Category: ethers-buliding-blocks

Stockdale, Tegan P. published the artcileA synthesis-enabled relative configurational assignment of the C31-C46 region of hemicalide, HPLC of Formula: 99438-28-5, the publication is Chemical Communications (Cambridge, United Kingdom) (2022), 58(38), 5729-5732, database is CAplus and MEDLINE.

Herein, through the targeted synthesis of configurationally defined fragments, as well as “encoded” mixtures of diastereomers, the stereochem. elucidation of the C31-C46 region of hemicalide I was achieved. Detailed NMR spectroscopic anal. of candidate fragments and comparison with the related hemicalide data strongly supported a 31,32-syn, 32,36-anti and 42,46-anti relationship. In combination with previous work on hemicalide, this reduced the number of possible structural permutations down to a more manageable eight diastereomers.

Chemical Communications (Cambridge, United Kingdom) published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C15H12O6, HPLC of Formula: 99438-28-5.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Ivancev-Tumbas, Ivana published the artcileAdsorption of organic pollutants from the aqueous phase using graphite as a model adsorbent, Formula: C11H10O, the publication is Adsorption Science & Technology (2020), 38(7-8), 286-303, database is CAplus.

Although graphite is not effective as an adsorbent in water treatment, it provides a homogenous, non-porous, carbonaceous structure that is ideal for studying fundamental adsorption mechanisms. High-purity graphite powder (C content 99.5%) was oxidized in an ozone stream, producing a near-surface oxygen content of 5.9 at.%, and was used together with the virgin material to establish adsorption isotherms for organic compounds in aqueous solutions We examined how the aromaticity and substituents of the adsorptives affect adsorption on the model-activated carbon surface. For both virgin and oxidized graphite, the adsorption capacity for the aromatic compounds decreased in the order 1-naphthol > 2-methoxynaphthalene > naphthalene > anisole > phenol, with significant differences in the adsorption capacities of the two graphite species observed only for anisole, naphthalene, and 1-naphthol. The Freundlich constantsfor the five compounds on virgin graphite were 23.9, 10.3, 5.5, 1.4, and 0.8 (nmol mg^-1 )/(μmol L^-1)n, resp. Naphthalene and 1-naphthol were slightly more adsorbed on the virgin material, whereas oxidized graphite had marginally better adsorption properties for anisole. The results underline the importance of dispersive and Π-Π interactions in the adsorption of organic compounds on carbonaceous adsorbents; a second aromatic ring in 1-naphthol and 2-methoxynaphthalene greatly increased the adsorption capacity for these compounds compared with their one-ring counterparts phenol and anisole. Differences were also observed in the adsorption of compounds containing hydroxyl or methoxy substituents, which have electron-donating properties (a resonance effect) but different electron-withdrawal characteristics (caused by induction). Two amino acids occurring as zwitterions, L-tryptophan and L-tyrosine, were also tested as adsorptives. L-Tryptophan, which has a larger aromatic system, achieved higher loading on graphite, suggesting an adsorption mechanism primarily governed by dispersive and Π-Π interactions for these two ionic compounds as well.

Adsorption Science & Technology published new progress about 93-04-9. 93-04-9 belongs to ethers-buliding-blocks, auxiliary class Naphthalene,Ether, name is 2-Methoxynaphthalene, and the molecular formula is C11H10O, Formula: C11H10O.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Phelan, James P. published the artcileOpen-Air Alkylation Reactions in Photoredox-Catalyzed DNA-Encoded Library Synthesis, Formula: C25H23NO4, the publication is Journal of the American Chemical Society (2019), 141(8), 3723-3732, database is CAplus and MEDLINE.

DNA-encoded library (DEL) technol. is a powerful tool commonly used by the pharmaceutical industry for the identification of compounds with affinity to biomol. targets. Success in this endeavor lies in sampling diverse chem. libraries. However, current DELs tend to be deficient in C(sp³) carbon counts. The authors report unique solutions to the challenge of increasing both the chem. diversity of these libraries and their C(sp³) carbon counts by merging Ni/photoredox dual catalytic C(sp²)-C(sp³) cross-coupling as well as photoredox-catalyzed radical/polar crossover alkylation protocols with DELs. The successful integration of multiple classes of radical sources enables the rapid incorporation of a diverse set of alkyl fragments.

