Category: pyrimidines

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 591-12-8, is researched, SMILESS is O=C1OC(C)=CC1, Molecular C5H6O2Journal, Article, Research Support, N.I.H., Extramural, Research Support, U.S. Gov’t, Non-P.H.S., Organic Letters called Construction of Enantioenriched γ,γ-Disubstituted Butenolides Enabled by Chiral Amine and Lewis Acid Cascade Cocatalysis, Author is Yu, Chenguang; Ji, Peng; Zhang, Yueteng; Meng, Xiang; Wang, Wei, the main research direction is butenolide preparation enantioselective regioselective chemoselective; alkynoic acid aldehyde tandem cyclization amine Lewis catalyst.COA of Formula: C5H6O2.

A cascade cocatalysis strategy for the facile construction of chiral γ,γ-disubstituted butenolides I (R1 = Me, Et; R2 = Ph, 1-naphthyl, 2-furyl, etc.) has been described. The synthetic manifold employs simple alkynoic acids R1CCCH2C(O)2H instead of the preformed silyloxy furans or 5-substituted furan-2(3H)-ones II. In situ formed 5-substituted furan-2(3H)-ones II by AgNO3 or Ph3PAuCl/AgOTf catalyzed cyclization of alkynoic acids can smoothly engage in the subsequent chiral diphenylprolinol TMS-ether catalyzed Michael and Michael-aldol reactions. The cascade process serves as a general approach to chiral quaternary γ,γ-disubstituted butenolides I.

From this literature《Construction of Enantioenriched γ,γ-Disubstituted Butenolides Enabled by Chiral Amine and Lewis Acid Cascade Cocatalysis》,we know some information about this compound(591-12-8)COA of Formula: C5H6O2, but this is not all information, there are many literatures related to this compound(591-12-8).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Gao, Zengrong published the article 《Separation and identification of water-soluble vitamins and vitamin B6 analogs》. Keywords: vitamin identification chromatog spectrometry TLC; liquid chromatog vitamin identification; IR spectrometry vitamin identification; UV spectrometry vitamin identification.They researched the compound: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride( cas:148-51-6 ).SDS of cas: 148-51-6. 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.

Vitamin B12  [68-19-9], vitamin B1  [59-43-8], folic acid  [59-30-3], calcium pantothenate  [137-08-6], rutin  [153-18-4], vitamin C  [50-81-7], vitamin B2  [83-88-5], nicotinamide  [98-92-0], nicotinic acid  [59-67-6], p-aminobenzoic acid  [150-13-0], pyridoxal 5-phosphate  [54-47-7], pyridoxol-HCl  [58-56-0], pyridoxamine-2HCl  [524-36-7], pyridoxal-HCl  [65-22-5], and 4-deoxypyridoxol-HCl  [148-51-6] were identified by TLC (using various solvent systems), high-performance liquid chromatog., IR and UV spectrophotometry. Characteristics (Rf values, retention times, absorbances) of these compounds are tabulated.

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Reference:
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 《Preparation of 5-hydroxy-4,6-dimethyl-3-pyridinemethanol (4-deoxypyridoxine) by the use of hydrazine》. Authors are Taborsky, Robert G..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.

2-Methyl-3-hydroxy-4-methoxymethyl-5-hydroxymethylpyridine-HCl (10 g.) and 50 ml. 95% N2H4 refluxed 18 hrs., most of the N2H4 removed in vacuo, and the residue extracted with 60 ml. refluxing MeOH yielded N2H4.HCl, m. 91-2°. The volume of the filtrate reduced to 20 ml., 15 ml. 11.2% MeOH-HCl added, the precipitate isolated, and 50 ml. Et2O added gave a further precipitate The total yield was 8.1 g. 2-methyl-3-hydroxy-4-methyl-5-hydroxymethylpyridine-HCl (I), m. 273° (decomposition). All conditions and isolation procedures were as above except that instead of the 4-Me ether, 5 g. pyridoxine-HCl and 25 ml. 95% N2H4 were used to give 98% I.

From this literature《Preparation of 5-hydroxy-4,6-dimethyl-3-pyridinemethanol (4-deoxypyridoxine) by the use of hydrazine》,we know some information about this compound(148-51-6)Reference of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, but this is not all information, there are many literatures related to this compound(148-51-6).

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Product Details of 18436-73-2. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 4-Chloro-8-methylquinoline, is researched, Molecular C10H8ClN, CAS is 18436-73-2, about Nucleophilic substitution reaction of chloroquinolines with 1,2,4-triazole. I. Synthesis of 4-(1H-1,2,4-triazol-1-yl)quinolines. Author is Korodi, Ferenc.

Synthesis of 4-(1H-1,2,4-triazol-1-yl)quinolines by the reaction of 4-chloroquinolines with 1,2,4-triazole was studied under neutral, acidic and basic reaction conditions. The significant role of acid and base catalysis as well as substituent effects on the reactivity of 4-chloroquinolines in these reactions are reported.

From this literature《Nucleophilic substitution reaction of chloroquinolines with 1,2,4-triazole. I. Synthesis of 4-(1H-1,2,4-triazol-1-yl)quinolines》,we know some information about this compound(18436-73-2)Product Details of 18436-73-2, but this is not all information, there are many literatures related to this compound(18436-73-2).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 591-12-8, is researched, SMILESS is O=C1OC(C)=CC1, Molecular C5H6O2Journal, Green Chemistry called Synthesis of water-soluble, fully biobased cellulose levulinate esters through the reaction of cellulose and alpha-angelica lactone in a DBU/CO2/DMSO solvent system, Author is Pei, Min; Peng, Xinwen; Shen, Yuqing; Yang, Yunlong; Guo, Yuanlong; Zheng, Qiang; Xie, Haibo; Sun, Hui, the main research direction is biobased cellulose levulinate ester.SDS of cas: 591-12-8.

Cellulose esters are important cellulose derivatives with good processing ability and material properties. The design and sustainable synthesis of cellulose esters are prime research topics. Herein, cellulose levulinate esters (CLEs) with degrees of substitution (DSs) ranging from 0.15 to 2.04 were simply prepared through an atom-economic reaction between cellulose dissolved in a newly developed 1.8-diazabicyclo[5.4.0]undec-7-ene/dimethyl sulfoxide/carbon dioxide solvent system and alpha-angelica lactone, a biomass-derived and com. available platform chem., without the addition of any external catalysts or condensation reagents. The optimized reaction conditions of 120°C, 0.5 h, and a 5/1 molar ratio of alpha-angelica lactone to the hydroxyl groups in cellulose resulted in CLEs with appropriate DSs and satisfactory material properties. The structures and thermal properties of the CLEs were characterized by NMR spectroscopy, Fourier transform IR spectroscopy, differential scanning calorimetry, and thermal gravimetric anal. to develop an in-depth understanding of the correlations among the chem. structures, thermal properties, and mech. properties. A study of solubility in conventional solvents indicated that the CLEs with appropriate DSs were soluble in water, providing a green processing strategy to prepare CLE films with tensile strengths of up to 72 MPa and elongation at break values of up to 26.7%. The morphologies of the films were characterized by SEM and at. force microscopy. The cytotoxicity of the water-soluble CLEs was also evaluated in vaginal epithelial cells (VK2/E6E7) to identify the potential of the CLEs for biomedical applications.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Formula: C5H6O2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Combined targeted and untargeted profiling of volatile aroma compounds with comprehensive two-dimensional gas chromatography for differentiation of virgin olive oils according to variety and geographical origin. Author is Lukic, Igor; Carlin, Silvia; Horvat, Ivana; Vrhovsek, Urska.

Comprehensive two-dimensional gas chromatog. with time-of-flight mass spectrometry (GC × GC-TOF-MS) was combined with conventional mono-dimensional GC-MS to differentiate Croatian virgin olive oils (VOO) according to variety and geog. origin, based on the profile of volatile aroma compounds isolated by HS-SPME. More than 1000 compounds were detected after untargeted profiling and 256 were identified or tentatively identified, providing one of the most detailed profiles of volatile aroma compounds in VOO up to date. Among them, 131 volatile compounds were significantly different across monovarietal VOOs, while 60 were found useful for the discrimination according to geog. origin. Many major lipoxygenase and minor non-lipoxygenase-generated compounds were shown to have discriminating ability with respect to both factors. Multivariate statistical anal. extracted twenty-one volatile markers with the highest discriminant power for varietal differentiation. The approach reported may have practical application in better understanding, defining, managing, and communicating the varietal or geog. typicity of monovarietal VOOs.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Chen, Junli; Campbell, Adrian P.; Urmi, Kaniz F.; Wakelin, Laurence P. G.; Denny, William A.; Griffith, Renate; Finch, Angela M. published the article 《Human α1-adrenoceptor subtype selectivity of substituted homobivalent 4-aminoquinolines》. Keywords: human adrenoceptor selectivity homobivalent aminoquinoline; 4-Aminoquinolines; 5-HT(1A)-receptor; Affinity; Selectivity; α(1)-adrenoceptor.They researched the compound: 4-Chloro-8-methylquinoline( cas:18436-73-2 ).COA of Formula: C10H8ClN. 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:18436-73-2) here.

A series of ring-substituted ethyl- and heptyl-linked 4-aminoquinoline dimers were synthesized and evaluated for their affinities at the 3 human α1-adrenoceptor (α1-AR) subtypes and the human serotonin 5-HT1A-receptor (5-HT1A-R). We find that the structure-specificity profiles are different for the two series at the α1-AR subtypes, which suggests that homobivalent 4-aminoquinolines can be developed with α1-AR subtype selectivity. The 8-Me ethyl-linked analog has the highest affinity for the α1A-AR, 7 nM, and the greatest capacity for discriminating between α1A-AR and α1B-AR (6-fold), α1D-AR (68-fold), and the 5-HT1A-R (168-fold). α1B-AR selectivity was observed with the 6-Me derivative of the ethyl- and heptyl-linked 4-aminoquinoline dimers and the 7-methoxy (7-OMe) derivative of the heptyl-linked analog. These substitutions result in 4- to 80-fold selectivity for α1B-AR over α1A-AR, α1D-AR, and 5-HT1A-R. In contrast, 4-aminoquinoline dimers with selectivity for α1D-AR are more elusive, since none studied to date has greater affinity for the α1D-AR over the other two α1-ARs. The selectivity of the 8-Me ethyl-linked 4-aminoquinoline dimer for the α1A-AR, and 6-Me ethyl-linked, and the 6-Me and 7-OMe heptyl-linked 4-aminoquinoline dimers for the α1B-AR, makes them promising leads for drug development of α1A-AR or α1B-AR subtype selective ligands with reduced 5-HT1A-R affinity.

There is still a lot of research devoted to this compound(SMILES：CC1=C2N=CC=C(Cl)C2=CC=C1)COA of Formula: C10H8ClN, and with the development of science, more effects of this compound(18436-73-2) can be discovered.

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

COA of Formula: C5H6O2. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Mechanism research on catalytic pyrolysis of sulfated polysaccharide using ZSM-5 catalysts by Py-GC/MS and density functional theory studies. Author is Jiang, Ding; Xia, Zhen; Wang, Shuang; Li, Hongping; Gong, Xun; Yuan, Chuan; El-Fatah Abomohra, Abd; Cao, Bin; Hu, Xun; He, Zhixia; Wang, Qian.

The mechanisms of primary product formation on catalytic pyrolysis of seaweed sulfated polysaccharide with ZSM-5 were examined in detail by using Py-GC/MS anal. and subsequent d. functional theory. Results showed that furfurals were the main product (50.3%) in bio-oil during the catalytic pyrolysis of sulfated polysaccharides. Furfural (9.1%), 5-(Hydroxymethyl)-2(5 H)-furanone (3.1%) and acetone (3.2%) were defined as typical products of Glucuronic acid unit. 5-Me furfural (41.2%), 5-methyl-2(3 H)-Furanone (0.5%) and 5-Me furan (5.4%) can be converted from rhamnose unit. The subsequent d. functional theory calculation indicated that the catalytic pyrolysis of sulfated polysaccharides by ZSM-5 catalyst could boost the pyrolysis and upgrade the bio-oil quality since the promotion of hydrodeoxygenation on catalytic reactions and ZSM-5 could promote the formation of 5-Me furfural. The hydrogen bonding and van der Waals force interactions improved the pyrolysis pathways and decreased the energy barrier, which promoted the pyrolysis. This study confirmed that ZSM-5 had a catalytic influence on pyrolysis of sulfated polysaccharides through theor. and exptl. anal., which is helpful to understand the formation mechanism of seaweed catalytic pyrolysis products.

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Reference:
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 《Biological comparison of synthetic and natural adermin》. Authors are Moller, E. F.; Zima, O.; Jung, F.; Moll, Th..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.

Synthetic adermin was assayed by its influence on growth and acid formation by Streptobact. plantarum (C. A. 32, 9165.1); curves of growth (turbidity) and acidity vs. time are given. The synthetic preparation is slightly more active than the vitamin preparation made from rice hulls. A growth effect upon Streptobact. plantarum is likewise exhibited by 2,4-dimethyl-3-hydroxy-5-(hydroxymethyl)pyridine (hydrochloride m. 254°) although in 50-fold dose the result was only 30-40% of that of the B6 hydrochloride. The 4-desoxyadermin in single doses of 1000 γ is inactive on dermatitic rats.

There is still a lot of research devoted to this compound(SMILES：OC1=C(C)C(CO)=CN=C1C.[H]Cl)Reference of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, and with the development of science, more effects of this compound(148-51-6) can be discovered.

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Piperidin-4-amine dihydrochloride( cas:35621-01-3 ) is researched.SDS of cas: 35621-01-3.Takai, Haruki; Obase, Hiroyuki; Nakamizo, Nobuhiro; Teranishi, Masayuki; Kubo, Kazuhiro; Shuto, Katsuichi; Hashimoto, Tamotsu published the article 《Synthesis and pharmacological evaluation of piperidine derivatives with various heterocyclic rings at the 4-position》 about this compound( cas:35621-01-3 ) in Chemical & Pharmaceutical Bulletin. Keywords: antiulcer antiinflammatory antihypertensive heterocyclylpiperidine preparation; structure activity antihypertensive heterocyclylpiperidine; piperidine heterocyclyl preparation biol activity. Let’s learn more about this compound (cas:35621-01-3).

A series of piperidine derivatives with various heterocyclic rings at the 4-position, e.g. I, II, was prepared and tested for antihypertensive activity and other biol. activities. The antihypertensive effects of the present compounds in the spontaneous hypertensive rat were less potent than those of previously reported compounds However, some exhibited antiulcer and/or antiinflammatory activity. Structure-activity relationships are discussed.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia