Pyrimidines

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 591-12-8, is researched, Molecular C5H6O2, about Understanding the Origin of Maleic Anhydride Selectivity during the Oxidative Scission of Levulinic Acid, the main research direction is levulinic acid oxidative scission selectivity maleic anhydride.Name: 5-Methylfuran-2(3H)-one.

Biomass-derived levulinic acid (LA) is a green platform chem., and we have previously reported an oxidative scission pathway that selectively transforms it into maleic anhydride (MA). This reaction is curious because it requires oxidative scission of the terminal (methyl) carbon in levulinic acid, whereas gas-phase Me ketone oxidations are typically selective toward internal (alkyl) bond scission. In order to probe the origin of this disparity, we consider trends observed during the oxidative scission of ketones, keto acids, and keto acid analogs, and we highlight influences of steric hindrances, α-carbon substitution, and the presence of a secondary carboxylic acid functionality. We further consider the role of cyclic intermediates, namely Angelica lactones, in mediating selectivity during the oxidative scission of levulinic acid. Our kinetic anal. is supported by FTIR spectroscopy, which reveals the formation of hydrogen-deficient surface intermediates prior to the onset of oxidative scission. Finally, we pair short-contact-time selectivity anal. with GCMS and NMR spectroscopy to identify a previously undisclosed reaction intermediate-protoanemonin-that forms during the oxidative scission of levulinic acid and α-Angelica lactone. We conclude that facile oxidative dehydrogenation of β-Angelica lactone to form protoanemonin is the major driving force for the high selectivity toward Me scission during levulinic acid oxidation We also note that protoanemonin is an intriguing polyfunctional mol. that appears well-suited to bio-based production, and we have observed that it can be synthesized in yields from 55% to 75% (albeit at low concentration presently) during periods of transient reactor operation.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Synthetic Route of C5H6O2. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Study on the effect of dual solvent proportions on composition of Rosa x damascena concrete oil obtained using soxhlet extraction method. Author is Sofiya, K.; Kumar, G. Bharath.

Concrete oil was extracted from Rosa x damascena using different percentage ratios of solvents (petroleum ether and ethanol) by the Soxhlet extraction method. The extraction was carried out using petroleum ether and ethanol in five different percentage ratios of (volume/volume) (100:0, 75:25, 50:50, 25:75, 0:100) (petroleum ether:ethanol). The rotary vacuum evaporator was used to sep. concrete oil and the solvents. The extracted concrete oil was analyzed using gas chromatog.-mass spectrometry (GC-MS) technique. The obtained results show that many new compounds were identified, at two different solvents and its ratios. Phenylethyl alc. in the percentages of (61.71%), (10.07%) and (25.92%) was obtained as a major compound with the solvent percentages of (100:0), (50:50) and (75:25) (PE:E), resp. Hexacosane (37.2%) was identified as a major compound when pure ethanol is used as a solvent. The highest number of components were identified (totally 93 components) when an equal percentage (50:50) of petroleum ether and ethanol were mixed. The usual monoterpenes components, e.g. geraniol, nerol, citronellol and linalool, were not found in the present extraction study. This study concludes that the compositions of concrete oil were mainly influenced by the type of solvents and its ratios used for the extraction

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 5-Methylfuran-2(3H)-one(SMILESS: O=C1OC(C)=CC1,cas:591-12-8) is researched.COA of Formula: C8H12ClNO2. The article 《Trimetallic Cu-Ni-Zn/H-ZSM-5 Catalyst for the One-Pot Conversion of Levulinic Acid to High-Yield 1,4-Pentanediol under Mild Conditions in an Aqueous Medium》 in relation to this compound, is published in ACS Catalysis. Let’s take a look at the latest research on this compound (cas:591-12-8).

The one-pot direct conversion of levulinic acid (LA) to 1,4-pentanediol (1,4-PDO) was investigated over a trimetallic Zn-promoted Cu-Ni alloy on a H-ZSM-5 (Cu-Ni-Zn/H-ZSM-5) catalyst. Under mild reaction conditions at 130°C and a H2 pressure of 2.5 MPa for 6 h in an aqueous medium, almost complete conversion of LA to high-yield 1,4-PDO (93.4%) was achieved. The presence of the Zn promoter effectively suppressed the growth of the Cu-Ni alloy nanoparticles (NPs) on the surface of H-ZSM-5. Consequently, the reducibility of the Cu-Ni-Zn alloy was much higher than that of the Cu-Ni alloy. The numerous Lewis acid sites of the Cu-Ni-Zn/H-ZSM-5 catalyst enhanced the adsorption of LA, and the adsorbed LA was converted to γ-valerolactone (GVL) at the Bronsted acid sites of H-ZSM-5 followed by hydrogenation at the Cu-Ni alloy sites. Subsequently, the readsorption of GVL was activated at the Lewis acid sites and GVL underwent ring opening, followed by hydrogenation to form 1,4-PDO at the Cu-Ni alloy sites. The H2 spillover on the Zn-promoted Cu-Ni alloy NPs enhanced the hydrogenation of LA to 1,4-PDO. Because of the mild reaction conditions, the formation of coke and active site sintering was highly suppressed. In addition, metal leaching did not occur over the trimetallic Cu-Ni-Zn/H-ZSM-5 catalyst. Consequently, the Cu-Ni-Zn/H-ZSM-5 catalyst could be used for up to five cycles with minimal activity loss.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Wendt, Gerhard; Bernhart, F. W. published the article 《The structure of a sulfur-containing compound with vitamin B6 activity》. Keywords: VITAMIN B 6/chemistry.They researched the compound: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride( cas:148-51-6 ).COA of Formula: C8H12ClNO2. 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:148-51-6) here.

Pyridoxal-HCl (0.001 mole) was added to a warm solution of 0.001 mole 2,4-dinitrophenylhydrazine in 40 ml. of 95% EtOH, the mixture gently heated 5 min., after cooling the orange-yellow crystals collected and suspended 3 times in water with stirring (30 min.) (the crystal color changed to red), filtered off, dried, and recrystallized from iso-BuOH to give yellow crystals of 2,4-dinitrophenylhydrazone, m. 256-7°. To 500 mg. diacetate of bis-4-pyridoxyl disulfide (IV) (500 mg.) in 5 ml. 0.1N HCl was added acetone to a slight turbidity. After standing in the cold, 360 mg. crystals of di-HCl salt separated, m. 222°. IV.2HCl (441 mg.) dissolved in 220 ml. H2O, neutralized with 168 mg. NaHCO3, shaken with 2.0 g. Raney Ni catalyst and 3 atm. H 4 hrs. at 25°, the catalyst removed, the combined filtrates concentrated in vacuo in 10 ml., solid NaHCO3 added to pH 8.6, the solution extracted with CHCl3 30 hrs., the extract concentrated to a sirup which was dissolved in EtOH, and alc. HCl added yielded 250 mg. crystals, m. 264-5°. IV.2HCl (500 mg.), 600 mg. Sn foil, and 6 ml. 4N HCl was shaken 20 hrs. at room temperature; after diluting with H2O the Sn removed as sulfide by filtration, the filtrate dried in vacuo, and recrystallized from EtOH gave 250-300 mg. 4-pyridoxyl mercaptan (VI). VI (100 mg. in 25 ml. H2O) was adjusted to pH 8.5 with 2N NH4OH and air passed through the solution until the nitroprusside test was neg. Oxidation was accompanied by the precipitation of the free base of IV in 66% yield, m. 222°. A mixed sample of SB8.2HCl (Berhart, et al., CA 54, 19993c) and IV.2HCl did not depress the m.p. The identity of both compounds was proved by paper chromatography.

Although many compounds look similar to this compound(148-51-6)COA of Formula: C8H12ClNO2, numerous studies have shown that this compound(SMILES:OC1=C(C)C(CO)=CN=C1C.[H]Cl), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 5-Methylfuran-2(3H)-one(SMILESS: O=C1OC(C)=CC1,cas:591-12-8) is researched.Name: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride. The article 《Enhanced activity of Ru-Ir nanoparticles over SiC for hydrogenation of levulinic acid at room-temperature》 in relation to this compound, is published in Materials Research Bulletin. Let’s take a look at the latest research on this compound (cas:591-12-8).

The hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) under mild condition is a promising but challenging process. Herein, SiC supported Ru-Ir bimetallic catalyst exhibit enhanced catalytic activity for aqueous hydrogenation of LA into GVL under mild conditions. Comparing with monometallic Ir3/SiC and Ru3/SiC, the conversion of LA over bimetallic Ru0.5-Ir2.5/SiC catalyst increase from 51.2% and 45.9% to 100% at 25°C and 0.2 MPa of H2 pressure. The enhanced catalytic activity of Ru0.5-Ir2.5/SiC catalyst originates from the electronic synergistic effect among Ru, Ir and SiC. Due to the electron transfer, electron-richened Ir nanoparticles show stronger ability for H2 dissociation, and the SiC surface produces more active sites to accommodate hydrogen species that spill over from Ir and Ru. The adsorption and hydrogenation of LA mols. occur on the surface of SiC.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Name: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride. 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: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, is researched, Molecular C8H12ClNO2, CAS is 148-51-6, about Inhibition of colitis by ring-modified analogues of 6-acetamido-2,4,5-trimethylpyridin-3-ol. Author is Chaudhary, Chhabi Lal; Chaudhary, Prakash; Dahal, Sadan; Bae, Dawon; Nam, Tae-gyu; Kim, Jung-Ae; Jeong, Byeong-Seon.

6-Aminopyridin-3-ol scaffold has shown an excellent anti-inflammatory bowel disease activity. Various analogs with the scaffold were synthesized in pursuit of the diversity of side chains tethering on the C(6)-position. SAR among the analogs was investigated to understand the effects of the side chains and their linkers on their anti-inflammatory activities. In this study, structural modification moved beyond side chains on the C(6)-position and reached to pyridine ring itself. It expedited to synthesize diverse ring-modified analogs of a representative pyridine-3-ol, 6-acetamido-2,4,5-trimethylpyridin-3-ol. In the evaluation of compounds on their inhibitory actions against TNF-α-induced adhesion of monocytic cells to colonic epithelial cells, an in vitro model mimicking colon inflammation, the effects of compounds I , II, and III were greater than tofacitinib, an orally available anti-colitis drug, and compound dehydroxylated analog II exhibit the greatest activity. In addition, TNF-α-induced angiogenesis, which permits more inflammatory cell migration into inflamed tissues, was significantly blocked by compounds I and II in a concentration-dependent manner. In the comparison of in vivo therapeutic effects of compounds I , II, and III on dextran sulfate sodium (DSS)-induced colitis in mice, compound dehydroxylated analog II was the most potent and efficacious, and compound demethylated analog III was better than compound I which exhibited a similar degree of inhibitory effect to tofacitinib.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride(SMILESS: OC1=C(C)C(CO)=CN=C1C.[H]Cl,cas:148-51-6) is researched.Reference of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride. The article 《Convulsive seizure induced by intracerebral injection of semicarbazide (an anti-vitamin B6) in the mouse》 in relation to this compound, is published in Journal of Nutritional Science and Vitaminology. Let’s take a look at the latest research on this compound (cas:148-51-6).

Intracerebral injection of semicarbazide-HCl (I) [563-41-7] was more effective than systemic administration in inducing convulsions and tremors in mice. The symptoms were prevented by pyridoxine [65-23-6], aminooxyacetic acid [645-88-5] and acetone [67-64-1], but were enhanced by pyridoxal [66-72-8], pyridoxal phosphate [54-47-7] and other anti-B6 agents. Smaller doses of I were required for induction of the symptoms in vitamin B6-deficient mice than in controls. I applied to the vicinity of the lambda caused running fits, followed by convulsions and tremors.

Although many compounds look similar to this compound(148-51-6)Product Details of 148-51-6, numerous studies have shown that this compound(SMILES:OC1=C(C)C(CO)=CN=C1C.[H]Cl), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis of 3-pyridinols. III. Synthesis of pyridoxine skeletons from 4-methyloxazole》. Authors are Yoshikawa, Toru; Ishikawa, Fumiyoshi; Naito, Takeo.The article about the compound:5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloridecas:148-51-6,SMILESS:OC1=C(C)C(CO)=CN=C1C.[H]Cl).Reference of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride. Through the article, more information about this compound (cas:148-51-6) is conveyed.

Pyridoxine dimethyl ether (I) and 4-deoxypyridoxine (II) were synthesized from 4-methyloxazole (III). 3-Cyano-5-hydroxy-6-methylpyridine (IV) was converted via the 4-CN derivative (V) to pyridoxine by the method of Okamoto and Tani (CA 54, 22644d). (MeOCH2CHBr)2 (5.5 g.) refluxed 1 hr. with 1.23 g. KOH in 12 cc. MeOH gave 2.2 g. MeOCH2CBr:CHCH2OMe (VI), b12 75-8°. VI (5.5 g.) and 3.5 g. CuCN heated 7 hrs. at 150° in an autoclave yielded 2.9 g. MeOCH2CH:C(CN)CH2OMe (VII), b8 84-6°. III (0.8 g.), 2.1 g. VII, 0.2 cc. H2O, and 4 cc. AcOH heated 40 hrs. at 95°, and the crude product chromatographed on Al2O3 yielded 2-methyl-4,5-bis(methoxymethyl)-3-pyridinol-HCl (VIII.HCl), m. 143-4° (iso-PrOH); picrate m. 168°. III (0.80 g.), 2.3 g. MeCH:CHCO2Et, 0.18 cc. H2O, and 3 cc. AcOH heated 20 hrs. at 90° in a sealed tube gave 0.2 g. (crude) Et 5-hydroxy-4,6-dimethylnicotinate, m. 146-8° (Me2CO). VIII (80 mg.) in 15 cc. dry tetrahydrofuran treated 72 hrs. at room temperature with 50 mg. LiAlH4 in 15 cc. dry tetrahydrofuran, and the filtered mixture acidified to pH 2 with dilute HCl and evaporated gave II.HCl, m. 255-7° (decomposition) (EtOH). IV (4.0 g.) in 90 cc. AcOH heated 1 hr. at 100° with 6 cc. 30% H2O2, treated twice with addnl. 6 cc. 30% H2O2 each time 1 and 4 hrs. gave 3.3 g. 5hydroxy-6-methylnicotinonitrile 1-oxide (IX), m. 278-80° (decomposition). IX (0.7 g.) and 0.7 g. Et2SO4 heated 2 hrs. at 100-10° gave 0.31 g. 1-ethoxy-2-methyl-3-hydroxy-5-cyanopyridinium ethosulfate, m. 129-30°. IX (0.6 g.) and 0.55 g. Me2SO4 heated 2 hrs. at 100-10°, and the resulting sirup added in 5 cc. H2O dropwise with shaking at 5-7° to 0.65 g. KCN in 8 cc. H2O and kept 1.5 hr. at room temperature gave 0.55 g. V, m. 189-90°.

Although many compounds look similar to this compound(148-51-6)Reference of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, numerous studies have shown that this compound(SMILES:OC1=C(C)C(CO)=CN=C1C.[H]Cl), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

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: (S)-3-Methoxypyrrolidine, is researched, Molecular C5H11NO, CAS is 120099-61-8, about Discovery of β-Arrestin Biased, Orally Bioavailable, and CNS Penetrant Neurotensin Receptor 1 (NTR1) Allosteric Modulators.Electric Literature of C5H11NO.

Neurotensin receptor 1 (NTR1) is a G protein coupled receptor that is widely expressed throughout the central nervous system where it acts as a neuromodulator. Neurotensin receptors have been implicated in a wide variety of CNS disorders but despite extensive efforts to develop small mol. ligands there are few reports of such compounds Herein we describe the optimization of a quinazoline based lead to give 18 (SBI-553(I)), a potent and brain penetrant NTR1 allosteric modulator.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

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 Transmitter synthesis and convulsant drugs: effects of pyridoxal phosphate antagonists and allylglycine, published in 1978-02-15, which mentions a compound: 148-51-6, Name is 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, Molecular C8H12ClNO2, Formula: C8H12ClNO2.

Glutamic acid decarboxylase (EC 4.1.1.15) (I) [9024-58-2] and dopa decarboxylase (EC 4.1.1.26) (II) [9042-64-2] in mouse brain homogenates were inhibited after administration of methyldithiocarbazinate [5397-03-5] (45 mg/kg, i.p.), thiosemicarbazide [79-19-6] (100 mg/kg, i.p.), or 4-deoxypyridoxine-HCl (III) [148-51-6] (250 mg/kg, i.p.); addition of pyridoxal phosphate [54-47-7] abolished the inhibition. I activity was inhibited by allylglycine (IV) [3182-77-2] in vivo (200 mg/kg, i.p.) and in vitro whereas II activity was unaffected. III (250 mg/kg, i.p.) decreased brain GABA [56-12-2] levels, increased homovanillic acid [306-08-1] and 5-hydroxyindoleacetic acid [54-16-0] levels, and did not alter dopamine [51-61-6] and serotonin [50-67-9] levels. Brain GABA levels were decreased by IV while monoamine and monoamine metabolite levels were unchanged. Inhibition of II activity is not the primary or critical mechanism in the convulsant action of hydrazides and IV.

Although many compounds look similar to this compound(148-51-6)Formula: C8H12ClNO2, numerous studies have shown that this compound(SMILES:OC1=C(C)C(CO)=CN=C1C.[H]Cl), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia