Category: bromides-buliding-blocks

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

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

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

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,
bromide – Wiktionary

Benyei, A. C.; Stirling, A.; Bostai, B.; Lorincz, K.; Kotschy, A. published an article about the compound: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate( cas:286014-53-7,SMILESS:CC1=C([N+]2=CN(C3=C(C)C=C(C)C=C3C)C=C2)C(C)=CC(C)=C1.F[B-](F)(F)F ).Formula: C21H25BF4N2. 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:286014-53-7) through the article.

Detailed structural and computational investigations have been carried out to elucidate the unprecedented structural properties of NHC-derived tetrazinones. The provocative structural contradictions featured by this class of mols. as emerged from single crystal X-ray diffraction studies include the non-coplanar core ring system with an inter-ring C-C single bond indicating aromaticity but a pattern of bond alteration consistent with an overall quinoidal structure. Combination of periodic and gas-phase calculations identified two key factors affecting the overall structure. The first is a strong tendency to avoid cross-conjugation resulting in a coupled aromatic-quinoidal system whereas the second is the steric demand of the substituents determining the conformational behavior of the rings. The peculiar electron distribution yields remarkably large polarizations and dipole moments for these mols. which can be key in their potential applications.

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary

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: (S)-3,3′-Dibromo-1,1′-bi-2-naphthol, is researched, Molecular C20H12Br2O2, CAS is 119707-74-3, about Asymmetric Syntheses of the Flavonoid Diels-Alder Natural Products Sanggenons C and O.Product Details of 119707-74-3.

Metal-catalyzed, double Claisen rearrangement of a bis-allyloxyflavone has been utilized to enable a concise synthesis of the hydrobenzofuro[3,2-b]chromenone core structure of the natural products sanggenon A (I) and sanggenol F (II). In addition, catalytic, enantioselective [4+2] cycloadditions of 2′-hydroxychalcones have been accomplished using B(OPh)3/BINOL complexes. Asym. syntheses of the flavonoid Diels-Alder natural products sanggenons C (III) and O (IV) have been achieved employing a stereodivergent reaction of a racemic mixture (stereodivergent RRM) involving [4+2] cycloaddition

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 3,4,5-Trichloropyridine, is researched, Molecular C5H2Cl3N, CAS is 33216-52-3, about Discovery of Potent, Orally Bioavailable, Small-Molecule Inhibitors of WNT Signaling from a Cell-Based Pathway Screen, the main research direction is trisubstituted pyridine preparation bioavailability WNT signaling inhibitor antitumor.Application In Synthesis of 3,4,5-Trichloropyridine.

WNT signaling is frequently deregulated in malignancy, particularly in colon cancer, and plays a key role in the generation and maintenance of cancer stem cells. The authors report the discovery and optimization of a 3,4,5-trisubstituted pyridine, 1-(3,5-Dichloropyridin-4-yl)piperidine-4-carboxamide (9), using a high-throughput cell-based reporter assay of WNT pathway activity. The authors demonstrate a twisted conformation about the pyridine-piperidine bond of (9) by small-mol. x-ray crystallog. Medicinal chem. optimization to maintain this twisted conformation, cognisant of physicochem. properties likely to maintain good cell permeability, led to 8-[3-Chloro-5-[4-(1-methyl-1H-pyrazol-4-yl)phenyl]pyridin-4-yl]-2,8-diazaspiro[4,5]decan-1-one (74) (CCT251545), a potent small-mol. inhibitor of WNT signaling with good oral pharmacokinetics. The authors demonstrate inhibition of WNT pathway activity in a solid human tumor xenograft model with evidence for tumor growth inhibition following oral dosing. This work provides a successful example of hypothesis-driven medicinal chem. optimization from a singleton hit against a cell-based pathway assay without knowledge of the biochem. target.

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis of stilbene derivatives via the Suzuki-Miyaura reaction catalyzed by palladium N-heterocyclic carbene complexes, published in 2006-09-01, which mentions a compound: 286014-53-7, mainly applied to stilbenoid preparation Suzuki Miyaura reaction palladium heterocyclic carbene catalyst; stilbene preparation Suzuki Miyaura coupling palladium heterocyclic carbene catalyst; aryl halide boronic acid homogeneous catalysis imidazolium palladium coupling, Application of 286014-53-7.

The Suzuki-Miyaura reaction of aryl halides with trans-(2-phenylvinyl)boronic acid using a series of related in situ generated N-heterocyclic carbene palladium(II) complexes was studied in order to evaluate the effect of ligand structure and electronics on the catalytic activity and to investigate the nature of the catalyst species. The nature of the substituents of the carbene ligand was found to be critical Specifically, the presence of alkyl groups on the ortho positions of the Ph substituents was a requisite for obtaining the most efficient catalyst systems.

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Reference:
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 4-Aminoquinoline-ferrocenyl-chalcone conjugates: Synthesis and anti-plasmodial evaluation, published in 2017-01-05, which mentions a compound: 837-52-5, Name is 7-Chloro-4-(piperazin-1-yl)quinoline, Molecular C13H14ClN3, SDS of cas: 837-52-5.

A series of aliphatic and aromatic substituted 1H-1,2,3-triazole-tethered 4-amino-quinoline-ferrocenylchalcone conjugates has been synthesized and evaluated for anti-plasmodial activity. The conjugates with flexible aliphatic (aminoethanol or aminopropanol) substituents on the quinoline ring showed better anti-plasmodial activities compared to those with cyclic (piperazine or aminophenol) substituents. The conjugate FcCH:CHCOC6H4O(CH2)5[C2HN3-4]CH2O(CH2)3-4-NH-7-ClQ (17j, FcH = ferrocene, C2H3N3 = 1,2,3-triazole, H2Q = quinoline) was the most potent and non-cytotoxic, with an IC50 value of 0.37 μM against the chloroquine-resistant W2 strain of Plasmodium falciparum.

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: (S)-3,3′-Dibromo-1,1′-bi-2-naphthol, is researched, Molecular C20H12Br2O2, CAS is 119707-74-3, about Catalytic Asymmetric Allylboration of Indoles and Dihydroisoquinolines with Allylboronic Acids: Stereodivergent Synthesis of up to Three Contiguous Stereocenters, the main research direction is indole dihydroisoquinoline asym allylboration allylboronic acid stereoselectivity BINOL catalyst; allylboration; asymmetric catalysis; indoles; organocatalysis; stereoselectivity.Application of 119707-74-3.

The catalytic asym. allylboration of cyclic imines with γ,γ-disubstituted allylboronic acids provides products with adjacent stereocenters in high yield and stereoselectivity. Various electrophiles, including 3,4-dihydroisoquinolines and indoles, were prenylated in a fully stereodivergent fashion by switching the E/Z geometry of the allylboronate and/or the enantiomer of the BINOL catalyst. 3-Methylindole provided products with three adjacent stereocenters with high stereoselectivity in one synthetic operation.

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Reference:
Bromide – Wikipedia,
bromide – Wiktionary