Reinvestigation of structure–activity relationship of methoxylated chalcones as antimalarials: Synthesis and evaluation of 2,4,5-trimethoxy substituted patterns as lead candidates derived from abundantly available natural β-asarone
causes a decrease. In particular, 2,4,5-trimethoxy substitution pattern at ring A provided potent analogues which were easily derivedfrom abundantly available natural β-asarone rich Acorus calamus oil. Cytotoxic evaluation indicated that the most active compounds 27 (IC50: 1.8 μM) and 26 (IC50: 2 μM) were also relatively non-toxic. Furthermore, compound 12 showed excellent resistance index of 1.1 against
Synthesis and carbonic anhydrase inhibitory activities of new thienyl-substituted pyrazoline benzenesulfonamides
作者:Ebru Mete、Birnur Comez、Halise Inci Gul、Ilhami Gulcin、Claudiu T. Supuran
DOI:10.1080/14756366.2016.1181627
日期:2016.11.2
new thienyl-substituted pyrazoline benzenesulfonamides were synthesized and their carbonicanhydrase (CA, EC 4.2.1.1) inhibitory activities were tested on the human (h) isoforms hCA I and hCA II. The inhibition constant (Ki) of these sulfonamides were in the range of 232.16-637.70 nM toward the slow cytosolic isozyme hCA I, and in the range of 342.07-455.80 nM toward hCA II. Many of these compounds showed
Synthesis, cytotoxicity and in vitro antibacterial screening of novel hydrazones bearing thienopyridine moiety as potent COX-2 inhibitors
作者:Sherif M. H. Sanad、Ahmed E. M. Mekky
DOI:10.1007/s13738-020-01987-y
日期:2020.12
Abstract The starting precursors 2-carbohydrazides, bearing thienopyridine moiety, were prepared using 2-thioxopyridine-3-carbonitriles as key synthons. Next, 2-carbohydrazides were reacted with a variety of 4-substituted benzylidinemalononitriles or 4-substituted benzaldehydes to afford a new series of the target hydrazones incorporating thienopyridine moiety. The elemental analyses and spectral data were
The rapid synthesis of novel dicyclic spiropyrrolidine was reported, using [3+2]-cycloaddition of isatin N,N′-cyclic azomethine imine 1,3-dipoles, generated from the condensation of substituted isatins and pyrazolidones, with chalcones in 2–5 min. The dicyclic spiropyrrolidine oxoindole was smoothly acquired in moderate to excellent yields (35–95%) with high diastereoselectivities (>20 : 1 dr).
Highly enantioselective Michael addition of cyclopentanone with chalcones via novel di-iminium mechanism
作者:Junfeng Wang、Xin Wang、Zemei Ge、Tieming Cheng、Runtao Li
DOI:10.1039/b915852a
日期:——
The highly efficient asymmetric Michael addition reactions of cyclopentanone with chalcones were catalyzed by a simple and commercially available chiral 1,2-diaminocyclohexane-hexanedioic acid, and exhibited good yields (up to 92%) and excellent enantioselectivities (up to 99% ee). A new di-iminium mechanism for the reaction was proposed.