Month: December 2022

White, James D. published the artcileTotal Synthesis of Phorboxazole A. 1. Preparation of Four Subunits, Category: ethers-buliding-blocks, the publication is Organic Letters (2006), 8(26), 6039-6042, database is CAplus and MEDLINE.

Four subunits (I–IV) of the potent antitumor agent phorboxazole A were constructed. Fragments C20-C32 (I) and C9-C19 (II) containing tetrahydropyrans A and B, resp., were assembled using palladium-catalyzed intramol. alkoxycarbonylation.

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 C14H18BClO4, Category: ethers-buliding-blocks.

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

Rahman, Shafikur Md. published the artcileDiscovery of First-in-Class Peptidomimetic Neurolysin Activators Possessing Enhanced Brain Penetration and Stability, Synthetic Route of 6850-57-3, the publication is Journal of Medicinal Chemistry (2021), 64(17), 12705-12722, database is CAplus and MEDLINE.

Peptidase neurolysin (Nln) is an enzyme that functions to cleave various neuropeptides. Upregulation of Nln after stroke has identified the enzyme as a critical endogenous cerebroprotective mechanism and validated target for the treatment of ischemic stroke. Overexpression of Nln in a mouse model of stroke results in dramatic improvement of stroke outcomes, while pharmacol. inhibition aggravates them. Activation of Nln has therefore emerged as an intriguing target for drug discovery efforts for ischemic stroke. Herein, we report the discovery and hit-to-lead optimization of first-in-class Nln activators based on histidine-containing dipeptide hits identified from a virtual screen. Adopting a peptidomimetic approach provided lead compounds that retain the pharmacophoric histidine moiety and possess single-digit micromolar potency over 40-fold greater than the hit scaffolds. These compounds exhibit 5-fold increased brain penetration, significant selectivity over highly homologous peptidases, greater than 65-fold increase in mouse brain stability, and ‘drug-like’ fraction unbound in the brain.

Journal of Medicinal Chemistry published new progress about 6850-57-3. 6850-57-3 belongs to ethers-buliding-blocks, auxiliary class Amine,Benzene,Ether, name is (2-Methoxyphenyl)methanamine, and the molecular formula is C8H11NO, Synthetic Route of 6850-57-3.

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

Shankar, Jaya Seeli published the artcileMechanism of photoinduced charge transfer at MEH-PPV and titanium dioxide nanoparticle interface, Application of 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, the publication is Indian Journal of Chemistry, Section A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical Chemistry (2020), 59A(9Spec.Iss.), 1278-1284, database is CAplus.

In this study, we investigated mechanisms of photoinduced electron transfer from a conjugated polymer poly(2-methoxy-5-(2-ethylhexyloxy)1,4-phenylenevinylene) (MEH-PPV) to titanium dioxide (TiO₂) nanoparticles (acceptor) through steady-state photoluminescence (PL) spectroscopy. Since mixed phase TiO₂ has better photocatalytic compared to single phase, it is an efficient charge separation process during photoexcitation of polymer nanocomposites by incorporating the mixed phase TiO₂ nanoparticles into the MEH-PPV polymer matrix through in situ polymerization Structural characterization revealed only phys. interaction between the polymer matrix and dispersed nanoparticles. The absorbance spectra of nanocomposites also indicated the absence of ground state complex formation. Luminescence quenching of polymer nanocomposites compared to pristine MEH-PVV signifies the charge transfer taking place at the MEH-PPV/TiO₂ interfaces. Thus, the MEH-PPV/ mixed phase TiO₂ nanocomposite serves as an active layer for photovoltaic application.

Indian Journal of Chemistry, Section A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical Chemistry published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C6H12F3NO5S, Application of 1-((2-Ethylhexyl)oxy)-4-methoxybenzene.

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

Haerianardakani, Sepehr published the artcilePhenylalanine mutation to cyclohexylalanine facilitates triangular trimer formation by β-hairpins derived from Aβ, SDS of cas: 77128-73-5, the publication is Journal of the American Chemical Society (2020), 142(49), 20708-20716, database is CAplus and MEDLINE.

Oligomers of the β-amyloid peptide, Aβ, play a central role in the pathogenesis and progression of Alzheimer’s disease. Trimers and higher-order oligomers composed of trimers are thought to be the most neurotoxic Aβ oligomers. To gain insights into the structure and assembly of Aβ oligomers, our laboratory has previously designed and synthesized macrocyclic peptides derived from Aβ_17-23 and Aβ_30-36 that fold to form β-hairpins and assemble to form trimers. In this study, we found that mutating Phe₂₀ to cyclohexylalanine (Cha) in macrocyclic Aβ-derived peptides promotes crystallization of an Aβ-derived peptide containing the Aβ_24-29 loop (peptide 3_F20Cha) and permits elucidation of its structure and assembly by X-ray crystallog. X-ray crystallog. shows that peptide 3_F20Cha forms a hexamer. X-ray crystallog. and SDS-PAGE further show that trimer 4_F20Cha, a covalently stabilized trimer derived from peptide 3_F20Cha, forms a dodecamer. Size exclusion chromatog. shows that trimer 4_F20Cha forms higher-order assemblies in solution Trimer 4_F20Cha exhibits cytotoxicity against the neuroblastoma cell line SH-SY5Y. These studies demonstrate the use of the F20Cha mutation to further stabilize oligomers of Aβ-derived peptides that contain more of the native sequence and thus better mimic the oligomers formed by full-length Aβ.

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, SDS of cas: 77128-73-5.

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

Li, Liantao published the artcileSynthesis and pharmacological activity of fluorescent histamine H₁ receptor antagonists related to mepyramine, Name: N-(4-Methoxybenzyl)pyridin-2-amine, the publication is Bioorganic & Medicinal Chemistry Letters (2003), 13(7), 1245-1248, database is CAplus and MEDLINE.

Fluorescently labeled histamine H₁ receptor antagonists were synthesized starting from N-demethylmepyramine by introduction of ω-aminoalkyl chains (2-8 methylene groups in length) followed by derivatization of the terminal NH₂ group with various fluorophores (fluorescein, naphthofluorescein, rhodamine, tetramethylrhodamine, BODIPY, dansyl, and nitrobenzoxadiazole (NBD)). On the isolated guinea pig ileum and in a Ca²⁺ assay on U373MG human glioblastoma cells the highest H₁ antagonistic activities were found in 5- and 6-carboxyfluorescein labeled compounds with hexa- and octamethylene spacers and in an analogous NBD-aminohexanoyl derivative (pA₂ or pK_B values in the range: 8.3-9.0; compared to 9.3-9.4 for mepyramine).

Bioorganic & Medicinal Chemistry Letters published new progress about 52818-63-0. 52818-63-0 belongs to ethers-buliding-blocks, auxiliary class Pyridine,Amine,Benzene,Ether, name is N-(4-Methoxybenzyl)pyridin-2-amine, and the molecular formula is C13H14N2O, Name: N-(4-Methoxybenzyl)pyridin-2-amine.

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

Gilmartin, Philip H. published the artcileVanadium-Catalyzed Oxidative Intramolecular Coupling of Tethered Phenols: Formation of Phenol-Dienone Products, HPLC of Formula: 2944-47-0, the publication is Organic Letters (2020), 22(8), 2914-2919, database is CAplus and MEDLINE.

A mild and efficient method for the vanadium-catalyzed intramol. coupling of tethered free phenols is described. The corresponding phenol-dienone products are prepared directly in good yields with low catalyst loadings. Electronically diverse tethered phenol precursors are well tolerated, and the catalytic method was effectively applied as the key step in syntheses of three natural products and a synthetically useful morphinan alkaloid precursor.

Organic Letters published new progress about 2944-47-0. 2944-47-0 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 2-Isopropylanisole, and the molecular formula is C10H14O, HPLC of Formula: 2944-47-0.

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

Ikeda, Koichi published the artcileSynthesis of polyazomethine having naphthalene structure in the main chain, Recommanded Product: 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, the publication is Kobunshi Ronbunshu (2009), 66(6), 234-237, database is CAplus.

We have synthesized aldehyde compounds with branched methylene groups by a LiCl catalyst. The number-average mol. weight and the weight-average mol. weight of the polymer, determined by MS, were 6.5 × 10³ and 6.5 × 10³, resp. The synthesized polymer showed a photoluminescence peak at 447 nm. However, the fluorescent strength did not show enough fluorescence. The TGA measurements of the polymer, showed that the polymer had a high thermal stability with a 10% thermal weight loss initiation temperature of 390°.

Kobunshi Ronbunshu published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Recommanded Product: 1-((2-Ethylhexyl)oxy)-4-methoxybenzene.

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

Karisalmi, Kaisa published the artcileStereoselective synthesis of the C₉-C₁₉ lactone-dipropionate fragment of calyculin C, Computed Properties of 99438-28-5, the publication is Tetrahedron Letters (2004), 45(44), 8245-8248, database is CAplus.

A highly diastereoselective synthesis of the title fragment (I) of calyculin C has been developed based on an internal asym. induction between a chiral aldehyde and Z-crotyl trifluorosilane.

Tetrahedron 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, Computed Properties of 99438-28-5.

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

Habrant, Damien published the artcileTowards the total synthesis of calyculin C: preparation of the C₉-C₂₅ spiroketal-dipropionate unit, Computed Properties of 99438-28-5, the publication is Organic & Biomolecular Chemistry (2010), 8(19), 4364-4373, database is CAplus and MEDLINE.

An asym. synthesis of the C₉-C₂₅ spiroketal fragment of calyculin C is described. Key steps include two crotylation reactions using successively Brown’s reagent and (Z)-crotyltrifluorosilane for the formation of the anti, anti, anti stereo-tetrad, ynone formation by a Pd-catalyzed coupling of a thiol ester with a terminal alkyne and a double intramol. hetero-Michael addition for the stereoselective construction of the spiroketal framework.

Organic & Biomolecular Chemistry 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, Computed Properties of 99438-28-5.

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

Kertalli, E. published the artcileDirect synthesis of propylene oxide in a packed bed membrane reactor, Recommanded Product: 2-Methoxypropan-1-ol, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2017), 9-14, database is CAplus.

In the present work, the direct synthesis of propylene oxide (PO) in the liquid phase is successfully performed in a packed bed membrane reactor. We show that this engineering device can be implemented under mild reaction conditions (low temperature and pressure) and outside the explosive regime (low hydrogen concentration), making it appealing for industrial applications. The ceramic membrane allows for a sep. feed of the reactants, therefore addressing the PO selectivity issue related to the propylene hydrogenation. The reaction is operated in a continuous methanol flow fed with propylene inside the tubular membrane; hydrogen and oxygen are fed through the porous material. We observe that the feeding strategy of the reactants has an important effect on key parameters such as PO selectivity and productivity. By separating propylene from hydrogen, the propane formation was reduced with respect to conventional packed bed reactors. Moreover, the addition of small amounts of NaBr to the reaction medium increases the catalytic activity to PO, but also to propane formation. Therefore, this study provides a good starting point in the design of a membrane reactor device for the direct synthesis of PO where the main limitations such as propylene hydrogenation and water formation can be addressed.

Chemical Engineering Journal (Amsterdam, Netherlands) 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 C4H10O2, Recommanded Product: 2-Methoxypropan-1-ol.

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