Synthesis, Pharmacological Characterization, and Docking Analysis of a Novel Family of Diarylisoxazoles as Highly Selective Cyclooxygenase-1 (COX-1) Inhibitors
摘要:
3-(5-Chlorofuran-2-yl)-5-methyl-4-phenylisoxazole (P6), a known selective cyclooxygenase-1 (COX-1) inhibitor, was used to design a new series of 3,4-diarylisoxazoles in order to improve its biochemical COX-1 selectivity and antiplatelet efficacy. Structure activity relationships were studied using human whole blood assays for COX-1 and COX-2 inhibition in vitro, and results showed that the simultaneous presence of S-methyl (or -CF3), 4-phenyl, and 5-chloro(-bromo or -methyl)furan-2-yl groups on the isoxazole core was essential for their selectivity toward COX-1. 3g, 3s, 3d were potent and selective COX-1 inhibitors that affected platelet aggregation in vitro through the inhibition of COX-1-dependent thromboxane (TX) A(2). Moreover, we characterized their kinetics of COX-1 inhibition. 3g, 3s, and 3d were more potent inhibitors of platelet COX-1 and aggregation than P6 (named 6) for their tighter binding to the enzyme. The pharmacological results were supported by docking simulations. The oral administration of 3d to mice translated into preferential inhibition of platelet-derived TXA(2) over protective vascular-derived prostac-yclin (PGI(2)).
Synthesis of isoxazole-containing sulfonamides with potent carbonic anhydrase II and VII inhibitory properties
作者:Cevher Altug、Hanife Güneş、Alessio Nocentini、Simona Maria Monti、Martina Buonanno、Claudiu T. Supuran
DOI:10.1016/j.bmc.2017.01.008
日期:2017.2
obtain 5-amidoisoxazoles. The novel compounds were screened in vitro as inhibitors of four human (h) isoforms of the metalloenzyme carbonicanhydrase (CA, EC 4.2.1.1): hCA I, hCA II, hCA IV and hCA VII. The derivatives of the first series were shown to possess excellent inhibitory activity against the cytosolic isoform hCA II, an antiglaucoma drug target, with KIs in the range of 0.5-49.3nM and hCA VII,
The asymmetric reduction of β-keto-γ-acetal enamides has been investigated. A wide range of enantioenriched β-hydroxy-γ-acetal enamides were obtained through asymmetric transfer hydrogenation catalyzed by a tethered Rh(III)-DPEN complex with yields up to quantitative and enantioselectivities up to 99%. The reaction proved to be highly chemoselective toward the reduction of the carbonyl group over the
Design, synthesis and evaluation of novel levoglucosenone derivatives as promising anticancer agents
作者:Yi-hsuan Tsai、Carla M. Borini Etichetti、Soledad Cicetti、Javier E. Girardini、Rolando A. Spanevello、Alejandra G. Suárez、Ariel M. Sarotti
DOI:10.1016/j.bmcl.2020.127247
日期:2020.7
and anhydropyranose cores have been designed and synthesized following an hetero Michael // 1,3-dipolar cycloaddition path. The use of a design of experiments approach allowed the optimization of the oxa-Michael reaction with propargyl alcohol as nucleophile, a key step for the synthesis of the target compounds. All of the compounds were tested for their anticancer activity on MDA-MB-231 cells, featuring
Direct access to 1,4-benzothiazine 4,4-dioxides and 4-oxides via a domino reaction
作者:Özge Kavas、Cevher Altug
DOI:10.1016/j.tet.2017.03.056
日期:2017.5
The domino reactions of 2-fluoro benzensulfonyl acetonitrile and α-chloro oximes in the presence of Cs2CO3 in aprotic high boiling point solvents have been achieved to provide isoxazole−fused 4H-1,4-benzothiazine-4,4-dioxides via an unprecedented transition metal-free one-pot addition/cyclization process. The tunable synthesis of either isoxozolo-1,4-benzothiazin-4-oxides or their precursor 5-aminoisoxazoles
在质子惰性高沸点溶剂中,在Cs 2 CO 3存在下,2-氟苯磺酰基乙腈和α-氯肟的多米诺反应可提供异恶唑稠合的4 H -1,4-苯并噻嗪-4,4-二氧化物通过史无前例的无过渡金属一锅添加/环化工艺。可以根据溶剂选择来控制异氧唑啉-1,4-苯并噻嗪-4-氧化物或其前体5-氨基异恶唑的可调合成。所观察到的产物通过(IR,1 H,13 C NMR和HRMS)和物理方法表征。