Journal of the American Chemical Society published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, Formula: C25H23NO4.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Helberger, Johann Heinrich published the artcileOrganic sulfonic acids. V. Syntheses of 1,4-butanesultone, Related Products of ethers-buliding-blocks, the publication is Justus Liebigs Annalen der Chemie (1954), 158-64, database is CAplus.

To 216 g. O.CH₂.CH₂.CH₂.CH₂ and 1.5 Zn dust was added slowly 237 g. AcCl; the mixture warmed initially at 40°, later at 60°, allowed to stand overnight, and heated 4 hrs. at 100°, giving 330 g. AcO(CH₂)₃CH₂Cl, b₁₅ 85°, 300 g. of which, refluxed 28 hrs. under N with 262 g. Na₂SO₃ in 1 l. H₂O, followed by concentration in vacuo, addition of 0.51. concentrated HCl, saturation with HCl gas, addition of MeOH, filtration, and concentration gave 280 g. HOCH₂(CH₂)₃SO₃H. Heating this acid 1.5 hrs. at 120-30°/16 mm., distilling, and removing dissolved SO₂ by N yielded 221 g. CH₂.(CH₂)₃.SO₂.O (I), b₁₃ 149-50°, large plates, m. 14.5°, nearly insoluble in cold. H₂O and CCl₄ soluble in Et₂O, CHCl₃, C₆H₆, and EtOH, hydrolyzed quantitatively to the sulfonic acid by boiling 1.5 hrs. with H₂O. [Cl(CH₂)₄]₂O (198 g.) heated and stirred under N 58 hrs. with 264 g. Na₂SO₃ in 1 l. H₂O, filtered, treated with BaCl₂, refiltered, and evaporated to dryness in vacuo gave [NaO₃SCH₂(CH₂)₃]₂O, which with saturated HCl and MeOH gave 92.3% of the corresponding free acid (II), uncrystallizable sirup. The Na salt of II, with PCl₅ and CCl₄ gave 78% acid chloride, oil, which, in Et₂O at -50° with liquid NH₃, formed [H₂NO₂S(CH₂)₄]₂O, needles, m. 104.5° (from H₂O). II (76 g.), heated 10 hrs. at 120-5°/6 mm., gave 66.8 g. I, b₅ 135-6°. As in previous publications, I gave the following hygroscopic sulfobetaines in excellent yields: (from pyridine) C₉H₁₃O₃NS, m. 249-50° (decomposition); (from PhNMe₂) C₁₂H₁₉O₃NS, m. 272-3° (decomposition); (from PhNH₂, noncrystalline glass. EtOH (15 cc.) saturated with NH₃ at 0° and heated with 1.36 g. I at 60-5° gave 1.45 g. H₂N(CH₂)₄SO₃H, m. 222-3° (decomposition) (from MeOH). The following crystalline adducts of I were also formed in 92-96% yields, by heating I with the appropriate salts or phenolates in suitable solvents: NC(CH₂)₄SO₃K, SN C(CH₂)₄SO₃K, I(CH₂)₄SO₃K, PhOCH₂(CH₂)₃SO₂Na, PhSCH₂(CH₂)₃SO₃Na, and (from K phthalimide). o-C₆H₄(CO)₂N(CH₂)₄SO₃K.

Justus Liebigs Annalen der Chemie published new progress about 183278-30-0. 183278-30-0 belongs to ethers-buliding-blocks, auxiliary class Salt,Aliphatic hydrocarbon chain,Ether, name is Sodium 4,4′-oxybis(butane-1-sulfonate), and the molecular formula is C8H16Na2O7S2, Related Products of ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

D’Alfonso, Claudio published the artcileComparing the catalytic efficiency of ring substituted 1-hydroxybenzotriazoles as laccase mediators, Formula: C16H18O4, the publication is Tetrahedron (2014), 70(18), 3049-3055, database is CAplus.

A series of ring substituted 1-hydroxybenzotriazoles (6-X-HBTs) have been tested as mediators in the laccase-promoted oxidation of 4-methoxybenzyl alc., 3,4-dimethoxybenzyl alc., and the dimeric lignin model 1-(3,4-dimethoxyphenyl)-2-phenoxyethanol. The effect of the aryl substituents on the yields of oxidation products is remarkable. The catalytic mediation efficiency increases as the electron releasing (ER) properties of the substituent increases up to a maximum value for 6-CH₃-HBT, which resulted a very efficient mediator. Both the oxidation of the 6-X-HBTs to the N-oxyl radicals (6-X-BTNO) by laccase and the hydrogen atom transfer (HAT) process from the benzylic C-H to the 6-X-BTNO contribute to the overall reactivity. The former process is favored by ER substituents that lower the mediator redox potentials. On the other hand, ER substituents decrease the 6-X-BTNO reactivity in the HAT process due to a decrease in the NO-H BDE value, as assessed in this study through a radical equilibration technique.

Tetrahedron published new progress about 183303-74-4. 183303-74-4 belongs to ethers-buliding-blocks, auxiliary class Benzene,Alcohol,Ether, name is 1-(3,4-Dimethoxyphenyl)-2-phenoxyethanol, and the molecular formula is C16H18O4, Formula: C16H18O4.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Hammarlund, E. R. published the artcileMethods of preparing isotonic solutions by means of graphs or tables on the basis of experimentally found iso-osmotic values, Recommanded Product: 4-(3-(4-Butoxyphenoxy)propyl)morpholine hydrochloride, the publication is Pharmaceutica Acta Helvetiae (1960), 593-607, database is CAplus.

Four graphical and three tabular methods for preparing isotonic aqueous solutions are described. New exptl. data is presented for 353 compounds to be used for the recommended and most practical of the methods studied for isotonicity adjustment. All the methods described may be used in practical pharmacy. The graphical methods are more accurate but consume more space than the tabular methods.

Pharmaceutica Acta Helvetiae published new progress about 637-58-1. 637-58-1 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is 4-(3-(4-Butoxyphenoxy)propyl)morpholine hydrochloride, and the molecular formula is C17H28ClNO3, Recommanded Product: 4-(3-(4-Butoxyphenoxy)propyl)morpholine hydrochloride.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Caldarelli, Marina published the artcileUse of acridinium-based photocatalyst in the Giese-type coupling of arylboronic acids with electron poor olefins, Application In Synthesis of 93-04-9, the publication is Tetrahedron Letters (2022), 153978, database is CAplus.

The development of a visible light-mediated Giese-type reaction using arylboronic acids as aryl radical source was described. The synthetic protocol capitalizes on the employment of environmentally benign metal-free catalyst to forge Csp²-Csp³ bonds. Applications of the methodol. to the synthesis of aminoesters and the anti-inflammatory drug nabumetone, either in batch or in flow, was also reported.

Tetrahedron Letters published new progress about 93-04-9. 93-04-9 belongs to ethers-buliding-blocks, auxiliary class Naphthalene,Ether, name is 2-Methoxynaphthalene, and the molecular formula is C11H10O, Application In Synthesis of 93-04-9.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Hall, Sara M. published the artcileDiscovery of Stable Non-opioid Dynorphin A Analogues Interacting at the Bradykinin Receptors for the Treatment of Neuropathic Pain, Product Details of C25H23NO4, the publication is ACS Chemical Neuroscience (2016), 7(12), 1746-1752, database is CAplus and MEDLINE.

Dynorphin A (Dyn A) is a unique endogenous ligand that possesses well-known neuroinhibitory effects via opioid receptors with a preference for the kappa receptor but also neuroexcitatory effects, which cause hyperalgesia. We have shown that the neuroexcitatory effects are mediated through bradykinin (BK) receptors and that intrathecal (i.th.) administration of our lead ligand 1, [des-Arg⁷]-Dyn A-(4-11), which shows good binding affinity (IC₅₀ = 150 nM) at the BK receptors, blocks Dyn A-induced hyperalgesia in naïve animals and reverses thermal and tactile hypersensitivities in a dose-dependent manner in nerve-injured animals. However, 1 has a serious drawback as a potential drug candidate for the treatment of neuropathic pain because of its susceptibility to enzymic degradation In an effort to increase its stability, we modified ligand 1 using non-natural amino acids and found that analogs substituted at or near the N-terminus with a D-isomer retain binding at the receptor and provide a large increase in stability. In particular when Leu⁵ was modified, with either the D-isomer or N-methylation, there was a large increase in stability (t_1/2 = 0.7-160 h in rat plasma) observed From these studies, we have developed a very stable Dyn A analog 16, [D-Leu⁵,des-Arg⁷]-Dyn A-(4-11), that binds to BK receptors (IC₅₀ = 130 nM) in the same range as ligand 1 and shows good antihyperalgesic effects in both naïve rats and L₅/L₆ spinal nerve ligation rats.

ACS Chemical Neuroscience published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, Product Details of C25H23NO4.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Mukherjee, Sumit published the artcileApplication of Tandem Ring-Closing Enyne Metathesis: Formal Total Synthesis of (-)-Cochleamycin A, Application of (+)-B-Methoxydiisopinocampheylborane, the publication is Organic Letters (2009), 11(13), 2916-2919, database is CAplus and MEDLINE.

A tandem ring-closing metathesis of a silaketal-based dienyne substrate proceeded efficiently to provide a bicyclic siloxane, which upon removal of the silicon tether afforded an (E,Z)-1,3-dienediol. Further manipulation of this key functional motif rendered synthesis of the entire C1-C19 linear skeleton of (-)-cochleamycin A (I) , a late-stage intermediate employed in the previous total synthesis of (+)-cochleamycin A by Roush and co-workers.

Organic Letters published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C21H37BO, Application of (+)-B-Methoxydiisopinocampheylborane.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Shin, Sang Baek published the artcileThe effects of impregnation of precious metals on the catalytic activity of titanium silicate (TS-1) in epoxidation of propene using hydrogen peroxide, SDS of cas: 1589-47-5, the publication is Journal of Molecular Catalysis A: Chemical (2016), 478-488, database is CAplus.

Propene oxide is an important chem. intermediate and titanium silicalite (TS-1) has been widely investigated as a promising catalyst for the direct epoxidation of propene with ex-situ or in-situ produced hydrogen peroxide as an oxidant. In order to clarify the effects of the kind of precious metal and treatment process in the catalyst preparation on the propene epoxidation and the hydrogen peroxide decomposition, TS-1 was impregnated with gold and palladium via drying, calcination and reduction and the experiments to check its catalytic performance were conducted in a gas aspirating autoclave reactor in the absence of mass transfer limitations. The presence of precious metals vigorously catalyzed the side reactions and hydrogen peroxide decomposition Some of the precious metal containing TS-1 catalysts showed high initial rates but there was no catalyst with a propene oxide yield after 5 h reaction time comparable to TS-1 alone because of the enhancement of side reactions by precious metals. The significant decline in the selectivity to propene oxide over the dried precious metal containing TS-1 catalysts was attributed to the leaching of precious metals into the reaction medium. Palladium containing TS-1 showed exceptionally high decomposition of hydrogen peroxide. Reduction and calcination increased the decomposition by forming metallic gold and palladium. Homogeneous dispersion of gold nanoparticles was achieved by a sol immobilization method which led to a decrease of propene oxide selectivity and an increase of hydrogen peroxide decomposition

Journal of Molecular Catalysis A: Chemical published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C11H24O3, SDS of cas: 1589-47-5.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem