- Synthesis, experimental and theoretical study of novel 2-haloalkyl (-CF2H, -CCl2H, -CF2CF3)-, 3-bromo and bromomethyl substituted chromones
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A set of seven new chromones with 2-haloalkyl (-CF2H, -CCl2H, -CF2CF3) and 3-bromo and bromomethyl substituents were synthesized. The novel compounds were studied by DFT calculations and characterized by vibrational spectroscopy (IR and Raman) in solid state, and NMR (1H, 13C and 19F) and UV–vis spectroscopy in solution. The crystal structure of 3-dibromomethyl-2-difluoromethyl chromone was determined by X-ray diffraction. Due to extended π-bond delocalization, the organic framework is planar and lies on a crystallographic m-mirror plane. The intermolecular non-covalent interactions of 3-dibromomethyl-2-difluoromethyl chromone, as π?π stacking arrangements, F?H hydrogen bonds and O?Br contacts were evaluated by Hirshfeld surfaces analysis. These intermolecular contacts, which affect the absorption bands location of the involved groups, were also detected in the vibrational spectra.
- Narváez O, Ena G.,Bonilla V., Pablo M.,Zurita, Daniel A.,Alcívar L., Christian D.,Heredia-Moya, Jorge,Ulic, Sonia E.,Jios, Jorge L.,Piro, Oscar E.,Echeverría, Gustavo A.,Langer, Peter
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- 5-Chlorobenzofuran-2-carboxamides: From allosteric CB1 modulators to potential apoptotic antitumor agents
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Cannabinoids as THC and the CB1 allosteric modulator CBD were reported to have antiproliferative activities with no reports for other CB1 allosteric modulators as the 5-chloroindole-2-carboxamide derivatives and their furan congeners. Based on the antiproliferative activity of two 5-chlorobenzofuran-2-carboxamide allosteric CB1 modulators, a series of novel derivatives was designed and synthesized. The synthesized compounds were tested in a cell viability assay using human mammary gland epithelial cell line (MCF-10A) where all the compounds exhibited no cytotoxic effects and more than 85% cell viability at a concentration of 50 μM. Some derivatives showed good antiproliferative activities against tumor cells as compounds 8, 15, 21 and 22. The most active compound 15 showed equipotent activity to doxorubicin. Compounds 7, 9, 15, 16, 21 and 22 increased the level of active caspase 3 by 4–8 folds, compared to the control cells in MCF-7 cell line and doxorubicin as a reference drug. Compounds 15 and 21, the most activecaspase-3 inducers, increase the levels of caspase 8 and 9 indicating activation of both intrinsic and extrinsic pathways and showed potent induction of Bax, down-regulation of Bcl-2 protein levels and over-expression of Cytochrome C levels in MCF-7 cell lines. Compound 15 exhibited cell cycle arrest at the Pre-G1 and G2/M phases in the cell cycle analysis of MCF-7 cell line. The drug Likeness profile of the synthesized compounds showed that all the compounds were predicted to have high oral absorption complying with different pharmacokinetics filters.
- Youssif, Bahaa G.M.,Mohamed, Ashraf M.,Osman, Essam Eldin A.,Abou-Ghadir, Ola F.,Elnaggar, Dina H.,Abdelrahman, Mostafa H.,Treamblu, Laurent,Gomaa, Hesham A.M.
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- How much does the hybridization of a carbon atom affect the transmission of the substituent effect on the chemical shift?
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1H and 13C NMR spectra of aryl esters of propionic acid, acrylic acid, and propiolic acid were systematically examined to find out the substituent effect on the chemical shift. The values of the chemical shift of the carbonyl carbon showed an inverse correlation with the Hammett ?3 values, and the magnitude of the slope was the largest with the propiolates. The ?± carbons of acrylates and propiolates also showed an inverse correlation with much smaller values of the slopes than those of the carbonyl carbons; but those of the propionates showed absolutely no correlation. However, the ?2 carbons of acrylates and propiolates showed normal correlation with larger values of the slopes. The signs and the magnitudes of the slopes may be understood by the transmission of the substituent electronic effect through bonds as well as through space. The propiolyloxy group also showed a significantly large effect on the 13C chemical shift values of the benzene ring.
- Jeong, Eun Jeong,Lee, In-Sook Han
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p. 295 - 299
(2015/03/03)
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- Enzymatic resolution, desymmetrization, and dynamic kinetic asymmetric transformation of 1,3-cycloalkanediols
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An efficient desymmetrization of cis-1,3-cyclohexanediol to (1S,3R)-3-(acetoxy)-1-cyclohexanol ((R,S)-2a) was performed via Candida antarctica lipase B (CALB)-catalyzed transesterification, in high yield (up to 93%) and excellent enantioselectivity (ee's
- Fransson, Ann-Britt L.,Xu, Yongmei,Leijondahl, Karin,Baeckvall, Jan-E.
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p. 6309 - 6316
(2007/10/03)
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- Flavanonol derivatives and hair-nourishing, hair growing compositions containing the derivatives
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The present invention relates to flavanonol derivatives represented by formula (1): STR1 (wherein R1 represents an alkyl group, and each of R2 and R3 represents a hydrogen atom, an alkyl group which may have a substituent,
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- Synthesis and activity of 2-methyl-3-aminopropiophenones as centrally acting muscle relaxants
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Some novel 2-methyl-3-aminopropiophenones were synthesized and their centrally acting muscle relaxant activities were,evaluated for an inhibitory effect on the flexor reflex in rats. The structure-activity relationships are discussed. In this series 2-methyl-3-pyrrolidino-1-(4-trifluoromethylphenyl)-propan-1-one (28) showed significant centrally acting muscle relaxant activity. In addition, the activities of each enantiomer (28-(S) and (R)) were studied along with their acute toxicities. Compound 28-(R) was found to exhibit more potent activity and weaker acute toxicity than 28-(S). Accordingly, compound 28-(R) (NK433) is under development as a novel centrally acting muscle relaxant.
- Shiozawa,Narita,Izumi,Kurashige,Sakitama,Ishikawa
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- Studies in Bile Salt Solutions. XIV. Electronic, Charge and Steric Substrate-Effects on the Esterase Activity of Bile-Salt-Stimulated Human Milk Lipase. Hydrolysis of 4-Substituted Phenyl Propionates
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The rate constants of hydrolysis of series of 4-substituted phenyl propionates, catalysed by bile-salt-stimulated human milk lipase in the absence and presence of cholate or taurocholate stimulation, have been measured at pH 7.3, 310.5 K.There is little evidence for an alkyl site electronic interaction in the rate-determining step of the esterolytic reaction.However, a negatively charged substrate or an amido-substituent caused an inhibition of unstimulated esterase activity.In the presence of the bile-salt cofactors, esterolytic activity against charged substrates may be stimulated or inhibited, depending on the proximity of the charge to the steroidal side chain and the subsequent substrate-interaction within the surrounding environment of the active site.It has been confirmed that bile-salt-stimulated lipase is not an amidase, but that an amide, of the correct geometry, may occupy the active site and restrict esterase activity.
- O'Connor, Charmian J.,Mitha, Amin S. H.
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p. 259 - 269
(2007/10/02)
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