Category: pyrimidines

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis of vitamin B6 derivatives. Catalytic reduction of hydroxymethyl group substituted in pyridine ring》. Authors are Naito, Takeo; Ueno, Katsujiro.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).Quality Control of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride. Through the article, more information about this compound (cas:148-51-6) is conveyed.

Catalytic reduction of 1.64 g. pyridoxine triacetate-HCl in 32 mL. H2O with 1 g. 10% Pd-C 1.5 h. at normal pressure of H absorbed 240 mL. H and gave 0.7 g. 3,4,6,5-Me3(OH)C5HN.HCl (I), m. 209-12°. Similarly, pyridoxine 4-Et ether HCl salt yielded 52% I, m. 210-12°. The above reaction with 1 mol absorption of H yielded 18% 4,6,3,5-Me2(HOCH2)(HO)C5HN.HCl (II), m. 250° (decomposition), and the mother liquor yielded 31% 3,6,4,5-Me2(EtOCH2)(HO)C5HN.HCl; picrate m. 138°. Catalytic reduction of 0.56 g. 6,3,4,5-Me(AcOCH2)(EtOCH2)(HO)C5HN.HCl in 20 mL. MeOH with 0.8 g. 10% Pd-C showed no absorption of H, the reduction proceeded well by addition of 20 mL. H2O and absorbed 54 mL. H in 2 h., and the product in 10% HCl heated 30 min. at 100° yielded 48.8% 3,6,4,5-Me2(EtOCH2)(HO)C5HN; picrate, m. 138°. Catalytic reduction of 3.76 g. pyridoxal oxime-HCl in 170 mL. H2O and 88 mL. 10% HCl with 4.8 g. 10% Pd-C absorbed 3050 mL. H in 20 h. and yielded 62% 3,6,4,5-Me2(HCl.H2NCH2)(HO)C5HN.HCl (III), m. 262-3° (decomposition); diacetate, C12H16O3N2, m. 176-7°; ditosylate-HCl, m. 194-5°. Catalytic reduction of 0.29 g. 6,3,4,5-Me(AcOCH2)(AcNHCH2)(AcO)C5HN in 8 mL. MeOH and 2.2 mL. 10% HCl-MeOH showed no absorption H but an addition of 10 mL. H2O absorbed 28 mL. H in 2 h. and yielded 100% diacetate of III, m. 174°. Similarly, 0.51 g. pyridoxal-HCl in 20 mL. H2O and 0.5 g. 10% Pd-C yielded 30% II, m. 246-8°. Catalytic reduction of 0.58 g. pyridoxal Et hemiacetal-HCl (IV) in 20 mL. EtOH and 0.5 g. 10% Pd-C (1 mol H absorbed) yielded 79% 6,5,3,4-Me(HO)(CH2OCH2)C5HN.HCl (V), m. 233-4°; picrate m. 186-7°. Similarly, 0.58 g. IV, 20 mL. H2O and 0.5 g. Pd-C yielded 40% II, m. 248-50°; 0.58 g. IV, 20 mL. HCl, 2.7 mL. 10% HCl and 0.5 g. Pd-C yielded 68% V, m. 225-30°. Catalytic reduction of 1.09 g. 2-HOCH2C5H4 N in 15 mL. MeOH and 51 mL. 5% HCl-MeOH with 1 g. Pd-C (260 mL. H absorbed in 2 h.) yielded 90% 2-MeC5H4N (VI); picrate m. 164-5°. Similarly, 1.23 g. 2-MeOCH2C5H4N in 15 mL. MeOH and 51 mL. 5% HCl-MeOH with 0.1 g. Pd-C (255 mL. H absorbed) yielded 91% 2-MeC5H4N; or, 2-AcOCH2C5H4N, in a similar way, yielded 88% 2-MeC5H4N. 2-HOCH2C5H4N.HCl (8 g.) added dropwise into 40 g. SOCl2 with cooling, refluxed 2 h., cooled, 100 mL. C6H6 added and the product filtered off gave 8.8 g. 2-ClCH2C5H4N (VII); picrate m. 146-7°. MeONa (2.72 g. Na and 55 mL. MeOH) treated dropwise with VII in 20 mL. MeOH, refluxed 1 h., the solvent removed and the residue extracted with Et2O gave 4.7 g. 2-MeOCH2C5H4N, b18 76-8°. Similarly are prepared (product, b.p./mm. and m.p. picrate given): 3-MeOCH2C5H4N, 92-4°/20, 117-18°; 4-MeOCH2C5H4N, 91-2°/19, 108-9°.

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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 《Derivatives of pyridine and quinoline. LII. Synthesis of 2,4-dimethyl-3-hydroxy-5-(hydroxymethyl)pyridine (4-desoxyadermine)》. Authors are van Wagtendonk, H. M.; Wibaut, J. P..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).COA of Formula: C8H12ClNO2. Through the article, more information about this compound (cas:148-51-6) is conveyed.

cf. C. A. 35, 5112.3. NCCH2CONH2 and CH2Ac2 with piperidine in EtOH at 80° give 87% of 4,6-dimethyl-3-cyano-2-pyridone (I), m. 293° (corrected); with HNO3 (d. 1.52) in Ac2O at 5°, I gives a crude yield of 40-6% of the 5-NO2 derivative which with PCl5 in PhCl gives 24-8% of 2,4-dimethyl-3-nitro-5-cyano-6-chloropyridine (II), yellow, m. 114-15°. Catalytic reduction of II with Pd-C in 96% EtOH gives 81.4% of 2,4-dimethyl-3-amino-5-cyano-6-chloropyridine, m. 149-9.2° (corrected); further reduction with Pd-C catalyst in AcOH-AcONa at room temperature gives 2,4-dimethyl-3-amino-5-(aminomethyl)pyridine, characterized as the dipicrate, m. 244° (decomposition), and the di-HCl salt (III), with 1 mol. H2O, does not m. 300°. Reaction of III in 2 N H2SO4 with NaNO2 at 80° gives 2,4-dimethyl-3-hydroxy-5-(hydroxymethyl)pyridine (4-desoxyadermine), isolated as the HCl salt, m. 257°.

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Yang, Mengchen; Chen, Chen; Yi, Xing; Li, Yuan; Wu, Xiaoqin; Li, Qingshan; Ban, Shurong published an article about the compound: 5-Methylfuran-2(3H)-one( cas:591-12-8,SMILESS:O=C1OC(C)=CC1 ).Name: 5-Methylfuran-2(3H)-one. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:591-12-8) through the article.

New chiral thiosquaramides and their applications in catalytic asym. double addition of 5-methyl-2(3H)-furanones to nitroolefins were described. Enantiomerically enriched 2,4,4-trisubstituted butenolides bearing a quaternary stereogenic center could be smoothly constructed with high diastereoselectivities (up to >99 : 1 dr) and excellent enantioselectivities (up to 95% ee) under mild conditions.

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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 Hypoxia-selective antitumor agents. 6. 4-(Alkylamino)nitroquinolines: a new class of hypoxia-selective cytotoxins, published in 1992-12-25, which mentions a compound: 18436-73-2, Name is 4-Chloro-8-methylquinoline, Molecular C10H8ClN, Synthetic Route of C10H8ClN.

A series of isomeric 4-[[3-(dimethylamino)propyl]amino]nitroquinolines, e.g., I [Rn = H, 3-, 5-, 6-, 7-, 8-NO2, 2,5-Me(O2N), 3,5-Me(O2N), 6,5-Me(O2N), 8,5-Me(O2N), 7,8-Me(O2N), 7,6-Me(O2N), 2,3-Me(O2N)], has been synthesized and evaluated as hypoxia-selective cytotoxins and as radiosensitizers of hypoxic cells. The compounds showed widely-differing hypersensitivity factors (ratios of cytotoxicity against wild-type and repair-deficient mammalian cells). Many compounds showed oxygen-sensitive bioreduction resulting in DNA alkylation, while others show oxygen-insensitive modes of action. Of the nitro isomers studied, the 5-nitro showed the greatest hypoxic selectivity. A series of ring-substituted analogs were then prepared, in an effort to lower its reduction potential of -286 mV. Structure-activity studies showed that the effects of substitution on reduction potential were complex, being mediated by electronic and steric effects on the nitro group, as well as by effects on quinoline pKa. Two compounds of lower reduction potential, the 3- and 8-Me analogs, showed improved selectivity (47- and 60-fold in a clonogenic assay). These two compounds also showed the highest in vitro therapeutic indexes of the series as hypoxic cell radiosensitizers. Despite these favorable in vitro properties, neither compound had activity against hypoxic cells in SCCVII tumors when administered at 60% of the maximum tolerated dose.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Smoking cessation in severe mental illness: what works?》. Authors are Banham, Lindsay; Gilbody, Simon.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).Synthetic Route of C8H12ClNO2. Through the article, more information about this compound (cas:148-51-6) is conveyed.

AIMS: The physical health of people with severe mental illness (SMI) is poor. Smoking-related illnesses are a major contributor to excess mortality and morbidity. An up-to-date review of the evidence for smoking cessation interventions in SMI is needed to inform clinical guidelines. METHODS: We searched bibliographic databases for relevant studies and independently extracted data. Included studies were randomized controlled trials (RCTs) of smoking cessation or reduction conducted in adult smokers with SMI. Interventions were compared to usual care or placebo. The primary outcome was smoking cessation and secondary outcomes were smoking reduction, change in weight, change in psychiatric symptoms and adverse events. RESULTS: We included eight RCTs of pharmacological and/or psychological interventions. Most cessation interventions showed moderate positive results, some reaching statistical significance. One study compared behavioural support and nicotine replacement therapy (NRT) to usual care and showed a risk ratio (RR) of 2.74 (95% CI 1.10-6.81) for short-term smoking cessation, which was not significant at longer follow-up. We pooled five trials that effectively compared bupropion to placebo giving an RR of 2.77 (95% CI 1.48-5.16), which was comparable to Hughes et al.’s 2009 figures for general population data; RR = 1.69 (95% CI 1.53-1.85). Smoking reduction data were too heterogeneous for meta-analysis, but results were generally positive. Trials suggest few adverse events. All trials recorded psychiatric symptoms and the most significant changes favoured the intervention groups over the control groups. CONCLUSIONS: Treating tobacco dependence is effective in patients with SMI. Treatments that work in the general population work for those with severe mental illness and appear approximately equally effective. Treating tobacco dependence in patients with stable psychiatric conditions does not worsen mental state.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Efficient formation of γ-valerolactone in the vapor-phase hydrogenation of levulinic acid over Cu-Co/alumina catalyst, the main research direction is valerolactone levulinic acid hydrogenation copper cobalt alumina catalyst.Computed Properties of C5H6O2.

Vapor-phase hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) was investigated over Al2O3-supported bimetallic Cu-Co catalysts with different Cu/Co weight ratios under ambient H2 pressure. The bimetallic Cu-Co/Al2O3 catalyst with a Cu/Co weight ratio of 8/12 exhibits an excellent catalytic activity and stability: it showed a high GVL productivity of 5.46 kg kg-1cat. h-1 with a GVL selectivity higher than 99% at 250°C for 24 h. In the characterization of the catalysts, powder X-ray diffraction suggests that bimetallic Cu-Co particles on the Cu-Co/Al2O3 catalysts are composed of an alloy.

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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 Amino derivatives of pyridoxine and its analogs, published in 1979-06-30, which mentions a compound: 148-51-6, Name is 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, Molecular C8H12ClNO2, Application In Synthesis of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride.

Treatment of pyridines I (R = OH, R1 = Me, R2 = CH2OH (II); RR1 = OCMe2CH2O, R2 = CH2OH; R = OH, R1 = CH2OH, R2 = Me) with OP(NMe2)3 gave III (R = OH, R1 = Me, R2 = CH2NMe2 (IV); R = OH, R1 = CH2OH, R2 = CH2NMe2; R = OH, R1 = CH2 NMe2, R2 = Me). Heating II with SOCl2 gave I (R = OH, R1 = Me, R2 = CH2Cl), which was transformed to IV by reaction with Me2NH. Reaction of I (R3 = Cl) with HNMe2 gave I (R3 = NMe2).

Compound(148-51-6)Application In Synthesis of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride received a lot of attention, and I have introduced some compounds in other articles, similar to this compound(5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride), if you are interested, you can check out my other related articles.

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HPLC of Formula: 591-12-8. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Effect of infrared ray roasting on oxidation stability and flavor of virgin rapeseed oils. Author is Yu, Jie; Wang, Mengzhu; Zhang, Mi; Liu, Yuanfa; Li, Jinwei.

Effects of IR ray roasting (IRR) on the oxidation stability and flavors of virgin rapeseed oil (VROs) at 110-170°C were investigated and compared with traditional roller roasting (TRR). Results showed that IRR samples showed lower acid and peroxides values, higher oxidation stability index, and 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity than TRR ones. IRR samples displayed better thermal expansion of rapeseed for internal fragmentation from microstructures, which facilitated the release of tocophenols (652.63-748.78 mg/kg) and 4-vinylsyringol (7.54-678.19 mg/kg), compared with TRR ones with tocophenols (652.63-689.28 mg/kg) and 4-vinylsyringol (7.54-524.18 mg/kg) contributing to better oxidation stability. Moreover, important volatile compounds, including pyrazines, isothiocyanates, nitriles and aldehydes, were formed quant. more in IRR than TRR samples, which was attributed to better heat transfer efficiency and internal fragmentation promoting complex reactions inside rapeseed. Therefore, IRR has more pos. roasting effects on VROs than TRR.

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Liu, Hui; Zhang, Junhui; Liu, Jingyong; Chen, Laiguo; Huang, Hongyi; Evrendilek, Fatih published an article about the compound: 5-Methylfuran-2(3H)-one( cas:591-12-8,SMILESS:O=C1OC(C)=CC1 ).Name: 5-Methylfuran-2(3H)-one. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:591-12-8) through the article.

Textile dyeing sludge (TDS) is a highly toxic solid waste whose co-pyrolysis can jointly achieve waste reduction and recovery of value-added products. This study aimed to fill the knowledge gaps about the co-pyrolysis mechanisms and products (gases and solids) and their dynamics in response to the atm. type, blend ratio, heating rate, temperature, and their interactions. The high temperature pyrolysis (>720 °C) in the CO2 atmosphere appeared as the best option for the waste reduction The (co-)pyrolysis in the CO2 atmosphere enhanced S-containing air pollutants, CO, and CH4 but reduced NOx. The interaction effect between TDS and durian shell (DS) residues promoted the productions of furan and acid compounds and inhibited the productions of aromatic, phenolic, and N-containing compounds The atmosphere type affected the type and strength of the reactions involved in the production of biochars. Our findings provide practical and new insights into the optimization of energy generation, product recovery, and emission control during the (co-)pyrolysis.

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 5-Methylfuran-2(3H)-one( cas:591-12-8 ) is researched.Reference of 5-Methylfuran-2(3H)-one.Howe, Alexander G. R.; Maunder, Rhodri; Morgan, David J.; Edwards, Jennifer K. published the article 《Rapid microwave-assisted polyol synthesis of TiO2-supported ruthenium catalysts for levulinic acid hydrogenation》 about this compound( cas:591-12-8 ) in Catalysts. Keywords: titania ruthenium catalyst levulinic acid hydrogenation microwaveassisted polyol method. Let’s learn more about this compound (cas:591-12-8).

One wt% Ru/TiO2 catalysts prepared by a one-pot microwave-assisted polyol method have been shown to be highly active for Levulinic acid hydrogenation to γ-Valerolactone. Preparation temperature, microwave irradiation time and choice of Ru precursor were found to have a significant effect on catalyst activity. In the case of Ru(acac)3-derived catalysts, increasing temperature and longer irradiation times increased catalyst activity to a maximum LA conversion of 69%. Conversely, for catalysts prepared using RuCl3, shorter preparation times and lower temperatures yielded more active catalysts, with a maximum LA conversion of 67%. Catalysts prepared using either precursor were found to contain highly dispersed nanoparticles <3 nm in diameter XPS anal. of the most and least active catalysts shows that the catalyst surface is covered in a layer of insoluble carbon with surface concentrations exceeding 40% in some cases. This can be attributed to the formation of large condensation oligomers from the reaction between the solvent, ethylene glycol and its oxidation products, as evidenced by the presence of C-O and C = O functionality on the catalyst surface. Compound(591-12-8)Reference of 5-Methylfuran-2(3H)-one received a lot of attention, and I have introduced some compounds in other articles, similar to this compound(5-Methylfuran-2(3H)-one), if you are interested, you can check out my other related articles.

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