Tag: M.W=250-300

Tanaka, Kuniyoshi; Sugawa, Toshio; Nakamori, Ritsuo; Sanno, Yasushi; Ando, Yasuo; Imai, Kinichi published the artcile< Nucleic acid antagonists. VI. Synthesis of 1,4,6-triazaindenes (5H-pyrrolo[3,2-d]pyrimidines)>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is ANTIMETABOLITES; CHEMISTRY, PHARMACEUTICAL; EXPERIMENTAL LAB STUDY; HETEROCYCLIC COMPOUNDS; NUCLEIC ACIDS; PYRIMIDINES; PYRROLES.

Derivatives of 1,4,6-triazaindene, an isostere of purine and indole, were prepared by 2 methods. MeC(:NH)NH2.HCl (11.8 g.) treated with 4.2 g. Na in 85 cc. EtOH and the mixture filtered, treated with 23 g. AcCH(NHAc)CO2Et (I), and heated 4 hrs. on the water bath gave 13.5 g. 2,6-dimethyl-4-hydroxy-5-acetamidopyrimidine (II), m. 275-7° (EtOH). H2NC(:NH)NH2.H2CO3 (4.5 g.) and 1.15 g. Na in 20 cc. EtOH heated 0.5 hr., filtered, treated with 9.35 g. I in 20 cc. EtOH, and heated 8 hrs. on the water bath yielded 3.4 g. 2-NH2 analog of II, m. 295-8° (decomposition). H2NCSNH2 (720 mg.) and 0.5 cc. H2O treated with stirring with 700 mg. Me2SO4 and then with 500 mg. NaOH in 1 cc. H2O and 1.87 g. I and the mixture kept overnight and heated 1 hr. on the water bath gave 700 mg. 2-MeS analog of II, m. 248-52° (EtOH and H2O). II (5 g.) added to 1.9 g. Na in 40 cc. EtOH, the EtOH removed under N, and the residue heated 20 min. under N at 320-5° yielded 2.4 g. 5-Me derivative of III, needles, m. 336° (decomposition). 4-Hydroxy-5-acetamido-6-methylpyrimidine (5 g.) and 2.2 g. Na gave similarly 1.5 g. III, m. above 360°. 5-Benzamido-4-hydroxy-2,6-dimethylpyrimidine (IV) (3.4 g.) and 1.1 g. Na gave similarly during 15 min. at 310° 1.8 g. 2-phenyl-5-methyl-7-oxo-6,7-dihydro-1,4,6-triazaindene, crystal powder, m. 325° (decomposition) (EtOH); also obtained in 60% yield when using iso-PrOH instead of EtOH. 2,4-Diethoxy-6-methyl-5-nitropyrimidine (V) (9.1 g.), 6 g. (CO2Et)2, and 1 g. Na in 20 cc. EtOH heated 1 hr. on the water bath yielded 14 g. yellow precipitate, m. 305° (decomposition); a 13-g. portion, 50 cc. Me2CO, 10 cc. HCl, and 20 cc. H2O refluxed 0.5 hr. gave 1 g. 6-EtO2CCO derivative (VI) of V, m. 115° (decomposition). 2,4-Diallyloxy analog (10 g.) of V and 20 cc. (CO2Et)2 added in a small amount of CH2:CHCH2OH with cooling to 3.2 g. Na in 80 cc. CH2:CHCH2OH and kept at room temperature overnight, and the product dissolved in Me2CO and heated with 10% HCl yielded 12 g. 2,4-diallyloxy analog (VII) of VI, yellow, m. 45° (aqueous EtOH). (CO2Et)2 (5 cc.) and 2 g. 4-amino-2-ethoxy-6-methyl-5-nitropyrimidine in 100 cc. EtOH added to 800 mg. Na in 30 cc. EtOH and heated 3 hrs. on the water bath gave 2.5 g. 4-NH2 analog of VI, yellow, m. 220° (EtOH). VI (10 g.) in 100 cc. AcOEt hydrogenated over Pd-C gave 8 g. 2-carbethoxy-5,7-diethoxy-1,4,6-triazaindene (VIII), m. 141° (Me2CO). VII (3.5 g.) in 35 cc. AcOH treated at 70-80° with 7 g. Zn dust in small portions during 2 hrs., and the oily product (3.1 g.) treated with picric acid yielded the picrate of the 5,7-diallyloxy analog of VIII, yellow, m. 144° (aqueous EtOH). VII (4 g.) in 200 cc. EtOH hydrogenated over Pd-C, and the product heated 6 hrs. with HCl gave 5,7-dioxo-4,5,6,7-tetrahydro-1,4,6-triazaindene-2-carboxylic acid, m. above 360° (H2O). 4-NH2 analog (2 g.) of VI in 300 cc. EtOH hydrogenated over Pd-C gave the 7-NH2 analog of VIII, needles, m. 232° (EtOH).

Chemical & Pharmaceutical Bulletin published new progress about Nucleic acids Role: BIOL (Biological Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Kucuk, Asuman Celik; Yamanaka, Toshiro; Yokoyama, Yuko; Abe, Takeshi published the artcile< Low-cost fluoride source for organic liquid electrolyte-based fluoride shuttle battery>, Category: esters-buliding-blocks, the main research area is fluoride shuttle battery organic liquid electrolyte defluorination.

The effects of using low-cost inorganic fluoride salts (i.e., KF or NaF) as fluoride sources in fluoride shuttle batteries (FSBs) on the electrochem. compatibility of BiF3 electrodes are investigated herein. The preparation of electrolytes containing saturated KF or NaF and 0.5 M 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (DiOB-Py) in G4 is described. For Py/NaF/G4, the discharge and charge reactions of BiF3 were hindered because of the low solubility of NaF as well as the low ionic conductivity of the electrolyte. However, inductively coupled plasma mass spectrometry (ICP-MS) anal. revealed that the solubility of KF in Py/KF/G4 was moderate and the ionic conductivity of Py/KF/G4 was promising. Higher oxidation and reduction peaks observed in the cyclic voltammograms of Py/KF/G4 than those of Py/G4 and Py/NaF/G4 are attributed to the enhanced electrochem. activity of the former. Consequently, the BiF3/C nanocomposite electrode exhibits good cycling capability in Py/KF/G4, with initial discharge/charge capacities of 316/218 mAh g-1, resp. Moreover, the ICP-MS and Raman spectroscopy analyses revealed that defluorination reactions of BiF3 occur via a direct desorption mechanism. Py/KF/G4 is the first effective electrolyte based on a low-cost inorganic salt. FSBs exhibit improved performance in Py/KF/G4 compared with CsF salt systems, which warrants further investigation.

Journal of the Electrochemical Society published new progress about Ball milling. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Syahir, A. Z.; Zulkifli, N. W. M.; Masjuki, H. H.; Kalam, M. A.; Harith, M. H.; Yusoff, M. N. A. M.; Zulfattah, Z. M.; Jamshaid, M. published the artcile< Tribological Improvement Using Ionic Liquids as Additives in Synthetic and Bio-Based Lubricants for Steel-Steel Contacts>, HPLC of Formula: 112-63-0, the main research area is ionic liquid additive synthetic lubricant steel contact tribol.

This study investigates the performance of three ionic liquids (ILs), trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate, trihexyl(tetradecyl)phosphonium decanoate, and 1-butyl-3-methylimidazolium tetrafluoroborate, as lubricant additives in synthetic oil polyalphaolefin (PAO8) and bio-based oil trimethylolpropane trioleate (TMPTO). The ILs were added at 0.5, 1.0, and 1.5 wt% concentrations and evaluated in terms of their miscibility with base oils as well as friction- and wear-reducing abilities. Four-ball and high-frequency reciprocating rig (HFRR) tribotesters were employed to evaluate the tribol. performance under a boundary lubrication regime. Worn steel surfaces were characterized using optical microscopy, profilometry, SEM (SEM), and energy-dispersive X-ray (EDX) anal. The results suggested that the addition of trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate and trihexyl(tetradecyl)phosphonium decanoate improved the tribol. performance of both PAO8 and TMPTO at an optimum concentration of 1 wt%. They showed good friction reduction, lower overall surface wear, and improved surface finishing. 1-Butyl-3-methylimidazolium tetrafluoroborate managed to improve the tribol. performance of both base oils only at 0.5 wt%. A further increase in 1-butyl-3-methylimidazolium tetrafluoroborate concentration caused detrimental effects on the steel surface due to the formation of halogenic compounds

Tribology Transactions published new progress about Abrasive wear. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhang, Yuning; Mesa-Antunez, Pablo; Fortuin, Lisa; Andren, Oliver C. J.; Malkoch, Michael published the artcile< Degradable High Molecular Weight Monodisperse Dendritic Poly(ethylene glycols)>, Electric Literature of 112-63-0, the main research area is PEG dendrimer.

Poly(ethylene glycols) (PEGs) are extensively explored by the pharma industry as foundations for new therapeutic products. PEGs are typically used for their conjugation to active drugs, peptides, and proteins and the likeliness to increase the half-life and enhance the therapeutic outcome. Considering the necessity of batch-to-batch consistency for clin. products, monodisperse PEGs are highly attractive but are generally limited to 5 kDa as an upper mol. weight (Mw) and with an oligomer purity of 95%. By amalgamating short, monodisperse PEGs with dendritic frameworks based on 2,2-bis(methylol)propionic acid polyesters, we showcase a robust synthetic approach to monodisperse PEGs with Mw ranging from 2 to 65 kDa. The latter is, to our knowledge, the highest Mw structure of its kind ever reported. Importantly, the dendritic multifunctional connector facilitated degradability at pH 7.4 at 37°C, which is an important feature for the delivery of therapeutic agents.

Biomacromolecules published new progress about Biocompatibility. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Cao, Wei; Shen, Delong published the artcile< Synthesis of Diclazuril>, Formula: C19H34O2, the main research area is diclazuril synthesis dichloronitroaniline anticoccidial drug.

Diclazuril was synthesized from 2,6-dichloro-p-nitroaniline through seven steps reaction. The yield of diclazuril was about 20%, and its m.p. was 291°. Based on the investigation of laboratory synthesis, the industrial investigation was completed.

Jingxi Huagong Zhongjianti published new progress about Coccidiostats. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhang, Zhen-Hua; Wang, Xing; Wang, Xiao-Jun; Li, Yuesheng; Hong, Miao published the artcile< Tris(2,4-difluorophenyl)borane/Triisobutylphosphine Lewis Pair: A Thermostable and Air/Moisture-Tolerant Organic Catalyst for the Living Polymerization of Acrylates>, HPLC of Formula: 112-63-0, the main research area is difluorophenylborane triisobutylphosphine Lewis pair thermostable catalyst living polymerization acrylate.

Lewis pair polymerization (LPP) has emerged as a powerful tool for the efficient polymerization of polar vinyl monomers. However, air/moisture, highly sensitive metal-based catalysts, and low reaction temperatures are necessary for achieving highly active LPP with a high degree of control. In this contribution, we report the development of a robust Lewis pair (LP) organic catalyst based on tris(2,4-difluorophenyl)borane and triisobutylphosphine, which not only renders efficient and living LPP of acrylates for the first time at ambient or even industrially relevant temperature (60-80°C) but also allows the polymerization under an open-air condition. Accordingly, well-defined multiblock acrylic copolymers have been synthesized successfully over a broad reaction temperature range. Good thermal stability, appreciable air/moisture tolerance, high efficiency, and precise controllability of this LP organic catalyst thus establish LPP as a truly green/sustainable and practical polymerization methodol.

Macromolecules (Washington, DC, United States) published new progress about Chain extension polymerization. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Vinogradova, Ekaterina V.; Mueller, Peter; Buchwald, Stephen L. published the artcile< Structural Reevaluation of the Electrophilic Hypervalent Iodine Reagent for Trifluoromethylthiolation Supported by the Crystalline Sponge Method for X-ray Analysis>, SDS of cas: 112-63-0, the main research area is structural reevaluation electrophilic hypervalent iodine reagent trifluoromethylthiolation; crystalline sponge X ray analysis.

Hypervalent iodine λ3-benziodoxoles are common electrophilic transfer reagents known for their enhanced stability compared to their non-cyclic analogs. Herein we present data showing that chlorobenziodoxole reacts with two different thiolate nucleophiles (thiocyanate and trifluoromethylthiolate), resulting in the formation of stable thioperoxy complexes rather than the expected benziodoxole derivatives We further report a revised structure for the earlier described electrophilic trifluoromethylthiolation reagent (1), which was previously believed to contain the benziodoxole framework. Our findings, which are based on a combination of anal. techniques, including the recently introduced crystalline sponge method for X-ray anal., unambiguously demonstrate that 1 is a thioperoxy compound both in solution and the solid state.

Angewandte Chemie, International Edition published new progress about Crystal structure. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Poulsen, Thomas B.; Alemparte, Carlos; Saaby, Steen; Bella, Marco; Jorgensen, Karl Anker published the artcile< Direct organocatalytic and highly enantio- and diastereoselective Mannich reactions of α-substituted α-cyanoacetates>, Synthetic Route of 112-63-0, the main research area is Mannich stereoselective cyanoacetate imino ester quinidine catalyst.

Highly functionalized mols. with two contiguous stereocenters are easily accessed in high yield with high enantio- and diastereoselectivity by using the com. available organocatalyst (DHQD)2PYR. The easily removed Boc protecting group in the product is an added value to this method as an important tool in asym. synthesis.

Angewandte Chemie, International Edition published new progress about Mannich reaction. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Synthetic Route of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Choi, Chulho; Tian, Shi-Kai; Deng, Li published the artcile< A formal catalytic asymmetric synthesis of (+)-biotin with modified cinchona alkaloids>, SDS of cas: 112-63-0, the main research area is biotin formal catalytic asym synthesis desymmetrization meso cyclic anhydride; vitamin B7 formal catalytic asym synthesis; cinchona alkaloid catalyst desymmetrization meso cyclic anhydride solvolysis; chemoselective reduction hemiester biotin formal catalytic asym synthesis; lactone preparation hemiester chemoselective reduction cyclization.

A formal catalytic asym. synthesis of (+)-biotin (I) was realized. The key steps involve a catalytic, highly enantioselective and quant. desymmetrization of a meso cyclic anhydride followed by a one-pot chemoselective reduction to form the optically active lactone intermediate in the Goldberg-Sternbach (+)-biotin synthesis.

Synthesis published new progress about Lactones Role: SPN (Synthetic Preparation), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Mohammed, Eman H. M.; Mandal, Dindyal; Mozaffari, Saghar; Abdel-Hamied Zahran, Magdy; Osman, Amany Mostafa; Tiwari, Rakesh Kumar; Parang, Keykavous published the artcile< Comparative molecular transporter properties of cyclic peptides containing tryptophan and arginine residues formed through disulfide cyclization>, SDS of cas: 112-63-0, the main research area is lamivudine disulfide peptide arginine HIV infection breast gastric cancer; cancer; cell-penetrating peptide; cellular uptake; cytotoxicity; disulfide bridge; drug delivery; phosphopeptide.

We have previously reported cyclic cell-penetrating peptides [WR]5 and [WR]4 as mol. transporters. To optimize further the utility of our developed peptides for targeted therapy in cancer cells using the redox condition, we designed a new generation of peptides and evaluated their cytotoxicity as well as uptake behavior against different cancer cell lines. Thus, cyclic [C(WR)xC] and linear counterparts (C(WR)xC), where x = 4-5, were synthesized using Fmoc/tBu solid-phase peptide synthesis, purified, and characterized. The compounds did not show any significant cytotoxicity (at 25 μM) against ovarian (SK-OV-3), leukemia (CCRF-CEM), gastric adenocarcinoma (CRL-1739), breast carcinoma (MDA-MB-231), and normal kidney (LLCPK) cells after 24 and 72 h incubation. Both cyclic [C(WR)5C] and linear (C(WR)5C) demonstrated comparable mol. transporter properties vs. [WR]5 in the delivery of a phosphopeptide (F′-GpYEEI) in CCRF-CEM cells. The uptake of F′-GpYEEI in the presence of 1,4-dithiothreitol (DTT) as the reducing agent was significantly improved in case of l(C(WR)5C), while it was not changed by [C(WR)5C]. Fluorescence microscopy also demonstrated a significant uptake of F′-GpYEEI in the presence of l(C(WR)5C). Cyclic [C(WR)5C] improved the uptake of the fluorescent-labeled anti-HIV drugs F′-d4T, F′-3TC, and F′-FTC by 3.0-4.9-fold. These data indicate that both [C(WR)5C] and linear (C(WR)5C) peptides can act as mol. transporters.

Molecules published new progress about Cell proliferation. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics