Tag: M.W=100-200

Related Products of 20198-19-0. 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: 2-Aminoquinazolin-4(3H)-one, is researched, Molecular C8H7N3O, CAS is 20198-19-0, about Reactions of some quinazoline compounds with ethoxymethylenemalonic acid derivatives. Author is Deady, Leslie W.; Mackay, Maureen F.; Werden, Dianne M..

The reactions of Et (1,4-dihydro-4-oxoquinazolin-2-yl)acetate (I, R = CH2CO2Et) and 2-aminoquinazolin-4(1H)-one (I, R = NH2) with ethoxymethylenemalonate derivatives EtOHC:CR1R2 [R1 = R2 = CO2Et (II); R1 = CN, R2 = CN, CO2Et (III)] are reported, and different results are obtained to those previously found with quinoline analogs. Reaction of I (R = CH2CO2Et) with II gives a pyrido[1,2-a]quinazoline, while with III, 2-(pyridin-2-yl)aminobenzoates IV (R2 = CN, R3 = Et, CH2CH2CH; R2 = CO2Et, R3 = Et) are formed, presumably by ring-opening of intermediate pyrido[2,1-b]quinazolines. Reaction of I (R = NH2) with II likewise results in ultimate cyclization onto N-1 of the quinazoline, while reactions with III give isolable pyrimido[2,1-b]quinazolines. These are readily cleaved under mild conditions. The structure of IV (R2 = CN, R3 = Et) was proved by x-ray crystallog.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 2-Aminoquinazolin-4(3H)-one(SMILESS: O=C1NC(N)=NC2=C1C=CC=C2,cas:20198-19-0) is researched.Quality Control of 2-Aminoquinazolin-4(3H)-one. The article 《Comparative activity of 2-thioxo-, 2-(methylthio)-, 2-(methylseleno)-, and 2-amino-4-quinazolinones toward aromatic amines》 in relation to this compound, is published in O’zbekiston Kimyo Jurnali. Let’s take a look at the latest research on this compound (cas:20198-19-0).

Reactions of title compounds I and II (R = SMe, SeMe, NH2) with arylamines gave II [R = (un)substituted phenyl] were examined The reactivity of the 2-substituents decreased in the following order: SeMe > SMe > NH2 > C:S.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Electric Literature of C6H5N5. 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-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about Facile, highly efficient and novel method for synthesis of 5-substituted 1H-tetrazoles catalysed by. Author is Esirden, Ibrahim; Basar, Erhan; Kaya, Muharrem.

A series of 5-substituted 1H-tetrazole derivatives I [R = 4-pyridinyl, 4-O2NC6H4, 4-acetamidophenyl, etc.] was synthesized via copper(I) chloride catalyzed [3+2] cycloaddition of aryl nitriles with sodium azide. The salient features of this protocol were short reaction times, high yields, environmental friendly catalyst and simple procedure.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about Solvothermal Synthesis and Diverse Coordinate Structures of a Series of Luminescent Copper(I) Thiocyanate Coordination Polymers Based on N-Heterocyclic Ligands, the main research direction is copper thiocyanate aminopyridyltriazole pyridyltetrazole pyridylbenzimidazole polymeric complex preparation structure; crystal structure copper thiocyanate aminopyridyltriazole pyridyltetrazole pyridylbenzimidazole polymeric complex; luminescence copper thiocyanate aminopyridyltriazole pyridyltetrazole pyridylbenzimidazole polymeric complex; thermal decomposition copper thiocyanate aminopyridyltriazole pyridyltetrazole pyridylbenzimidazole polymeric complex.Safety of 5-(4-Pyridyl)-1H-tetrazole.

Solvothermal reactions of CuSCN with 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole (3-Abpt), 5-(4-pyridyl)tetrazole (4-Ptz), and 2-(n-pyridyl)benzimidazole (n-PyHBIm, n = 4, 3, 2) in MeCN afford six novel coordination polymers: [Cu5(SCN)5(3-Abpt)2]n (1), [Cu(SCN)(3-Abpt)]n (2), [Cu(SCN)(4-Ptz)]n (3), [Cu2(SCN)2(4-PyHBIm)]n (4), [Cu2(SCN)2(3-PyHBIm)]n (5), and [Cu2(SCN)2(2-PyBIm)(2-PyHBIm)]n (6). All these complexes were structurally characterized by x-ray diffraction anal. 1 Is the 1st example of a 1,1,1,3-μ4-tetradentate thiocyanate complex which displays a three-dimensional (3D) polymeric framework constructed from thiocyanate and tetradentate 3-Abpt. 2 Exhibits a two-dimensional (2D) 4.82 network constructed from unidentate thiocyanate and tridentate 3-Abpt. 3 Is a 1-dimensional (1D) ladder-like double-chain polymer assembled by bidentate thiocyanate and 4-Ptz ligands. 4 Shows a 2-dimensional 1,1,3-μ3-thiocyanate Cu 4.82 network where bidentate 4-PyHBIm locates at both sides of the 2-dimensional layer. 5 Displays a 2-dimensional 63 network constructing from 1,1,3-μ3-thiocyanate and bidentate 3-PyHBIm. 6 Is a 1-dimensional 21 helical chain polymer constructing from 1,3-μ2-thiocyanate and 2-PyBIm anion. Bond valence sum (BVS) anal. and magnetic susceptibility indicate that 6 is a mixed-valence compound The coordinate diversity of thiocyanate is discussed. 1-6 Are all thermally stable up to 230-290°. They exhibit yellow or blue luminescence originating from ligand-to-metal charge transfer or ligand-centered emission.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about (E)-1,2-Bis(5-aryl-1,3,4-oxadiazol-2-yl)ethenes, the main research direction is ethylenebisoxadiazole preparation; oxadiazole ethylenebis preparation; tetrazole fumaroyl chloride Huisgen.HPLC of Formula: 14389-12-9.

The title compounds (I) were prepared by acylation of the corresponding tetrazoles with fumaryl chloride and subsequent thermal ring transformation. The modified Huisgen reaction renders a new pathway to 3-(1,3,4-oxadiazol-2-yl)propenoic acids and subsequently to I with different substituents.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Reference of 5-(4-Pyridyl)-1H-tetrazole. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about Two Metal-Organic Frameworks Constructed from One-Dimensional Cobalt(II) Ferrimagnetic Chains with Alternating Antiferromagnetic/Ferromagnetic and AF/AF/FM Interaction: Synthesis, Structures, and Magnetic Properties. Author is Yang, Fen; Li, Baiyan; Xu, Wei; Li, Guanghua; Zhou, Qi; Hua, Jia; Shi, Zhan; Feng, Shouhua.

Here, the authors report two three-dimensional metal-organic frameworks [Co2(4-ptz)2(bpp)(N3)2]n (1) and [Co3(OH)2(bdt)2(bpp)2(H2O)2]n (2), which were synthesized by hydrothermal reaction from the resp. tetrazole ligand (5-(4-pyridyl)tetrazole (4-H-ptz) for 1 and 5,5′-(1,4-phenylene)bis(1-H-tetrazole) (H2bdt) for 2), long and flexible pyridyl-containing ligand 1,3-bi(4-pyridyl)propane (bpp), NaN3, and CoCl2. Both 1 and 2 consist of well-isolated 1-dimensional cobalt(II) alternating chains further linked by the bpp and/or the tetrazole ligand, while their chain structures are totally different. The chains of 1 are formed by Co2+ ions bridged by single μ-EE-N3 and triple (μ-EO-N3)(μ-tetrazole)2 alternately, whereas the Co2+ ions are bridged by μ3-OH to form Co3(OH)2 chains in compound 2. Magnetic measurements demonstrate that compound 1 contains an alternating antiferromagnetic (AF)/ferromagnetic (FM) ferrimagnetic chain, while compound 2 exhibits the coexistence of spin canting, slow magnetic dynamics, and finite-size effect, with alternating AF/AF/FM ferrimagnetic chains.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Reactions in sunlight with alcoholic ammonia. VI. The reaction with some indolic compounds》. Authors are Capuano, Salvatore; Giammanco, Lorenzo.The article about the compound:2-Aminoquinazolin-4(3H)-onecas:20198-19-0,SMILESS:O=C1NC(N)=NC2=C1C=CC=C2).Computed Properties of C8H7N3O. Through the article, more information about this compound (cas:20198-19-0) is conveyed.

In view of the results obtained with pyrrolic compounds (C.A. 50, 7807f), and the fact that O is necessary in the reaction of pyrroles with NH3, the behavior of indole (I), α-phenylindole (II), and isatin (III) was studied. The results show that, here too, O is necessary in the sunlight reaction. I (10 g.) in 500 cc. 95.% EtOH saturated with NH3, exposed (while closed) to sunlight for 1 hr., gives a dark red solution and a brown precipitate, which, purified by EtOH, yields 2,4(1H,3H)-quinazolinedione (IV). II (32 g.) in 1000 cc. alc. NH3, exposed (while closed) to sunlight for 6 months, concentrated in vacuo, allowed to stand until the brown oil has solidified, and the solid purified by dioxane, gives 2-phenyl-4(1H)-quinazolinone (V), m. 232-5°. Addition of H2O to the mother liquor precipitates a greenish resin. V can be prepared by the method of Finger-Schupp [J. prakt. Chem. 74, 154(1906)], or as follows: a mixture of equimolar weights o-H2NC6H4CO2H and HN:CPhNH2.HCl, heated until no more NH3 and NH4Cl are evolved, the yellow oil poured into H2O, and the precipitate purified by EtOH or dioxane, gives V, m. 238-40°. III in alc. NH3 gives a dark red solution, which, exposed to sunlight 3 months, precipitates a mixture of a brown substance and white substance. This mixture extracted with hot EtOH, the extract allowed to stand, and the precipitate purified by EtOH, gives 2-imino-2,3-dihydro-4(1H)-quinazolinone (VI). VI and dilute H2SO4, refluxed a long time, give IV. The alc. mother liquor from the separation of VI, concentrated and allowed to stand, and the precipitate purified by AcOH, gives IV. The results show that with I, II, and III, an oxidation reaction takes place at the β-position and that an NH group is introduced between the α- and β-positions. Significant differences in the behavior of pyrroles and indoles in the sunlight process are discussed.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

George, Bobby J.; Dib, Hicham H.; Abdallah, Mariam R.; Ibrahim, Maher R.; Khalil, Nasser S.; Ibrahim, Yehia A.; Al-Awadi, Nouria A. published an article about the compound: 2-Aminoquinazolin-4(3H)-one( cas:20198-19-0,SMILESS:O=C1NC(N)=NC2=C1C=CC=C2 ).Recommanded Product: 2-Aminoquinazolin-4(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:20198-19-0) through the article.

The kinetics, product anal. and theor. studies for selective deprotection of N-arylideneamino pyridone, pyrimidinone and triazinone systems were carried out. Their reactivities were compared with each other and with related compounds previously studied. This reaction represents an efficient, clean and general synthetic procedure for the protection and selective synthesis of potential biol. active pyridines, pyrimidines and triazines and their derivatives

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about Solid state coordination chemistry of metal-1,2,4-triazolates and the related metal-5-(pyrid-4-yl)tetrazolates.Category: chiral-nitrogen-ligands.

A review. This short review focuses on the structural chem. of the coordination polymers of 1,2,4-triazole (Htrz) and the 1,2,4-triazolate ligand (trz) and of 5-(pyrid-4-yl)tetrazolate (pt) which can be considered as an expanded analog of 1,2,4-triazolate. The structures are discussed in terms of some common building blocks and the sorptive and magnetic properties of these materials.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Computed Properties of C8H7N3O. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 2-Aminoquinazolin-4(3H)-one, is researched, Molecular C8H7N3O, CAS is 20198-19-0, about Regioselective synthesis of pyrimido[5,4-c][2,1]benzothiazines by reactions of β-chloroaldehydes with N-C-N binucleophiles. Author is Popov, Kirill; Volovnenko, Tatyana; Turov, Alexander; Volovenko, Yulian.

Pyrimidine ring fusion at the [c] side of benzothiazines by the reaction of 4-chloro-3,4-dihydro-1H-2,1-benzothiazine-3-carboxaldehyde S,S-dioxides with amidines was described. The formation of structural isomers of reaction products was investigated, and the regioselectivity of the heterocyclization was shown. A number of novel pyrimidobenzothiazines were synthesized.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis