- Monocarbonyl Analogs of Curcumin based on the pseudopelletierine scaffold: Synthesis and anti-inflammatory activity
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Curcumin (CUR) is a natural compound that exhibits anti-inflammatory, anti-bacterial, and other biological properties. However, its application as an effective drug is problematic due to its poor oral bioavailability, solubility in water, and poor absorption from the gastrointestinal tract. The aim of this work is to synthesize monocarbonyl analogs of CUR based on the 9-methyl-9-azabicyclo[3.2.1]nonan-3-one (pseudopelletierine, granatanone) scaffold to improve its bioavailability. Granatane is a homologue of tropane, whose structure is present in numerous naturally occurring alkaloids, e.g., l-cocaine and l-scopolamine. In this study, ten new pseudopelletierine-derived monocarbonyl analogs of CUR were successfully synthesized and characterized by spectral methods and X-ray crystallography. Additionally, in vitro test of the cytotoxicity and anti-inflammatory properties of the synthesized compounds were performed.
- Brzezinski, Krzysztof,Eljaszewicz, Andrzej,Gandusekar, Ramesh,Ksiezak, Sylwia,Lazny, Ryszard,Moniuszko, Marcin,Pawelski, Damian,Plonska-Brzezinska, Marta E.,Radziwon, Piotr,Sredzinski, Dariusz,Walewska, Alicja
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- Preparation method of granisetron intermediate
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The invention discloses a preparation method of a granisetron intermediate. The preparation method comprises the following steps: step 1, carrying out a Mannich reaction on acetone dicarboxylic acid represented by a formula III to obtain pseudopelletierine represented by a formula IV; step 2, carrying out a reaction on the pseudopelletierine and hydroxylamine to prepare 3-pseudopelletierine oximerepresented by a formula V; and step 3, carrying out preparation by adopting one of the following schemes: (1) carrying out catalytic reduction on the 3-pseudopelletierine oxime through sodium bis(2-methoxyethoxy)aluminumhydride and Lewis acid to obtain a crude product of endo-3-amine-9-methyl-9-azabicyclo[3,3,1]nonane represented by a formula I, and directly using the crude product of endo-3-amine-9-methyl-9-azabicyclo[3,3,1]nonane to prepare granisetron, or purifying the crude product of endo-3-amine-9-methyl-9-azabicyclo[3,3,1]nonane for preparing granisetron; and (2) carrying out catalytichydrogenation reduction on the 3-pseudopelletierine oxime through Raney nickel to obtain a mixture of endo-3-amine-9-methyl-9-azabicyclo[3,3,1]nonane, purifying the mixture to obtain endo-3-amine-9-methyl-9-azabicyclo[3,3,1]nonane represented by the formula I, and using the endo-3-amine-9-methyl-9-azabicyclo[3,3,1]nonane used for preparing granisetron. The method has the advantages of mild reaction conditions, high reaction yield and low cost, and is suitable for industrial production.
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Paragraph 0025
(2020/02/27)
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- Toward biophysical probes for the 5-HT3 receptor: Structure-activity relationship study of granisetron derivatives
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This report describes the synthesis and biological characterization of novel granisetron derivatives that are antagonists of the human serotonin (5-HT3A) receptor. Some of these substituted granisetron derivatives showed low nanomolar binding affinity and allowed the identification of positions on the granisetron core that might be used as attachment points for biophysical tags. A BODIPY fluorophore was appended to one such position and specifically bound to 5-HT3A receptors in mammalian cells.
- Vernekar, Sanjeev Kumar V.,Hallaq, Hasan Y.,Clarkson, Guy,Thompson, Andrew J.,Silvestr, Linda,Lummis, Sarah C. R.,Lochner, Martin
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supporting information; experimental part
p. 2324 - 2328
(2010/07/17)
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- BICYCLONONENE DERIVATIVES
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The invention relates to novel bicyclononene derivatives and the use thereof as active ingredients in the preparation of pharmaceutical compositions. The invention also concerns related aspects including processes for the preparation of the compounds, pharmaceutical compositions containing one or more of those compounds and especially their use as inhibitors of renin.
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Page/Page column 23
(2010/10/20)
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- BICYCLIC FIVE-MEMBERED HETEROARYL DERIVATIVES AND THEIR USE AS RENIN INHIBITORS
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The invention relates to novel five-membered heteroaryl derivatives and the use thereof as active ingredients in the preparation of pharmaceutical compositions. The invention also concerns related aspects including processes for the preparation of the compounds, pharmaceutical compositions comprising one or more of those compounds and especially their use as inhibitors of renin.
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Page/Page column 28
(2010/11/23)
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- Iodine(V) reagents in organic synthesis. Part 4. o-Iodoxybenzoic acid as a chemospecific tool for single electron transfer-based oxidation processes
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o-Iodoxybenzoic acid (IBX), a readily available hypervalent iodine(V) reagent, was found to be highly effective in carrying out oxidations adjacent to carbonyl functionalities (to form α, β-unsaturated carbonyl compounds) and at benzylic and related carbon centers (to form conjugated aromatic carbonyl systems). Mechanistic investigations led to the conclusion that these new reactions are initiated by single electron transfer (SET) from the substrate to IBX to form a radical cation which reacts further to give the final products. Fine-tuning of the reaction conditions allowed remarkably selective transformations within multifunctional substrates, elevating the status of this reagent to that of a highly useful and chemoselective oxidant.
- Nicolaou,Montagnon,Baran,Zhong
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p. 2245 - 2258
(2007/10/03)
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- Guest/host relationships in the synthesis of the novel cage-based zeolites SSZ-35, SSZ-36, and SSZ-39
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Here, we report the synthesis and structure of three high-silica molecular sieves, SSZ-35, SSZ-36, and SSZ-39, that are prepared from a library of 37 different cyclic and polycyclic quaternized amine molecules that are used as structure-directing agents (SDAs). The size and shape of the quaternized amine molecules are purposely designed in order to obtain novel zeolite structures, and the synthesis of these molecules is presented. The selectivity for the three molecular sieve phases is found to depend on both the SDA and the degree of heteroatom lattice substitution of Al3+ or B3+ in the silicate framework. Molecular modeling is utilized to probe the effects of the nonbonded SDA/zeolite-framework interaction energy on the selectivity for the observed molecular sieve phase. The Rietveld refinement of the powder X-ray data confirms the structure of the SSZ-39 zeolite to be isomorphous with the aluminophosphate molecular sieve, SAPO-18 (AEI). The structure of SSZ-36 is found to possess a range of fault probabilities between the two-dimensional channel system, end-member polymorphs, ITQ-3 and RUB-13 (International Zeolite Association Codes ITE and RTH, respectively). The SSZ-35 structure is reported to contain a one-dimensional pore system possessing stacked cages circumscribed by alternating rings of 10 and 18 tetrahedral atoms (10- and 18-membered rings).
- Wagner, Paul,Nakagawa, Yumi,Lee, Greg S.,Davis, Mark E.,Elomari, Saleh,Medrud, Ronald C.,Zones
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p. 263 - 273
(2007/10/03)
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- Metabolism of N-alkyldiamines and N-alkylnortropinones by transformed root cultures of Nicotiana and Brugmansia
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A range of analogues of N-methylputrescine and tropinone were fed to transformed root cultures of Nicotiana rustica and/or a Brugmansia candida x aurea hybrid. These cultures were made by the transformation of the relevant plant species with Agrobacterium rhizogenes. A number of the metabolites, notably those showing a relatively modest alteration in the N-alkyl substituent, were metabolized in vivo to form homologues of the normal alkaloids biosynthesized by these roots. These products were identified by GC/MS and comparison with some synthetic reference materials. Analogues with major alterations in the size of the N-alkyl substituent were not metabolized at all. In the N. rustica cultures, the analogues fed at 1 mM significantly affected the profile of normal alkaloids, with up to a 4-fold diminution in nicotine being found in the presence of N-n-propylputrescine. The ratio between alkaloids of the pyrrolidine series and the piperideine series was also affected. In contrast, the presence of the analogues in the B. candida x aurea hybrid culture at 1 mM did not inhibit or substantially interfere with the accumulation of the normal spectrum of alkaloids. The potential for using these cultures to make complex novel products from simple precursors is discussed.
- Boswell, Henry D.,Draeger, Birgit,Eagles, John,McClintock, Carol,Parr, Adrian,Portsteffen, Andreas,Robins, David J.,Robins, Richard J.,Walton, Nicholas J.,Wong, Chi
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p. 855 - 869
(2007/10/03)
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- SYMMETRIE-ENHANCED REMOTE DICARBANION ANNULATIONS FOR LATENT CYCLOALKENONES: APPLICATION TO ALKALOIDS AND TERPENES
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Fuctionalized 1,n-dicarbanions (n = 4,5,6) react with α,α'-methallyl dihalides to produce n+3 substituted α-methylenecycloalkanes that are synthetic equivalents of two differentiable cycloalkenones.
- Lansbury, Peter T.,Spagnuolo, Ciro J.,Grimm, Erich L.
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p. 3965 - 3968
(2007/10/02)
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