Author: Jessica.F

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 Stability profiling of anti-malarial drug piperaquine phosphate and impurities by HPLC-UV, TOF-MS, ESI-MS and NMR, published in 2014, which mentions a compound: 837-52-5, Name is 7-Chloro-4-(piperazin-1-yl)quinoline, Molecular C13H14ClN3, Reference of 7-Chloro-4-(piperazin-1-yl)quinoline.

Background Piperaquine, 1,3-bis-[4-(7-chloroquinolyl-4)-piperazinyl-1]-propane, is an anti-material compound belonging to the 4-aminoquinolines, which has received renewed interest in treatment of drug resistant falciparum malaria in artemisinin-based combination therapy with dihydroartemisinin. The impurity profile of this drug product is paid an ever-increasing attention. However, there were few published studies of the complete characterization of related products or impurities in piperaquine phosphate bulk and forced degradation samples. Methods The impurities in piperaquine phosphate bulk drug substance were detected by a newly developed gradient phase HPLC method and identified by TOF-MS and ESI-MS. The structures of impurities were confirmed by NMR. Forced degradation studies were also performed for the stability of piperaquine phosphate bulk drug samples and the specificity of the newly developed HPLC method. In silico toxicol. predictions for these piperaquine phosphate related impurities were made by Toxtree and Derek. Results Twelve impurities (imp-1-12) were detected and identified, of which eight impurities (imp-1, 2, 4, 6-10) were first proposed as new related substances. Based on TOF-MS/ESI-MS and NMR anal., the structures of imp-2, 6 and 12 were characterized by their synthesis and preparation The possible mechanisms for the formation of impurities were also discussed. These piperaquine phosphate related impurities were predicted to have a toxicity risk by Toxtree and Derek. Conclusions From forced degradation and bulk samples of piperaquine phosphate, twelve compounds were detected and identified to be piperaquine phosphate related impurities. Two of the new piperaquine phosphate related substances, imp-2 and imp-6, were identified and characterized as 4-hydroxy-7-chloro-quinoline and a piperaquine oxygenate with a piperazine ring of nitrogen oxide in bulk drug and oxidation sample, resp. The MS data of imp-1, 2, 4, 6-10 were first reported. The in-silico toxicol. prediction showed a toxicity risk for piperaquine related impurities by Toxtree and Derek.

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Reference:
Bromide – Wikipedia,
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Name: 7-Chloro-4-(piperazin-1-yl)quinoline. 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: 7-Chloro-4-(piperazin-1-yl)quinoline, is researched, Molecular C13H14ClN3, CAS is 837-52-5, about Synthesis of novel amodiaquine analogs and evaluation of their in vitro and in vivo antimalarial activities. Author is Tahghighi, Azar; Parhizgar, Arezoo Rafie; Karimi, Safoura; Irani, Mahboubeh.

In this study, new amodiaquine (AQ) analogs I (R = Et, i-Pr, 4-methylpentan-2-yl, etc.) were synthesized, followed by an evaluation of their antiplasmodial activity. Compounds I were synthesized by reacting 4-[[4-(7-chloroquinolin-4-yl)piperazin-1-yl]methyl]benzonitrile with appropriate primary amines RNH2. The synthesized compounds were investigated for inhibitory activity by the inhibition test of heme detoxification (ITHD). Their antiplasmodial activity was then evaluated using the classical 4-day suppressive test (Peter’s test) against Plasmodium berghei-infected mice (ANKA strain). The results showed that the percentage of heme detoxification inhibition in the active compounds was 90%. The most promising analogs, I (R = n-Bu, 4-methylpentan-2-yl), displayed 97.65 and 99.18% suppressions at the doses of 75 and 50 mg/kg/day, resp. Further, the mean survival time of the mice treated with these compounds was higher than that of the neg. control group. The newly synthesized amodiaquine analogs presented sufficient antiplasmodial activity with excellent suppressions and high in vitro heme detoxification inhibition. Higher mean survival time of the mice treated with the synthetic compounds further confirmed the in vivo antimalarial activity of these new AQ analogs. Therefore, I have the potential to replace common drugs from the 4-aminoquinoline class. However, further investigations such as pharmacokinetic evaluations, cytotoxicity, toxicity, and formulation are necessary.

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary

Recommanded Product: 837-52-5. 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: 7-Chloro-4-(piperazin-1-yl)quinoline, is researched, Molecular C13H14ClN3, CAS is 837-52-5, about Synthesis and evaluation of 7-chloro-4-(piperazin-1-yl)quinoline-sulfonamide as hybrid antiprotozoal agents. Author is Salahuddin, Attar; Inam, Afreen; van Zyl, Robyn L.; Heslop, Donovan C.; Chen, Chien-Teng; Avecilla, Fernando; Agarwal, Subhash M.; Azam, Amir.

A new series of 4-aminochloroquinoline based sulfonamides were synthesized and evaluated for antiamoebic and antimalarial activities. Out of the eleven compounds evaluated (F1-F11), two of them (F3 and F10) showed good activity against Entamoeba histolytica (IC50 <5 μM). Three of the compounds (F5, F7 and F8) also displayed antimalarial activity against the chloroquine-resistant (FCR-3) strain of Plasmodium falciparum with IC50 values of 2 μM. Compound F7, whose crystal structure was also determined, inhibited β-haematin formation more potently than quinine. To further understand the action of hybrid mols. F7 and F8, mol. docking was carried out against the homol. model of P. falciparum enzyme dihydropteroate synthase (PfDHPS). The complexes showed that the inhibitors place themselves nicely into the active site of the enzyme and exhibit interaction energy which is in accordance with our activity profile data. Application of Lipinski 'rule of five' on all the compounds (F1-F11) suggested high drug likeness of F7 and F8, similar to quinine. In addition to the literature in the link below, there is a lot of literature about this compound(7-Chloro-4-(piperazin-1-yl)quinoline)Recommanded Product: 837-52-5, illustrating the importance and wide applicability of this compound(837-52-5).

Reference:
Bromide – Wikipedia,
bromide – Wiktionary

Lou, Sha; Moquist, Philip N.; Schaus, Scott E. published the article 《Asymmetric Allylboration of Acyl Imines Catalyzed by Chiral Diols》. Keywords: asym allylboration acyl imine chiral diol catalysis.They researched the compound: (S)-3,3′-Dibromo-1,1′-bi-2-naphthol( cas:119707-74-3 ).Application of 119707-74-3. 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:119707-74-3) here.

Chiral BINOL-derived diols catalyze the enantioselective asym. allylboration of acyl imines. The reaction requires 15 mol % (S)-3,3′-Ph2-BINOL (the most effective catalyst) as the catalyst and allyldiisopropoxyborane as the nucleophile. The reaction products were obtained in good yields (75-94%) and high enantiomeric ratios (95:5-99.5:0.5) for aromatic and aliphatic imines, e.g. 87 % (99:1 enantiomer ratio) N-((R)-1-phenylbut-3-enyl)benzamide from diisopropyl allylboronate and N-(benzylidene)benzamide. High diastereoselectivities (diastereomeric ratio > 98:2) and enantioselectivities (enantiomeric ratio > 98:2) were obtained in the reactions of acyl imines with crotyldiisopropoxyboranes. This asym. transformation is directly applied to the synthesis of Maraviroc, the selective CCR5 antagonist with potent activity against HIV-1 infection. Mechanistic studies of the allylboration reaction including IR, NMR, and mass spectrometry studies indicate that acyclic boronates are activated by chiral diols via exchange of one of the boronate alkoxy groups with activation of the acyl imine via H bonding.

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary

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: 1001-26-9, is researched, Molecular C7H12O3, about Green synthesis of Levofloxacin, the main research direction is synthesis Levofloxacin ethyl ethoxyacrylate.Reference of Ethyl 3-Ethoxy-2-Propenoate.

New process for preparing Levofloxacin was described. The target was prepared from (2, 3, 4, 5)-fluorobenzoic chloride, which reacted with Et 3-ethoxyacrylate, amination with S-(+)-2-aminopropanol, cyclization, hydrolysis and condensation with N-Me piperazine. The total yield was 50.15%. The process has many advantages, such as simple operation, less environmental pollution. In line with the green chem. development direction, it deserves further research and popularization.

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary

Recommanded Product: 33216-52-3. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 3,4,5-Trichloropyridine, is researched, Molecular C5H2Cl3N, CAS is 33216-52-3, about Selective Dual Inhibitors of the Cancer-Related Deubiquitylating Proteases USP7 and USP47. Author is Weinstock, Joseph; Wu, Jian; Cao, Ping; Kingsbury, William D.; McDermott, Jeffrey L.; Kodrasov, Matthew P.; McKelvey, Devin M.; Suresh Kumar, K. G.; Goldenberg, Seth J.; Mattern, Michael R.; Nicholson, Benjamin.

Inhibitors of the cancer-related cysteine isopeptidase human ubiquitin-specific proteases 7 (USP7) and 47 (USP47) are considered to have potential as cancer therapeutics, owing to their ability to stabilize the tumor suppressor p53 and to decrease DNA polymerase β (Polβ), both of which are potential anticancer effects. A new class of dual small mol. inhibitors of these enzymes has been discovered. Compound 1 (I), a selective inhibitor of USP7 and USP47 with moderate potency, demonstrates inhibition of USP7 in cells and induces elevated p53 and apoptosis in cancer cell lines. Compound 1 has been shown to demonstrate modest activity in human xenograft multiple myeloma and B-cell leukemia in vivo models. This activity may be the result of dual inhibition of USP7 and USP47. To address issues regarding potency and developability, analogs of compound 1 have been synthesized and tested, leading to improvements in potency, solubility, and metabolic reactivity profile. Further optimization is expected to yield preclin. candidates and, ultimately, clin. candidates for the treatment of multiple myeloma, prostate cancer, and other cancers.

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Bromide – Wikipedia,
bromide – Wiktionary

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 Unraveling the synthesis of homoleptic [Ag(N,N-diaryl-NHC)2]Y (Y = BF4, PF6) complexes by ball-milling, published in 2016, which mentions a compound: 286014-53-7, Name is 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, Molecular C21H25BF4N2, Application of 286014-53-7.

A user-friendly and general mechanochem. method was developed to access rarely described NHC (N-heterocyclic carbene) silver(i) complexes featuring N,N-diarylimidazol(idin)ene ligands and non-coordinating tetrafluoroborate or hexafluorophosphate counter anions. Comparison with syntheses in solution clearly demonstrated the superiority of the ball-milling conditions.

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Bromide – Wikipedia,
bromide – Wiktionary

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 4,4-Dipyridyl Disulfide( cas:2645-22-9 ) is researched.Reference of 4,4-Dipyridyl Disulfide.Kanno, Takefumi; Nakabayashi, Koji; Imoto, Kenta; Ohkoshi, Shin-ichi published the article 《Manganese-Octacyanidoniobate-Based Ferrimagnet Possessing Bridging Ligands with Disulfide Bonds》 about this compound( cas:2645-22-9 ) in European Journal of Inorganic Chemistry. Keywords: manganese octacyanidoniobate ferrimagnet preparation crystal mol structure; cyanide bridging disulfide bond manganese octacyanidoniobate preparation. Let’s learn more about this compound (cas:2645-22-9).

Authors synthesized a cyanido-bridged Mn-Nb metal assembly possessing large-sized bridging ligands with disulfide bonds, [Mn(dpds)2]2[Nb(CN)8]·6H2O (MnNb, dpds: 4,4′-dipyridyl disulfide). MnNb has a three-dimensional coordination framework in which the Mn and Nb sites are bridged by cyanides, while the Mn sites are combined by dpds ligands. The two crystallog. independent dpds ligands are bent around the disulfide bond with large C(pyridine)-S-S-C(pyridine) dihedral angles of 105.4(5)° and 102.2(5)°, resp. For mol.-based magnets, dpds is a relatively large bridging ligand, but it is compatible with the limited space of the cyanido-bridged Mn-Nb coordination framework due to the bent structure. Addnl., antiferromagnetic coupling in MnNb of -13 cm-1 between MnII (S = 5/2, g = 2) and NbIV (S = 1/2, g = 2) induces ferrimagnetism with a critical temperature of 46 K.

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Bromide – Wikipedia,
bromide – Wiktionary

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Ethyl 3-Ethoxy-2-Propenoate, is researched, Molecular C7H12O3, CAS is 1001-26-9, about A One-Step Synthesis of 2,4-Unsubstituted Quinoline-3-carboxylic Acid Esters from o-Nitrobenzaldehydes, the main research direction is nitrobenzaldehyde diethoxypropionic acid ester modified reductive Friedlaender reaction tin; quinolinecarboxylic acid ester preparation; tin chloride modified reductive Friedlaender reaction mediator.Recommanded Product: 1001-26-9.

A straightforward and efficient one-step procedure for the synthesis of 2,4-unsubstituted quinoline-3-carboxylic acid Et esters, e.g., I (R1 = Me, Et; R2 = H, F, Cl, Br, OH), is described. The simple reductive cyclization is carried out by treating various substituted o-nitrobenzaldehydes with inexpensive, com. available 3,3-diethoxypropionic acid Et ester and SnCl2·2H2O in refluxing ethanol.

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary

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: 1001-26-9, is researched, Molecular C7H12O3, about 2-Oxabicyclo[2.1.1]hexane and 2-oxabicyclo[2.1.1]hex-5-yl derivatives, the main research direction is oxabicyclohexane derivative; oxabicyclohexanemethanol brosylate solvolysis; deamination oxabicyclohexylmethylamine; oxidation rearrangement oxabicyclohexanemethanol.Safety of Ethyl 3-Ethoxy-2-Propenoate.

2-Oxabicyclo[2.1.1]hexane (I) was obtained by cyclization of 3-hydroxycyclobutylmethanol while Et 2-oxabicyclo[2.1.1]hexane-endo-5-carboxylate (II) is accessible from Et 3-(2-propenyloxy)propenoate by intramol. photochem. cycloaddition Comparison of the 1H-NMR spectra of I and II confirms the endo configuration of the ethoxycarbonyl group. Thermolysis of II leads to Et 2-ethenyl-4-oxobutyrate. PCC oxidation of 2-oxabicyclo[2.1.1]hexane-endo-5-methanol (III) affords 2,7-dioxabicyclo[3.2.1]oct-3-ene (IV) by rearrangement of the expected aldehyde. Solvolyses of the brosylate derived from III, and nitrous acid deamination of the analogous amine proceed with competitive displacement and fragmentation. Fragmentation is enhanced by better leaving groups, elevated temperatures, and less nucleophilic solvents. Ring expansion, with formation of 2-oxanorbornyl cations, occurs to less than 1%, if at all.

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Reference:
Bromide – Wikipedia,
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