Month: December 2022

Qin, Tao published the artcileCobalt-Catalyzed Radical Hydroamination of Alkenes with N-Fluorobenzenesulfonimides, Synthetic Route of 103-26-4, the publication is Angewandte Chemie, International Edition (2021), 60(49), 25949-25957, database is CAplus and MEDLINE.

An efficient and general radical hydroamination of alkenes using Co(salen) as catalyst, N-fluorobenzenesulfonimide (NFSI) and its analogs as both nitrogen source and oxidant was successfully disclosed. A variety of alkenes, including aliphatic alkenes, styrenes, α, β-unsaturated esters, amides, acids, as well as enones, were all compatible to provide desired amination products. Mechanistic experiments suggest that the reaction underwent a metal-hydride-mediated hydrogen atom transfer (HAT) with alkene, followed by a pivotal catalyst controlled SN₂-like pathway between in-situ generated organocobalt(IV) species and nitrogen-based nucleophiles. Moreover, by virtue of modified chiral cobalt(II)-salen catalyst, an unprecedented asym. version was also achieved with good to excellent level of enantiocontrol. This novel asym. radical C-N bond construction opened a new door for the challenging asym. radical hydrofunctionalization.

Angewandte Chemie, International Edition published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Synthetic Route of 103-26-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Hafizi, Hamid published the artcileMagnetically recyclable Schiff-based palladium nanocatalyst [Fe₃O₄@SiNSB-Pd] and its catalytic applications in Heck reaction, Recommanded Product: Methyl 3-phenyl-2-propenoate, the publication is Arabian Journal of Chemistry (2022), 15(7), 103914, database is CAplus.

A magnetically separable palladium nanocatalyst has been synthesized through the immobilization of palladium onto 3-aminopropylphenanthroline Schiff based functionalized silica coated superparamagnetic Fe₃O₄ nanoparticles. The nanocatalyst (Fe₃O₄@SiNSB-Pd) was fully characterized using several spectroscopic techniques, such as FT-IR, HR-SEM, TEM, XRD, ICP, and XPS. The microscopic image of Fe₃O₄ showed spherical shape morphol. and had an average size of 150 nm. The Pd-nanoparticles exhibited an average size 3.5 ± 0.6 nm. The successful functionalization of Fe₃O₄@SiNSB-Pd was identified by FT-IR spectroscopy and the appearance of palladium species in Fe₃O₄@SiNSB-Pd was confirmed by XRD anal. While XPS has been utilized for the determination of the chem. oxidation state of palladium species in Fe₃O₄@SiNSB-Pd. Several activated and deactivated arene halides and olefines were employed for Mizoroki-Heck cross-coupling reactions in the presence of Fe₃O₄@SiNSB-Pd, each of which produced the resp. cross-coupling products with excellent yields. The Fe3O4@SiNSB-Pd shows good reactivity and reusability for up to seven consecutive cycles.

Arabian Journal of Chemistry published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Recommanded Product: Methyl 3-phenyl-2-propenoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Peng published the artcileCatalytic Azido-Hydrazination of Alkenes Enabled by Visible Light: Mechanistic Studies and Synthetic Applications, Quality Control of 5205-11-8, the publication is Advanced Synthesis & Catalysis (2019), 361(24), 5565-5575, database is CAplus.

A visible-light-enabled catalytic intermol. azido-hydrazination method for unactivated alkenes was developed via an orderly radical addition sequence. This transformation features metal-free and redox-neutral conditions and was applicable to a wide range of alkenes with com. available reagents. Mechanistic and kinetic studies reveal that the efficient generation of azide radical enabled by fluorenone under visible-light was critical to this methodol. The β-azido alkyl hydrazines prepared with this reaction can be conveniently derived to valuable synthetic building blocks, and one of the products has been successfully applied in the total synthesis of (±)-ibrutinib, which was used to treat B cell cancers.

Advanced Synthesis & Catalysis published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H16N2O2, Quality Control of 5205-11-8.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Pan, Zhenxue published the artcileSynthesis and properties of new multifunctional photosensitive carbosilanes, Quality Control of 15625-89-5, the publication is Tetrahedron Letters (2022), 153931, database is CAplus.

Though the phys. blending polymeric preceramic and photosensitive compounds has been proved an easily scaled-up and cost-effective approach to prepare photocurable precursors for most of silicon-based ceramics, there is still scarce of practical photocurable precursor system to SiC ceramic, due to poor compatibility between polycarbosilane and com. available photosensitizers. Also, in contrast to intensive research on polymeric precursor, no attention has been paid on development of photosensitive compounds for preceramic polymers. In this work, a series of photosensitive carbosilanes containing Si-C backbone and acrylate group was designed and synthesized, which showed good compatibility with polycarbosilanes. The calculation result on the solubility parameters of the carbosilanes and polycarbosilanes well explained their good compatibility. The UV-curing behavior and thermal properties of the photosensitive carbosilanes and their blend systems with polycarbosilanes were also studied. This work provides useful guidelines for selecting and designing photosensitive compounds have good compatibility with preceramic polymers.

Tetrahedron Letters published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, Quality Control of 15625-89-5.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Khachatoorian, Careen published the artcileE-cigarette fluids and aerosol residues cause oxidative stress and an inflammatory response in human keratinocytes and 3D skin models, Safety of Methyl 3-phenyl-2-propenoate, the publication is Toxicology In Vitro (2021), 105234, database is CAplus and MEDLINE.

Our goal was to evaluate the effects of EC refill fluids and EC exhaled aerosol residue (ECEAR) on cultured human keratinocytes and MatTek EpiDerm, a 3D air liquid interface human skin model. Quantification of flavor chems. and nicotine in Dewberry Cream and Churrios refill fluids was done using GC-MS. The dominant flavor chems. were maltol, ethyl maltol, vanillin, Et vanillin, benzyl alc., and furaneol. Cytotoxicity was determined with the MTT and LDH assays, and inflammatory markers were quantified with ELISAs. Churrios was cytotoxic to keratinocytes in the MTT assay, and both fluids induced ROS production in the medium (ROS-Glo) and in cells (CellROX). Exposure of EpiDerm to relevant concentrations of Dewberry Cream and Churrios for 4 or 24 h caused secretion of inflammatory markers (IL-1α, IL-6, and MMP-9), without altering EpiDerm histol. Lab made fluids with propylene glycol (PG) or PG plus a flavor chem. did not produce cytotoxic effects, but increased secretion of IL-1α and MMP-9, which was attributed to PG. ECEAR derived from Dewberry Cream and Churrios did not produce cytotoxicity with Epiderm, but Churrios ECEAR induced IL-1α secretion. These data support the conclusion that EC chems. can cause oxidative damage and inflammation to human skin.

Toxicology In Vitro published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Safety of Methyl 3-phenyl-2-propenoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Song, Mingzhang published the artcileEffect of viscoelasticity on the foaming behavior of long-chain branched polypropylene with different branching degrees analysed by using bubble-growth modelling, Recommanded Product: Trimethylolpropane triacrylate, the publication is Polymer (2022), 124397, database is CAplus.

Long-chain branched polypropylene (LCB-PP) was generated by a melt grafting reaction with trimethylolpropane triacrylate (TMPTA) as the grafting monomer and zinc dimethyldithiocarbamate (ZDMC) or styrene (St) as the co-monomers. High-temperature size exclusion chromatog. (HT-SEC) was used to characterize the mol. mass, mol. mass distribution and branching degree of the modified PP. Subsequently, linear and nonlinear viscoelasticity data were obtained by a small amplitude oscillatory shear (SAOS) test and uniaxial extensional viscosity measurement. The pressure balanced bubble-growth (PBB) model was used to calculate the critical coalescence radius (CCR) curves for PP to quant. correlate the viscoelasticity and foamability and evaluate the foamability of PP combined with batch foaming. It is shown that with increasing branching degree, the foam shows a better resistance to bubble coalescence, resulting in a more regular bubble structure and a higher expansion ratio. Moreover, viscosity should be controlled over an appropriate range for realizing good foamability; otherwise, excessive viscosity can suppress bubble growth and limit the expansion ratio. MPPZ4 modified with 4 wt% TMPTA and 0.4 wt% ZDMC showed the best foamability. A combination of the PBB model and batch foaming experiment is used to quant. explain the contribution of LCB to foaming.

Polymer published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C22H21N3O3S, Recommanded Product: Trimethylolpropane triacrylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Lin, Geng-Jie published the artcileEnantiodivergent synthesis of trans-3,4-disubstituted succinimides by SmI₂-mediated Reformatsky-type reaction, HPLC of Formula: 106391-88-2, the publication is Tetrahedron Letters (2008), 49(25), 4007-4010, database is CAplus.

An enantiodivergent strategy for the synthesis of trans-3,4-disubstituted succinimides is reported. The key step is a highly trans-stereoselective SmI₂-induced Reformatsky-type reaction of 4-substituted O-benzoylated malimides with carbonyl compounds Double chirality transmissions were performed with good to excellent diastereoselectivities.

Tetrahedron Letters published new progress about 106391-88-2. 106391-88-2 belongs to esters-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Aldehyde, name is (R)-tert-Butyl (3-methyl-1-oxobutan-2-yl)carbamate, and the molecular formula is C10H19NO3, HPLC of Formula: 106391-88-2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Bollenbach, Maud published the artcileDesign and synthesis of 3-aminophthalazine derivatives and structural analogues as PDE5 inhibitors: anti-allodynic effect against neuropathic pain in a mouse model, Product Details of C9H8O4, the publication is European Journal of Medicinal Chemistry (2019), 269-290, database is CAplus and MEDLINE.

Herein, a series of aminophthalazine I [R = H, Ph, 1-piperidyl, etc.; R¹ = H, CF₃; R² = 3-ClC₆H₄NH, 4-MeOC₆H₄CH₂NH, Ph(CH₂)₂NH, etc.] and aminoindazole derivatives II [R³ = H, Cl, CF₃; R⁴ = H, Me, Ph, etc.; R⁵ = 3-ClC₆H₄, 4-MeOC₆H₄CH₂, 3-F-4-MeOC₆H₃CH₂, etc.] were synthesized and evaluated for their inhibitory activity toward PDE5. Selectivity profiles towards other PDE1-4 isoenzymes, water solubility and stability in acidic medium of the most potent PDE5 inhibitors were determined and the aminophthalazine I [R = Ph, R¹ = CF₃, R² = 4-OMeC₆H₄CH₂NH] and its mimetic compound II [R³ = CF₃, R⁴ = 3-pyridyl, R⁵ = 4-OMeC₆H₄CH₂NH] were evaluated in comparison to MY 5445 in vivo in a model of neuropathic pain induced by sciatic nerve cuffing in mice (3 and 0.5 mg/kg, i.p. twice a day). Both compounds showed the same efficacy on neuropathic allodynia as MY 5445 and thus produced a significant relief of mech. hypersensitivity after 12 days of treatment.

European Journal of Medicinal Chemistry published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C9H8O4, Product Details of C9H8O4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Hu, Tianjiao published the artcileRu-NHC-Catalyzed Asymmetric Hydrogenation of 2-Quinolones to Chiral 3,4-Dihydro-2-Quinolones, Application In Synthesis of 30414-53-0, the publication is Angewandte Chemie, International Edition (2021), 60(43), 23193-23196, database is CAplus and MEDLINE.

The Ru(II)-NHC-catalyzed asym. hydrogenation of 2-quinolones under mild reaction conditions was developed. Alkyl-, aryl- and halogen-substituted optically active dihydro-2-quinolones I [R = H, Me; R¹ = Me, Bn; R² = H, Me, Et, i-Pr, Ph; R³ = H; R⁴ = H, Me, Ph, etc.; R⁵ = H, OMe, F, etc.; R⁶ = H, Me; R¹R³ = (CH₂)₃] were obtained in high yields with moderate to excellent enantioselectivities. The reaction provided an efficient and atom-economic pathway to construct simple chiral 3,4-dihydro-2-quinolones. The desired products could be further reduced to tetrahydroquinolines and octahydroquinolones.

Angewandte Chemie, International Edition published new progress about 30414-53-0. 30414-53-0 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ketone,Ester, name is Methyl 3-oxovalerate, and the molecular formula is C6H10O3, Application In Synthesis of 30414-53-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Iaffaldano, Pietro published the artcileRisk of Getting COVID-19 in People With Multiple Sclerosis: A Case-Control Study., Category: esters-buliding-blocks, the publication is Neurology(R) neuroimmunology & neuroinflammation (2022), 9(2), database is MEDLINE.

BACKGROUND AND OBJECTIVES: Several studies have assessed risk factors associated with the severity of COVID-19 outcomes in people with multiple sclerosis (PwMS). The potential role of disease-modifying therapies (DMTs) and demographic and clinical factors on the risk of acquiring SARS-CoV-2 infection has not been evaluated so far. The objective of this study was to assess risk factors of contracting SARS-CoV-2 infection in PwMS by using data collected in the Italian MS Register (IMSR). METHODS: A case-control (1:2) study was set up. Cases included PwMS with a confirmed diagnosis of COVID-19, and controls included PwMS without a confirmed diagnosis of COVID-19. Both groups were propensity score-matched by the date of COVID-19 diagnosis, the date of last visit, and the region of residence. No healthy controls were included in this study. COVID-19 risk was estimated by multivariable logistic regression models including demographic and clinical covariates. The impact of DMTs was assessed in 3 independent logistic regression models including one of the following covariates: last administered DMT, previous DMT sequences, or the place where the last treatment was administered. RESULTS: A total of 779 PwMS with confirmed COVID-19 (cases) were matched to 1,558 PwMS without COVID-19 (controls). In all 3 models, comorbidities, female sex, and a younger age were significantly associated (p < 0.02) with a higher risk of contracting COVID-19. Patients receiving natalizumab as last DMT (OR [95% CI]: 2.38 [1.66-3.42], p < 0.0001) and those who underwent an escalation treatment strategy (1.57 [1.16-2.13], p = 0.003) were at significantly higher COVID-19 risk. Moreover, PwMS receiving their last DMT requiring hospital access (1.65 [1.34-2.04], p < 0.0001) showed a significant higher risk than those taking self-administered DMTs at home. DISCUSSION: This case-control study embedded in the IMSR showed that PwMS at higher COVID-19 risk are younger, more frequently female individuals, and with comorbidities. Long-lasting escalation approach and last therapies that expose patients to the hospital environment seem to significantly increase the risk of SARS-CoV2 infection in PwMS. CLASSIFICATION OF EVIDENCE: This study provides Class III evidence that among patients with MS, younger age, being female individuals, having more comorbidities, receiving natalizumab, undergoing an escalating treatment strategy, or receiving treatment at a hospital were associated with being infected with COVID-19. Among patients with MS who were infected with COVID-19, a severe course was associated with increasing age and having a progressive form of MS, whereas not being on treatment or receiving an interferon beta agent was protective.

Neurology(R) neuroimmunology & neuroinflammation published new progress about 624-49-7. 624-49-7 belongs to esters-buliding-blocks, auxiliary class Inhibitor,Natural product, name is Dimethyl fumarate, and the molecular formula is C6H8O4, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics