Day: February 8, 2021

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Novel potent 5-HT3 receptor ligands based on the pyrrolidone structure: Synthesis, biological evaluation, and computational rationalization of the ligand-receptor interaction modalities

Novel conformationally constrained derivatives of classical 5-HT3 receptor antagonists were designed and synthesized with the aim of probing the central 5-HT3 receptor recognition site in a systematic way. The newly-synthesized compounds were tested for their potential ability to inhibit [3H]granisetron specific binding to 5-HT3 receptor in rat cortical membranes. These studies revealed subnanomolar affinity in some of the compounds under study. The most potent ligand in this series was found to be quinuclidine derivative (S)-7i, which showed an affinity comparable with that of the reference ligand granisetron. The potential 5-HT3 agonist/antagonist activity of some selected compounds was assessed in vitro on the 5-HT3 receptor-dependent [14C]guanidinium uptake in NG 108-15 cells. Both of the tropane derivatives tested in this functional assay (7a and 9a) showed antagonist properties, while the quinuclidine derivatives studied [the enantiomers of compounds 7i, 8g, and 9g, and compound (R)-8h] showed a full range of intrinsic efficacies. Therefore, the functional behavior of these 5-HT3 receptor ligands appears to be affected by the structural features of both the azabicyclo moiety and the heteroaromatic portion. In agreement with the data obtained on NG 108-15 cells, investigations on the 5-HT3 receptor-dependent Bezold-Jarisch reflex in urethane-anaesthetized rats confirmed the 5-HT3 receptor antagonist properties of compounds 7a and (S)-7i showing for these compounds ID50 values of 2.8 and 181 mug/kg, respectively. Finally, compounds 7a, (S)-7i and 9a (at the doses of 0.01, 1.0, and 0.01 mg/kg ip, respectively) prevented scopolamine-induced amnesia in the mouse passive avoidance test suggestive of a potential usefulness in cognitive disorders for these compounds. Qualitative and quantitative structure-affinity relationship studies were carried out by means of theoretical descriptors derived on a single structure and ad-hoc defined size and shape descriptors (indirect approach). The results showed to be useful in capturing information relevant to ligand-receptor interaction. Additional information derived by the analysis of the energy minimized 3-D structures of the ligand-receptor complexes (direct approach) suggested interesting mechanistic and methodological considerations on the binding mode multiplicity at the 5-HT3 receptors and on the degree of tolerance allowed in the alignment of molecules for the indirect approach, respectively.

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Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H140N | ChemSpider

Chemistry is traditionally divided into organic and inorganic chemistry. Recommanded Product: 123536-14-1, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 123536-14-1

Optimized synthesis and solid state investigations on the drug candidate encenicline hydrochloride

For the production of drug substances a robust, scalable process delivering the active pharmaceutical ingredient (API) in excellent chemical and polymorphic purity is required. For this purpose we developed a novel imidazole-mediated one-pot procedure for the preparation of encenicline hydrochloride monohydrate, which crystallizes directly from the reaction mixture as pure non-hygroscopic polymorph (Form I). Solid state studies revealed a series of additional new physical forms for which crystal structures have been determined by single crystal X-ray diffraction.

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Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H149N | ChemSpider

Synthetic Route of 123536-14-1, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.123536-14-1, Name is (R)-3-Aminoquinuclidine dihydrochloride, molecular formula is C7H16Cl2N2. In a Article£¬once mentioned of 123536-14-1

Discovery of fused heterocyclic carboxamide derivatives as novel alpha7-nAChR agonists: Synthesis, preliminary SAR and biological evaluation

The alpha7 nicotinic acetylcholine receptor (alpha7 nAChR) has emerged as a promising therapeutic target for schizophrenia. In our previous work, a novel series of alpha7-nAChR agonists bearing scaffold of indolizine were discovered. To explore the effect of aromaticity on the activity and find more active agents, herein, fused heterocyclic carboxamide derivatives were designed and synthesized in this study. Based on the evaluation by two-electrode voltage clamp in Xenopus oocytes, 27 of the synthesized compounds showed obvious agonism of alpha7 nAChR. Particularly, compounds 10a and 10e showed significantly higher Emax than EVP-6124. The result illustrated the importance of aromaticity to the activity of agonism. Compound 10a, which showed EC50 of 1.88 muM and Emax of 72.4%, was further characterized comprehensively, including co-application with type II positive allosteric modulator PNU-120596, selectivity with other closely related ligand-gated ion channel, etc. The results showed that 10a showed moderate selectivity over other subtypes such as alpha4beta2 and alpha3beta4 nAChR. 10a evoked alpha7-like currents that were inhibited by MLA and enhanced in the presence of the alpha7 PAM PNU-120596. The analysis of binding mode and understanding of structure-activity relationship provided insights to develop more potent novel alpha7-nAChR agonists.

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Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H158N | ChemSpider

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 123536-14-1, C7H16Cl2N2. A document type is Patent, introducing its new discovery., HPLC of Formula: C7H16Cl2N2

Quinuclidine-substituted hetero-bicyclic aromatic compounds for the treatment of disease

The invention provides compounds of Formula I: 1wherein W0 is a bicyclic moiety and is 2These compounds may be in the form of pharmaceutical salts or compositions, may be in pure enantiomeric form or racemic mixtures, and are useful to treat diseases or conditions in which alpha7 is known to be involved.

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Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H98N | ChemSpider

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 827-61-2, C9H15NO2. A document type is Article, introducing its new discovery., Recommanded Product: Quinuclidin-3-yl acetate

95. Inductive Charge Dispersal in Quinuclidinium Ions. Polar Effects, Part 13

Inductive charge dispersal to the alpha-, beta-, and gamma-positions of the solvated quinuclidinium ion has been examined by comparing the pKa and the derived inductivities rho1 of several 2-, 3- and 4-substituted quinuclidinium perchlorates 4, 5, and 6, respectively.The same inductivity is observed at the practically equidistant beta- and gamma-positions.It, therefore, appears that polar substituent effects are transmitted directly through the molecule.As expected, inductivity is considerably higher at the alpha-positions where through-bond and direct induction coincide.The fact that the pKa of all three series of salts correlate linearly with each other points to the common nature of these inductive electron displacements.

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Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H59N | ChemSpider

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 123536-14-1, C7H16Cl2N2. A document type is Patent, introducing its new discovery., Formula: C7H16Cl2N2

Compounds

Compounds of formula I: 1 wherein A, D, Ar1, E and Ar2 are as defined in the specification, processes for preparing them, pharmaceutical compositions containing them and their use in therapy, especially in the treatment or prophylaxis of psychotic and intellectual impairment disorders.

Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. I hope my blog about is helpful to your research. Formula: C7H16Cl2N2

Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H101N | ChemSpider

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 123536-14-1, C7H16Cl2N2. A document type is Article, introducing its new discovery., Recommanded Product: (R)-3-Aminoquinuclidine dihydrochloride

Synthesis, crystal structures, second harmonic generation response and temperature phase transitions of two noncentrosymmetric Cu(II)-hybrid halides compounds: [(R)-C7H16N2][CuX4] (X = Cl or Br)

(R)-(+)-3-aminoquinuclidine was used in the synthesis of [(R)-C7H16N2][CuCl4] (1) and [(R)-C7H16N2][CuBr4] (2), which both contain similar [CuX4]2- anions (X = Cl or Br). The structures of the two compounds were determined using single-crystal X-ray diffraction. The use of enantiomerically pure sources of (R)-C7H14N2 forces crystallographic noncentrosymmetry. These materials crystallize in the chiral space group P212121 (No. 19), which exhibits the enantiomorphic crystal class 222 (D2). In the molecular arrangement, the [CuX4]2- anions are linked to the organic cations through N?H ? X and C?H ? X hydrogen bonds to form cation-anion-cation molecular units, which are held together by means of offset face-to-face interactions giving a three-dimensional network. Thermal stability of the crystals was ascertained by TG measurement. Compounds (1) and (2) display several phases transition with higher transition temperature at T = 100 C. The Kurtz and Perry powder method using Nd:YAG laser shows that their second harmonic generation (SHG) efficiencies are about 0.81 and 0.82 times as large as that of KH2PO4 (KDP), respectively. Such a chiral hybrid metal halides skeleton could provide a new platform for future engineering in the areas including information storage, light modulators and optoelectronic functionalities.

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Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H145N | ChemSpider

827-61-2, Name is Quinuclidin-3-yl acetate, belongs to quinuclidine compound, is a common compound. Formula: C9H15NO2In an article, once mentioned the new application about 827-61-2.

Pharmacological strategies for presbyopia correction

Purpose: To summarize the pharmacological strategies that are being explored for presbyopia correction. Methods: The review concentrates on pharmacologically induced pupillary miosis to increase depth-of-focus and lens softening or other measures to restore active accommodation. Results: Several studies suggest that near vision improves and distance vision is unaffected for many hours after either monocular or binocular instillation of any one of several drug combinations that cause miosis. Unfortunately, in most studies, measurements were limited to photopic visual acuity for near and distance vision, whereas it is anticipated that pupil constriction may have adverse effects on mesopic and scotopic vision. It is not clear whether improved near vision was due entirely to increased depth-of-focus, or whether, for example, a drug-induced myopic shift in refraction was also involved. Currently, no study has provided direct evidence for drug-induced restoration/enhancement of true accommodation involving an ocular power change. Conclusions: Although it is possible that, in the future, pharmacological drops may offer a safe and reliable solution for presbyopia correction, more evidence of their effectiveness and limitations is required.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Formula: C9H15NO2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about Formula: C9H15NO2, in my other articles.

Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H74N | ChemSpider

827-61-2, Name is Quinuclidin-3-yl acetate, belongs to quinuclidine compound, is a common compound. Formula: C9H15NO2In an article, once mentioned the new application about 827-61-2.

In vitro muscarinic activity of spiromuscarones and related analogs

The cholinergic hypothesis of Alzheimer’s disease suggests that cholinergic agonists may have therapeutic potential for treating the attendant memory deficits of the disease. As part of a program aimed at preparing metabolically stable, nonquaternary analogs of muscarone, 1-oxa- 2,8-dimethyl-8-azaspiro[4.5]decan-3-one, 2a, and related analogs have been synthesized and their in vitro muscarinic activity evaluated. The synthetic strategy in the formation of the 1-spiro[4.5]decan-3-one ring system of 2a involved cyclization of the diol 4 in the presence of Nafion-Hg. The spiromuscarone 2a was found to displace [3H]Oxo-M binding with a K(i) value of 7 nM. Affinities of the oxime and hydrazone analogs of 2a were lower than 2a. The compounds in these series were partial muscarinic agonists as demonstrated by stimulation of phosphatidyl inositol hydrolysis assay, with 2a showing the highest intrinsic activity (60% as compared with carbachol). The results from this study indicate that an exo double bond at the C-3 position is essential for the receptor binding.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about Formula: C9H15NO2 is helpful to your research. Formula: C9H15NO2

Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H90N | ChemSpider

67496-78-0, Name is Quinuclidin-4-ylmethanamine, belongs to quinuclidine compound, is a common compound. Quality Control of Quinuclidin-4-ylmethanamineIn an article, once mentioned the new application about 67496-78-0.

CEPHALOSPORIN HAVING CATECHOL GROUP

The present invention provides Cephem compounds which have a wide antimicrobial spectrum and have potent antimicrobial activity against beta-lactamase producing Gram negative bacteria as follows: A compound of the formula: wherein, X is N, CH or C-Cl; T is S or the like; A and G are lower alkylene or the like; B is a single bond or the like; D is a single bond, -NR7-, -CO-, -CO-NR7-, -NR7-CO-, -NR7-CO-NR7-, or the like; E is optionally substituted lower alkylene; F is a single bond or optionally substituted phenylene; R3, R4, R5 and R6 each is independently hydrogen, halogene, nitrile, or the like; or an ester, a compound protected at the amino on the ring in the 7-side chain, a pharmaceutically acceptable salt, or a solvate thereof.

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Reference£º
Quinuclidine – Wikipedia,
Quinuclidine | C7H22N | ChemSpider