Day: April 19, 2022

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: 3411-48-1, is researched, SMILESS is C1=CC2=C(C=C1)C(=CC=C2)P(C1=CC=CC2=C1C=CC=C2)C1=CC=CC2=C1C=CC=C2, Molecular C30H21PJournal, Marine Chemistry called Characterization of minerals and organic phosphorus species in marine sediments using soft x-ray fluorescence spectromicroscopy, Author is Brandes, Jay A.; Ingall, Ellery; Paterson, David, the main research direction is mineral organic phosphorus species marine sediment; soft Xray fluorescence spectromicroscopy.Synthetic Route of C30H21P.

Phosphorus Near Edge X-ray Fluorescence Spectroscopy (P-NEXFS) data were collected on phosphorus containing phases including organic and inorganic compounds and minerals. Although phases containing P in the plus five oxidation state P(V) in a tetrahedral PO4 structure have similar primary fluorescence peak positions, the size, shape, and positions of secondary spectral features are diagnostic for different compounds and minerals. In particular, Ca phosphates exhibited a notable post-peak shoulder at 2154.5 eV, while oxidized iron phosphates had a distinctive pre-peak feature at 2148 eV. Polyphosphates have a broad secondary peak located ∼2 eV higher in energy than a similar feature in phosphate esters and diesters. Compounds containing P(V) in structures other than PO4 tetrahedra such as phosphonates have a primary peak shifted ∼1 eV lower than corresponding organo-phosphates. Organo-phosphates with P in the plus 3 oxidation state P(III) such as phosphines had primary fluorescence peaks shifted still further down in energy (2-3 eV). The substitution of aromatic C groups in close proximity to P structures in organic compounds generated both pre- and post-peak features as well as a number of secondary peaks. X-ray fluorescence mapping of P, Si, Al, Mg, and Na was conducted on a marine sediment sample with sub-micron spatial resolution Phosphorus was heterogeneously distributed in the sample and not correlated on a broad scale with any other element examined Much of the P present in the sample was located in small, 0.6-8 μm size, P-rich domains. Several P-rich regions were examined with P-NEXFS using a focused beam with 60 nm resolution and were found to consist of either calcium phosphate or polyphosphate phases. The presence of significant polyphosphate-dominated regions in a marine sediment sample supports the recent observations that such phases can play an important role in marine P cycling. The combination of fluorescence mapping and P-NEXFS data collection on fine particles provides a powerful new tool for environmental phosphorus studies.

After consulting a lot of data, we found that this compound(3411-48-1)Synthetic Route of C30H21P can be used in many types of reactions. And in most cases, this compound has more advantages.

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

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: 14389-12-9, is researched, Molecular C6H5N5, about γ-Fe2O3. A magnetic separable catalyst for synthesis of 5-substituted 1H-tetrazoles from nitriles and sodium azide, the main research direction is nitrile cycloaddition sodium azide iron oxide catalyst; tetrazole preparation.Safety of 5-(4-Pyridyl)-1H-tetrazole.

An efficient route for the synthesis of 5-substituted 1H-tetrazole via [2+3] cycloaddition of nitriles and sodium azide is reported using γ-Fe2O3 nanoparticles as a magnetic separable catalyst. Under optimized conditions, the moderate to good yields (71-95%) were obtained. The catalyst was easily separated by a magnet and reused for several circles.

After consulting a lot of data, we found that this compound(14389-12-9)Safety of 5-(4-Pyridyl)-1H-tetrazole can be used in many types of reactions. And in most cases, this compound has more advantages.

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

Synthetic Route of C6H5N5. 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 Synthesis of 5-substituted 1H-tetrazoles from aryl halides using nanopolymer-anchored palladium(II) complex as a new heterogeneous and reusable catalyst. Author is Tajbakhsh, Mahmood; Alinezhad, Heshmatollah; Nasrollahzadeh, Mahmoud; Kamali, Taghi A..

This paper reports on the preparation and use of chloromethylated polystyrene-anchored palladium(II) complex, [Ps-ttet-Pd(II)], as a separable nanocatalyst for the synthesis of 5-substituted 1H-tetrazoles by treating aryl halides with K4[Fe(CN)6] as non-toxic cyanide source, to generate in situ the corresponding aryl nitriles which then react through [2 + 3] cycloaddition with sodium azide. High yields of the products, simple methodol., easy work-up procedure, high catalytic activity and superior cycling stability of the catalyst are the main advantages of this protocol. The structure of the catalyst was characterized using the powder XRD, SEM, TG-DTA, EDS, AAS, and FT-IR spectroscopy techniques.

After consulting a lot of data, we found that this compound(14389-12-9)Synthetic Route of C6H5N5 can be used in many types of reactions. And in most cases, this compound has more advantages.

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 A rapid and novel method for the synthesis of 5-substituted 1H-tetrazole catalyzed by exceptional reusable monodisperse Pt NPs@AC under the microwave irradiation.Application of 14389-12-9.

A series of 5-substituted 1H-tetrazoles I (R = 4-O2NC6H4, 4-BrC6H4, 4-MeC6H4, etc.) were synthesized in DMF by the [3 + 2] cycloaddition reaction under the effect of microwave irradiation (10-30 min, fixed mode, 90 °C, 140 W) in the presence of highly efficient superior catalyst. For this reaction, different aromatic nitriles with the sodium azide were used and superior monodisperse (Md) platinum nanoparticles (Pt NPs) decorated on activated carbon (AC) served as a catalyst. Md-Pt NPs@AC were reproducibly and easily produced by double solvent reduction of PtCl4 in room temperature and characterized by transmission electron microscopy (TEM), the high resolution electron micrograph (HRTEM), X-ray diffraction (XRD), at. force microscopy (AFM) and XPS. The sum of their results shows the formation of highly crystalline and colloidally stable Md-Pt NPs@AC. The catalytic performance of these new NPs were investigated for the synthesis of 5-substituted 1H-tetrazoles, in which they were found to be exceptional reusable, isolable, stable and highly efficient heterogeneous catalyst. All prepared tetrazole products were obtained with perfect yield by using current heterogeneous catalyst.

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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

Application In Synthesis of 1,2-Bis(diphenylphosphino)ethane. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Tertiary phosphine-appended transition metal ferrocenyl dithiocarbamates: Syntheses, Hirshfeld surface, and electrochemical analyses. Author is Singh, Amita; Dutta, Archisman; Singh, Ashish Kumar; Trivedi, Manoj; Kociok-Koehn, Gabriele; Muddassir, Mohd.; Kumar, Abhinav.

Five new heteroleptic complexes of Cu(I), Ag(I), and Ni(II) having formulas [Cu3(dtc)2(dppf)2]PF6 (Cu-I), [Cu3(dtc)2(dppe)2]PF6 (Cu-II), [Cu(PPh3)2(dtc)] (Cu-III), [Ag3(dtc)2(PPh3)2]NO3 (Ag-I), and [Ni(dtc)(dppf)]PF6 (Ni-I) (dtc = N-ethanol-N-methylferrocenyl-dithiocarbamate; dppf = 1,1′-bis(diphenylphosphino)ferrocene; dppe = 1,1′-bis(diphenylphosphino)ethane; PPh3 = tripheylphosphine) have been synthesized and characterized using elemental anal., Fourier-transform IR, multinuclear NMR, UV-Vis spectroscopy, and single-crystal X-ray diffraction. The single-crystal X-ray diffraction studies indicate that Ag-I forms a rare trinuclear cluster in which the geometry around the two silver centers Ag1 and Ag3 is distorted tetrahedral, whereas the third silver center Ag2 shows a distorted trigonal planar geometry. The Ni-I complex has a distorted square-planar geometry around the Ni center. In addition, a side product [Ag2{S2(dppf)2}] (Ag-II) was obtained during an attempt to synthesize [Ag(dppf)(dtc)], where the two Ag centers are bridged by two sulfido centers and coordinated with two phosphorus centers of the dppf ligand to give rise to a distorted tetrahedral geometry. The solid-state structures of Ag-I, Ni-I, and Ag-II are stabilized by a variety of weak interactions. The nature of these interactions has been addressed with the help of Hirshfeld surface analyses. In addition, the weak argentophilic interaction in Ag-I and Ag-II have been studied using quantum theory of atoms in mols. and natural bond orbital calculations The electrochem. properties of the complexes have been investigated using cyclic voltammetry, where Cu-I and Cu-II exhibited two quasi-reversible waves, whereas Cu-III, Ag-I, Ag-II, and Ni-I exhibited only one quasi-reversible peak.

Although many compounds look similar to this compound(1663-45-2)Application In Synthesis of 1,2-Bis(diphenylphosphino)ethane, numerous studies have shown that this compound(SMILES:P(CCP(C1=CC=CC=C1)C2=CC=CC=C2)(C3=CC=CC=C3)C4=CC=CC=C4), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

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

Anamika; Yadav, Dharmendra Kumar; Manar, Krishna K.; Yadav, Chote Lal; Kumar, Kamlesh; Ganesan, Vellaichamy; Drew, Michael G. B.; Singh, Nanhai published the article 《New heteroleptic [Ni(II) 1,1-dithiolate-phosphine] complexes: synthesis, characterization and electrocatalytic oxygen evolution studies》. Keywords: nickel dithiolatophenylcyclohexanedione bisdiphenylphosphinoethane diphenylphosphinomonosulfidemethane complex preparation redox potential; crystal structure nickel dithiolatophenylcyclohexanedione bisdiphenylphosphinoethane diphenylphosphinomonosulfidemethane complex.They researched the compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2 ).Quality Control of 1,2-Bis(diphenylphosphino)ethane. 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:1663-45-2) here.

Four new heteroleptic Ni() complexes with general formula [Ni()(LL’)], L = 2-(methylene-1,1′-dithiolato)-5-phenylcyclohexane-1,3-dione (L1) and 2-(methylene-1,1′-dithiolato)-5,5′-dimethylcyclohexane-1,3-dione (L2); L’ = 1,2-bis(diphenylphosphino)ethane (dppe) and bis(diphenylphosphino)monosulfide methane (dppms) were synthesized and characterized by elemental anal. and spectroscopy (IR, UV-Vis, 1H, 13C{1H} and 31P{1H} NMR). All complexes 1-4 were characterized by PXRD and single crystal X-ray crystallog. The solid state mol. structures revealed distorted square planar geometry about the four-coordinate Ni(II) metal center together with rare Ni···H-C intra/intermol. anagostic interactions in axial positions. In these complexes supramol. structures were sustained by non-covalent C-H···O, C-O···H-O, C-H···π, C-H···π (NiCS2, chelate), π···π and H···H interactions. Their electrocatalytic properties were investigated for oxygen evolution reaction (OER) in which complex 2 showed the highest activity with 10 mA cm-2 at the potential of 1.58 V vs. In addition, complex 2 also exhibits an OER onset potential at 1.52 V vs.

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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

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: 6684-39-5, is researched, Molecular C5H3Cl2NO2S, about Antidiabetic Disruptors of the Glucokinase-Glucokinase Regulatory Protein Complex Reorganize a Coulombic Interface, the main research direction is antidiabetic interaction coulombic interface glucokinase complex regulatory protein GKRP.SDS of cas: 6684-39-5.

The glucokinase regulatory protein (GKRP) plays an essential role in glucose homeostasis by acting as a competitive inhibitor of glucokinase (GCK) and triggering its localization to the hepatocyte nucleus upon glucose deprivation. Metabolites such as fructose 6-phosphate and sorbitol 6-phosphate promote assembly of the GCK-GKRP complex, whereas fructose 1-phosphate and functionalized piperazines with potent in vivo antidiabetic activity disrupt the complex. Here, we establish the mol. basis by which these natural and synthetic ligands modulate the GCK-GKRP interaction. We demonstrate that a small-mol. disruptor of the protein-protein interaction utilizes a two-step conformational selection mechanism to associate with a rare GKRP conformation constituting 3% of the total population. Conformational heterogeneity of GKRP is localized to the N-terminus and deleting this region eliminates the ability of sorbitol 6-phosphate to promote the GCK-GKRP interaction. Stabilizing ligands favor an extended N-terminus, which sterically positions two arginine residues for optimal coulombic interaction with a pair of carboxylate side chains from GCK. Conversely, disruptors promote a more compact N-terminus in which an interfacial arginine residue is stabilized in an unproductive orientation through a cation-π interaction with tyrosine 75. Eliminating the ability to sample this binding impaired conformation enhances the intrinsic inhibitory activity of GKRP. Elucidating the mol. basis of ligand-mediated control over the GCK-GKRP interaction is expected to impact the development and future refinement of therapeutic agents for diabetes and cardiovascular disease, which result from improper GKRP regulation of GCK.

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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

Category: chiral-nitrogen-ligands. 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: 2-Aminoquinazolin-4(3H)-one, is researched, Molecular C8H7N3O, CAS is 20198-19-0, about Synthesis and in vitro evaluation of 2-aminoquinazolin-4(3H)-one-based inhibitors for tRNA-guanine transglycosylase (TGT). Author is Meyer, Emmanuel A.; Furler, Maya; Diederich, Francois; Brenk, Ruth; Klebe, Gerhard.

TRNA-Guanine transglycosylase (TGT) plays a key role in the post-transcriptional modification of tRNA. It has been linked with the pathogenicity of shigellae, the causative agents of bacillary dysentery (shigellosis). Here, we report structure-activity relationships (SARs) for a new series of 2-aminoquinazolin-4(3H)-one-based inhibitors of TGT, resulting from structure-based design (Fig. 2). Versatile synthetic protocols allow selective functionalization of the 2-aminoquinazolin-4(3H)-one core (Schemes 1-6) with H-bond-donor groups in position 6 (for H-bonding to the C = O group of Leu231) and lipophilic residues in position 8 for reaching into a shallow, newly discovered lipophilic pocket lined by Val282, Val45, and Leu68. The binding mode of several of these ligands in the active site of TGT was established by crystal structure analyses (Figs. 4 and 6). A dramatic S effect was observed, with the replacement of the S-atom in the (phenylsulfanyl)methyl residue in position 8 of inhibitor 1c (Ki = 100 nM) by the O-atom (in 1h, Ki = 5.6 μM) or CH2 (in 1i, Ki = 3.6 μM), resulting in a massive loss of activity (Fig. 3). Crystal structure anal. showed that the lipophilic Me group points into a highly polar region of the active site encompassed by the side chains of Asp280 and Asp102 and collides directly (d(C…O) = 3.1 Å) with one of the O-atoms of the carboxylate of Asp102. Similarly, lipophilic linkers departing from position 8 and orienting residues in the shallow hydrophobic pocket presumably encounter analogous unfavorable contacts, accounting for the modest contribution to the binding free enthalpy upon introduction of these residues. These findings provide a valuable starting point for future structure-based lead optimization cycles leading to TGT inhibitors with increased in vitro potency.

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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 2-Aminoquinazolin-4(3H)-one. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 2-Aminoquinazolin-4(3H)-one, is researched, Molecular C8H7N3O, CAS is 20198-19-0, about Quinazolines as inhibitors of dihydrofolate reductase. 1.

2,4-Diaminoquinazolines were potent in vitro inhibitors of rat liver dihydrofolate reductase [9002-03-3]. The most potent compound, 6-bromo-5-chloro-2,4-diaminoquinazoline (I) [41934-85-4], produced 50% inhibition at 0.10 μM, and was thus nearly as effective an inhibitor as pyrimethamine. I was prepared from 5-chloro-2,4,6-triaminoquinazoline [17511-20-5] by diazotization of the 6-amino group in 2N MeSO3H and reaction with CuBr in 50% HBr.

Although many compounds look similar to this compound(20198-19-0)Reference of 2-Aminoquinazolin-4(3H)-one, numerous studies have shown that this compound(SMILES:O=C1NC(N)=NC2=C1C=CC=C2), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

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

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: 3411-48-1, is researched, SMILESS is C1=CC2=C(C=C1)C(=CC=C2)P(C1=CC=CC2=C1C=CC=C2)C1=CC=CC2=C1C=CC=C2, Molecular C30H21PJournal, Article, Research Support, Non-U.S. Gov’t, Journal of Medicinal Chemistry called Synthesis and structure-activity analysis of new phosphonium salts with potent activity against african trypanosomes, Author is Taladriz, Andrea; Healy, Alan; Flores Perez, Eddysson J.; Herrero Garcia, Vanessa; Rios Martinez, Carlos; Alkhaldi, Abdulsalam A. M.; Eze, Anthonius A.; Kaiser, Marcel; de Koning, Harry P.; Chana, Antonio; Dardonville, Christophe, the main research direction is phosphonium salt diphosphonium benzyl phenethyl bridged preparation trypanosomicide agent; quaternization diphosphonium salt preparation trypanosomicide activity QSAR field analysis; benzyl phenethyl halide preparation quaternization phosphine phosphonium trypanosomicide activity.Application In Synthesis of Tri(naphthalen-1-yl)phosphine.

A series of 73 bisphosphonium salts [R1R2R3P+(CH2)n-1,4-C6H4-L-1,4-C6H4(CH2)nP+R1R2R3]X2 and 10 monophosphonium salt derivatives [Ph-L-1,4-C6H4CH2PR1R2R3]Br, [4-MeC6H4CH2P+Ph3]X (R1-R3 = alkyl, Ph, substituted Ph, 2-thienyl, 2-furyl, 1-naphthyl; L = CO, CH2, O, SO2, NAc; X = Cl, Br) were synthesized and tested in vitro against several wild type and resistant lines of Trypanosoma brucei (T. b. rhodesiense STIB900, T. b. brucei strain 427, TbAT1-KO, and TbB48). More than half of the compounds tested showed a submicromolar EC50 against these parasites. The compounds did not display any cross-resistance to existing diamidine therapies, such as pentamidine. In most cases, the compounds displayed a good selectivity index vs. human cell lines. None of the known T. b. brucei drug transporters were required for trypanocidal activity, although some of the bisphosphonium compounds inhibited the low affinity pentamidine transporter. It was found that phosphonium drugs act slowly to clear a trypanosome population but that only a short exposure time is needed for irreversible damage to the cells. A comparative mol. field anal. model (CoMFA) was generated to gain insights into the SAR of this class of compounds, identifying key features for trypanocidal activity.

Although many compounds look similar to this compound(3411-48-1)Application In Synthesis of Tri(naphthalen-1-yl)phosphine, numerous studies have shown that this compound(SMILES:C1=CC2=C(C=C1)C(=CC=C2)P(C1=CC=CC2=C1C=CC=C2)C1=CC=CC2=C1C=CC=C2), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

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