Design, synthesis, and in vitro cancer cell growth inhibition evaluation and antimalarial testing of trioxanes installed in cyclic 2-enoate substructures
摘要:
A novel series of 1,2,4-trioxanes were synthesized from 2H-pyrans via photooxidation, and their antiproliferative and growth factor inhibitory activity has been investigated across a variety of human cancer cell lines. Compounds 5k, 51, 5s, 7a and 7c exhibited the highest activity and selectivity against a human leukemia (MV4-11) cell line (IC50 = 0.5 mu M). Compound 5o showed the highest growth factor inhibitory activity against a melanoma (LOX-IMVI) cancer cell line (GI(50) = 1.0 mu M). A SAR study has confirmed the importance of the 1,2,4-trioxane unit as a pharmacophore for anticancer activity. The computer-assisted database analysis, COMPARE, has suggested that the compounds have unique mechanisms of actions that were different from those of known anticancer drugs. Some of the selected trioxanes were tested against the NF54 strain, albeit showing weak antiplasmodial activity. The molecular docking of trioxanes and hemin reveals that a short distance (130 angstrom) leads to their physical contact. The UV-vis spectroscopic analysis ensured the definite complexation between 1,2,4-trioxanes and hemin. The role of hemin-trioxane interaction in the hemin-induced oxidative damage has been studied using methylene blue as a substrate by UV-vis spectroscopy. (C) 2013 Elsevier Masson SAS. All rights reserved.
Ungesättigte Oxime, 28. Mitt. Notiz zur Darstellung α-verzweigter Zimtaldehyde und ihrer Oxime. The Synthesis of α-branched Cinnamyl Aldehydes and of their Oximes
Annulation of 2<i>H</i>-Pyran onto 1-Oxa- or 1-Azacyclohexane-2,4-diones and Their Analogues via Sequential Condensation with α-Substituted Enals and 6π-Electrocyclization
2H-Pyrans are constructed on a 1-oxa- or 1-azacyclohexane-2,4-dione core via Knoevenagel condensation with enals followed by 6π-electrocyclization, which are readily catalyzed with ethylenediammonium diacetate. This formal [3 + 3] strategy constitutes C–O and C–C bond making and the diastereomer formation is circumvented using 6,6-disubstitution with the same aryl group in the 1-oxacyclohexane-2,4-diones. This facile methodology significantly advances the access to polysubstituted bicyclic 2H-pyrans with a versatile substrate choice and improved stability of the product.
Enantioselective 1,2-Addition of α-Aminoalkyl Radical to Aldehydes via Visible-Light Photoredox Initiated Chiral Oxazaborolidinium Ion Catalysis
作者:Jae Yeon Kim、Yea Suel Lee、Yuna Choi、Do Hyun Ryu
DOI:10.1021/acscatal.0c02443
日期:2020.9.18
Enantioselective 1,2-addition reaction of α-aminoalkyl radical to α,β-unsaturated or aromaticaldehydes to synthesize highly optically active β-amino alcohols has been developed. In the presence of chiral oxazaborolidinium ion catalyst and photosensitizer, the reaction provides desired β-amino allylic or benzylic alcohols with high yields (up to 99%) and high enantioselectivities (up to 98% ee).
Trio Catalysis Merging Enamine, Brønsted Acid, and Metal Lewis Acid Catalysis: Asymmetric Three-Component Aza-Diels-Alder Reaction of Substituted Cinnamaldehydes, Cyclic Ketones, and Arylamines
作者:Yongming Deng、Siddhartha Kumar、Kraig Wheeler、Hong Wang
DOI:10.1002/chem.201406569
日期:2015.5.18
phosphoric acid, and Y(OTf)3, enables the combination of enamine catalysis with both hard metal Lewis acid catalysis and Brønsted acid catalysis for the first time. Using this catalyst system, a three‐component aza‐Diels–Alder reaction of substituted cinnamaldehyde, cyclicketone, and arylamine is carried out with high chemo‐ and enantioselectivity, affording a series of optically active 1,4‐dihydropyridine