A cinchona alkaloid catalyzed enantioselective sulfa-Michael/aldol cascade reaction of isoindigos: construction of chiral bispirooxindole tetrahydrothiophenes with vicinal quaternary spirocenters
作者:Yong-Yuan Gui、Jian Yang、Liang-Wen Qi、Xiao Wang、Fang Tian、Xiao-Nian Li、Lin Peng、Li-Xin Wang
DOI:10.1039/c5ob00774g
日期:——
Enantioselective sulfa-Michael/aldol reaction of isoindigos has been successfully developed to afford bispirooxindole tetrahydrothiophenes with vicinal quaternary spirocenters.
Enantioselective Synthesis of Trifluoromethyl α,β-Unsaturated δ-Lactones via Vinylogous Aldol-Lactonization Cascade
作者:Simone Crotti、Nicola Di Iorio、Andrea Mazzanti、Paolo Righi、Giorgio Bencivenni
DOI:10.1021/acs.joc.8b01672
日期:2018.10.19
by a bifunctional tertiary amine, provides an efficient application of the vinylogous reactivity of alkylidene oxindoles for the preparation of enantioenriched trifluoromethylated α,β-unsaturated δ-lactones.
A facilesynthesis of highly substituted as well as conjugated unsymmetrical azines via the reaction of propargyl alcohols and isatin hydrazones in the presence of iodine is demonstrated under open to air. A series of unsymmetrical azines have been synthesized with excellent yields from simple and readily available starting materials in a complete stereoselective manner.
New hydrazonoindolin-2-ones: Synthesis, exploration of the possible anti-proliferative mechanism of action and encapsulation into PLGA microspheres
作者:Mohamed I. Attia、Wagdy M. Eldehna、Samar A. Afifi、Adam B. Keeton、Gary A. Piazza、Hatem A. Abdel-Aziz
DOI:10.1371/journal.pone.0181241
日期:——
The synthesis and molecular characterization of new isatin-based hydrazonoindolin-2-ones 4a-o and 7a-e are reported. The in vitro anti-proliferative potential of the synthesized compounds 4a-o and 7a-e was examined against HT-29 (colon), ZR-75 (breast) and A549 (lung) human cancer cell lines. Compounds 7b, 7d and 7e were the most active congeners against the tested human cancer cell lines with average IC50 values of 4.77, 3.39 and 2.37 μM, respectively, as compared with the reference isatin-based drug, sunitinib, which exhibited an average IC50 value of 8.11 μM. Compound 7e was selected for further pharmacological evaluation in order to gain insight into its possible mechanism of action. It increased caspase 3/7 activity by 2.4- and 1.85-fold between 4 and 8 h of treatment, respectively, at 10 μM and it caused a decrease in the percentage of cells in the G1 phase of the cell cycle with a corresponding increase in the S-phase. In addition, compound 7e increased phosphorylated tyrosine (p-Tyr) levels nearly two-fold with an apparent IC50 value of 3.8 μM. The 7e-loaded PLGA microspheres were prepared using a modified emulsion-solvent diffusion method. The average encapsulation efficiency of the 7e-loaded PLGA microspheres was 85% ± 1.3. While, the in vitro release profile of the 7e-loaded microspheres was characterized by slow and continuous release of compound 7e during 21 days and the release curve was fitted to zero order kinetics. Incorporation of 7e into PLGA microspheres improved its in vitro anti-proliferative activity toward the human cancer cell line A549 after 120 h incubation period with an IC50 value less than 0.8 μM.
Synthesis of some new mixed azines, Schiff and Mannich bases of pharmaceutical interest related to isatin
作者:Elsayed M. Afsah、Saad S. Elmorsy、Soha M. Abdelmageed、Zaki E. Zaki
DOI:10.1515/znb-2014-0262
日期:2015.6.1
bases 14 and 15 were obtained from 10a and 10b. Treatment of 2 with succinic, phthalic and quinolinic anhydride and pyromellitic dianhydride afforded compounds 16, 17a, 17b and 18, respectively. The synthesis of isatin Schiff bases incorporating a benzoylpiperidine, benzoylmorpholine and 1,4-dibezoylpiperazine moiety and their N-Mannich bases was investigated.