

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Benzofuran – Wikipedia,
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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Subunit composition of the untransformed glucocorticoid receptor in the cytosol and in the cell, published in 1992-02-15, which mentions a compound: 70539-42-3, Name is Bis(2,5-dioxopyrrolidin-1-yl) O,O’-ethane-1,2-diyl disuccinate, Molecular C18H20N2O12, Category: benzofurans.

Bifunctional reagents were used to exam. the subunit composition of the non-DNA-binding form of the rat and human glucocorticoid receptor. Treatment of intact cells and cell extracts with a reversible cross-linker, followed by electrophoretic anal. of immunoadsorbed receptor revealed that 3 proteins of apparent approx. mol. masses, 90, 53, and 14 kDa are associated with the receptor. The 1st of these was identified immunochem. as a 90-kDa heat-shock protein (hsp90). The complex isolated from HeLa cells contained 2.2 mol hsp90/mol steroid-binding subunit. Crosslinking of the receptor complex in the cytosol completely prevented salt-induced dissociation of the subunits. The cross-linked receptor was electrophoretically resolved into 2 oligomeric complexes of apparent mol. mass 288 kDa and 347 kDa, reflecting the association of the 53-kDa protein with a fraction of the receptor. Since no higher oligomeric complexes could be generated by crosslinking cell extracts under different conditions, it was concluded that most of the untransformed cytosolic receptor is devoid of addnl. components.

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Benzofuran – Wikipedia,
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Electric Literature of CAgF3O3S. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Silver(I) trifluoromethanesulfonate, is researched, Molecular CAgF3O3S, CAS is 2923-28-6, about Synthesis, crystal structure and photophysical properties of bis[2,6-difluoro-3-(pyridin-2-yl)pyridine-κN](trifluoromethanesulfonato-κO)silver(I). Author is Moon, Suk-Hee; Paek, Sanghyun; Kang, Youngjin.

In the title compound, [Ag(CF3SO3)(C10H6F2N2)2], the AgI center adopts a highly distorted trigonal-planar coordination environment resulting from its coordination by one O atom of the trifluoromethanesulfonate anion and the pyridine N atoms of two crystallog. independent 2′,6′-difluoro-2,3′-bipyridine ligands, which display very similar conformations to one another. Pairwise Ag···O-SO2CF3- [Ag···O = 2.8314 (14) Å] interactions and intermol. C-H···O interactions between inversion-related units lead to the formation of an eight-membered cyclic dimer in which the silver atoms are separated by 6.2152 (3) Å. In the crystal, the dimers are linked through C-H···O hydrogen bonds, halogen···π and weak π-π stacking interactions, resulting in the formation of a three-dimensional supramol. network. The title compound exhibits a strong and broad emission band from 400 nm to 550 nm in solution and its photoluminescence quantum efficiency is estimated to be ca 0.2, indicating that the title compound could have applications as an emitting material in organic light-emitting diodes (OLEDs).

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Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem

Product Details of 90866-33-4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: (R)-Ethyl 4-chloro-3-hydroxybutanoate, is researched, Molecular C6H11ClO3, CAS is 90866-33-4, about Production of (R)-ethyl-4-chloro-3-hydroxybutanoate using Saccharomyces cerevisiae YOL151W reductase immobilized onto magnetic microparticles. Author is Choo, Jin Woo; Kim, Hyung Kwoun.

For the synthesis of various pharmaceuticals, chiral alcs. are useful intermediates. Among them, (R)-ethyl-4-chloro-3-hydroxybutanoate ((R)-ECHB) is an important building block for the synthesis of L-carnitine. (R)-ECHB is produced from ethyl-4-chloro-3-oxobutanoate (ECOB) by a reductase-mediated, enantioselective reduction reaction. The Saccharomyces cerevisiae YOL151W reductase that is expressed in Escherichia coli cells exhibited an enantioselective reduction reaction toward ECOB. By virtue of the C-terminal His-tag, the YOL151W reductase was purified from the cell-free extract using Ni2+-NTA column chromatog. and immobilized onto Ni2+-magnetic microparticles. The phys. properties of the immobilized reductase (Imm-Red) were measured using electron microscopy, a magnetic property measurement system, and a zeta potential system; the average size of the particles was approx. 1 μm and the saturated magnetic value was 31.76 emu/g. A neodymium magnet was used to recover the immobilized enzyme within 2 min. The Imm-Red showed an optimum temperature at 45°C and an optimum pH at 6.0. In addition, Bacillus megaterium glucose dehydrogenase (GDH) was produced in the E. coli cells and was used in the coupling reaction to regenerate the NADPH cofactor. The reduction/oxidation coupling reaction composed of the Imm-Red and GDH converted 20 mM ECOB exclusively into (R)- ECHB with an e.e.p value of 98%.

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Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Effects of long-lasting, high-fat nourishment on the triglycerides, free fatty acids, and phosphatides of blood plasma》. Authors are Canzler, H.; Glatzel, H..The article about the compound:Sodium 4-butyl-3,5-dioxo-1,2-diphenylpyrazolidin-4-idecas:129-18-0,SMILESS:O=C(N(C1=CC=CC=C1)N2C3=CC=CC=C3)[C-](CCCC)C2=O.[Na+]).Recommanded Product: Sodium 4-butyl-3,5-dioxo-1,2-diphenylpyrazolidin-4-ide. Through the article, more information about this compound (cas:129-18-0) is conveyed.

Alterations in the lipid profile of blood plasma on various fat diets were assessed and were less significant with high-fat diets (58% of total cal.), for free and total cholesterol, free fatty acids, and phosphatides than for triglycerides (I) in 2 healthy male volunteers. The I content was lowest when the fat intake was high, and vice versa. The high I content on a fat-poor diet (5% of total cal.) resulted from transport lipemia from tissues to liver, which was unnecessary on a high-fat diet, since the liver received supplies of fatty acids from the intestine.

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Reference:
Benzofuran – Wikipedia,
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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 6-Fluoronicotinonitrile, is researched, Molecular C6H3FN2, CAS is 3939-12-6, about Concise Synthesis of Furo[2,3-b]indolines via [3,3]-Sigmatropic Rearrangement of N-Alkenyloxyindoles, the main research direction is furoindoline preparation; alkenyloxyindole sigmatropic rearrangement.Quality Control of 6-Fluoronicotinonitrile.

A concise new synthetic route to furo[2,3-b]indolines has been developed by taking advantage of the reactivity of N-alkenyloxyindole intermediates. These compounds spontaneously underwent [3,3]-sigmatropic rearrangement followed by cyclization to form hemiaminals as single diastereomers. Tin-promoted N-hydroxyindole formation followed by conjugate addition to activated alkynes provides simple and modular access to a diverse array of N-alkenyloxyindoles and their corresponding furo[2,3-b]indolines. Microscale high-throughput experimentation was used to facilitate investigation of the scope and tolerance of this transformation and related studies on the nucleophilic aromatic substitution and rearrangement of N-hydroxyindoles with halogenated arenes have also been evaluated.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem

Recommanded Product: 90866-33-4. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (R)-Ethyl 4-chloro-3-hydroxybutanoate, is researched, Molecular C6H11ClO3, CAS is 90866-33-4, about Asymmetric synthesis of (+)-negamycin. Author is Davies, Stephen G.; Ichihara, Osamu.

(+)-Negamycin was synthesized employing the highly diastereoselective conjugate addition of lithium (α-methylbenzyl)benzylamide in the key step. The synthesis was completed in 13 steps starting from Et 4-chloroacetoacetate with an overall yield of 24%.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Sodium 4-butyl-3,5-dioxo-1,2-diphenylpyrazolidin-4-ide, is researched, Molecular C19H19N2NaO2, CAS is 129-18-0, about Pharmacokinetics of certain drugs in the domesticated goat.Related Products of 129-18-0.

Kinetic values for the half-life, first order disappearance rate constant, and apparent specific volume of distribution were reported for acidic drugs (salicylate [69-72-7], phenylbutazone [50-33-9], pentobarbital [57-33-0], and sulfanilamide [63-74-1]) and basic drugs (antipyrine [60-80-0], quinine [130-95-0], and tolazoline [59-98-3]) in goats. The protein-binding capacity was determined for each drug, since membrane permeability is influenced by this factor as well as by the drug’s physicochem. characteristics.

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Benzofuran – Wikipedia,
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He, Meixia; Lehn, Jean-Marie published an article about the compound: Silver(I) trifluoromethanesulfonate( cas:2923-28-6,SMILESS:O=S(C(F)(F)F)([O-])=O.[Ag+] ).Recommanded Product: Silver(I) trifluoromethanesulfonate. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:2923-28-6) through the article.

Optimizing C=N bond formation and C/N component exchange has major significance in dynamic covalent chem. (DCC). Imine and hydrazone generation from their aldehyde, amine and hydrazine components showed large accelerations in presence of AgOTf or Zn(OTf)2, up to 104 for the Zn(II)-(p-anisidine)imine complex. Zn(OTf)2 and auxiliary p-anisidine together accelerated 630 times the formation of the Zn(II)-hydrazone complex, revealing a strong synergistic effect, traced to very fast initial formation of the reactive Zn(II)-imine complex presenting a C=N bond metallo-activated towards reaction with the hydrazine component. Reactions involving more entities showed kinetically faster and thermodynamically simpler outputs due to dynamic competition within a mixture of higher complexity. Catalytic amounts of metal salts and auxiliary amine gave similar marked rate accelerations and turnover, indicating true catalysis. The synergistic effect achieved by combining metallo- and organo-catalysis points to a powerful co-catalysis strategy of bond-formation in DCC through interconnected chem. transformations.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem