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    Crystal structure of 3,4a, 7,7,10a-pentamethyl-3-vinyldodecahydro-1H-benzo[f]chromen-9-ol isolated from Sideritis perfoliata
    (INT UNION CRYSTALLOGRAPHY, 2016) Celik, Ismail; Ersanli, Cem Cuneyt; Koseoglu, Rahmi; Aksit, Huseyin; Erenler, Ramazan; Demirtas, Ibrahim; Akkurt, Mehmet
    The asymmetric unit of the title compound, C20H34O2, contains two crystallographically independent molecules (1 and 2) with similar conformations. In both molecules, the cyclohexane rings adopt a chair conformation, while the oxane rings are also puckered. In the crystal, O-H center dot center dot center dot O hydrogen bonds connect adjacent molecules, forming C(6) helical chains located around a 21 screw axis and running along the crystallographic a axis. The packing of these chains is governed only by van der Waals interactions. Semi-empirical PM3 quantum chemical calculations are in a satisfactory agreement with the structural results of the X-ray structure analysis. The absolute structure was indeterminate in the present experiment.
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    Crystal structure of racemic [(1R,2S,3R,4S,6S)-2,6-bis(furan-2-yl)-4-hydroxy-4-(thiophen-2-yl)cyclohexane-1,3-diyl]bis(thiophen-2-ylmethanone)
    (INT UNION CRYSTALLOGRAPHY, 2016) Celik, Ismail; Ersanli, Cem Cuneyt; Akkurt, Mehmet; Gezegen, Hayrettin; Koseoglu, Rahmi
    In the title compound, C28H22O5S3, the central cyclohexane ring adopts a chair conformation. The atoms of the furan ring attached to the 6-position of the central cyclohexane ring are disordered over two sets of sites with occupancies of 0.832 (5) and 0.168 (5). The hydroxy group is disordered over two positions (at the 4- and 6-positions of the cyclohexane ring) in the ratio 0.832 (5): 0.168 (5). In the crystal, molecules are linked by C-H center dot center dot center dot O hydrogen bonds and C-H center dot center dot center dot pi interactions, forming layers parallel to (100).
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    Crystal structure of racemic [(1R,2S,3R,4S,6S)-2,6-bis(furan-2-yl)-4-hydroxy-4-(thiophen-2-yl)cyclohexane-1,3-diyl]bis(thiophen-2-ylmethanone) (vol E72, pg 976, 2016)
    (INT UNION CRYSTALLOGRAPHY, 2016) Celik, Ismail; Ersanli, Cem Cuneyt; Akkurt, Mehmet; Gezegen, Hayreddin; Koseoglu, Rahmi
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    Novel piperazine and morpholine substituted quinolines: Selective synthesis through activation of 3,6,8-tribromoquinoline, characterization and their some metabolic enzymes inhibition potentials
    (Elsevier, 2020) Cakmak, Osman; Okten, Salih; Alimli, Dilek; Ersanli, Cem Cuneyt; Taslimi, Parham; Kocyigit, Umit Muhammet
    Regioselective routes are described for convenient preparation of novel piperazine/morpholine substituted quinoline derivatives at C-3, C-6 and C-8 starting with 3,6,8-tribromoquinoline (6) by nucleophilic substitution via conventional heating or microwave assisted reaction conditions. 3,6,8-Tribromoquinoline (6) was treated with piperazine and morpholine under microvawe irradiation, which selectively furnished 3-mopholinyl and 3-piperazinyl quinoline derivatives 7 and 8 in yields of 58% and 60%, respectively. On the other hand, the activation of benzene cycle of quinoline by nitration of 3,6,8-tribromoquinoline, giving 5-nitro-3,6,8-tribromoquinoline (18) in quantitative yield, was enabled. Then, the bromines at C-6 and C-8 were selectively exchanged by morpholine and piperazine via SNAr reactions. Thus, 6,8-dimopholinylquinoline (22) and 5-nitro-6,8-dipiperazinylquinoline (24), biologically valuable derivatives, were prepared in high yields (82% and 72%, respectively). The synthesized compounds were fully characterizated by H-1 NMR, C-13 NMR, 2D NMR, XRD, HRMS and IR spectra. The novel molecules had effective inhibition profiles against some metabolic enzymes. Also, they have the potential of drug candidates to treat of some diseases including glaucoma, epilepsy, Alzheimer's disease (AD), leukemia, and type-2 diabetes mellitus (T2DM). (C) 2020 Elsevier B.V. All rights reserved.
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    Synthesis, Crystal Structure and Theoretical Characterization of (3R, 4R, 6S)-3,6-Dihydroxy-1-Menthene Isolated from Echinophora Tenuifolia
    (GAZI UNIV, 2016) Celik, Ismail; Ersanli, Cem Cuneyt; Akkurt, Mehmet; Aksit, Huseyin; Erenler, Ramazan
    In the title compound, C10H18O2, the cyclohexene ring adopts a half-chair conformation. In the crystal strcuture, weak inter(sic)molecular O-H center dot center dot center dot O hydrogen bonds connect the adjacent molecules, forming edge-fused R23(8) ring motifs, into the hollow columns parallel to the b-axis direction. The crystal packing is governed only by van der Waals inter(sic)actions. There is no further C-H center dot center dot center dot pi and pi-pi interactions. The H atom in one of two hydroxyl groups was found to be disordered over two sites. The occupancy factors of the two sites were refined to 0.52 (2) and 0.48 (2). Semi-empirical PM3 quantum chemical calculations are in satisfactory agreement with the results of the X-ray structure analysis.