- Discovery of Novel Azetidine Amides as Potent Small-Molecule STAT3 Inhibitors
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We optimized our previously reported proline-based STAT3 inhibitors into an exciting new series of (R)-azetidine-2-carboxamide analogues that have sub-micromolar potencies. 5a, 5o, and 8i have STAT3-inhibitory potencies (IC50) of 0.55, 0.38, and 0.34 μM, respectively, compared to potencies greater than 18 μM against STAT1 or STAT5 activity. Further modifications derived analogues, including 7e, 7f, 7g, and 9k, that addressed cell membrane permeability and other physicochemical issues. Isothermal titration calorimetry analysis confirmed high-affinity binding to STAT3, with KD of 880 nM (7g) and 960 nM (9k). 7g and 9k inhibited constitutive STAT3 phosphorylation and DNA-binding activity in human breast cancer, MDA-MB-231 or MDA-MB-468 cells. Furthermore, treatment of breast cancer cells with 7e, 7f, 7g, or 9k inhibited viable cells, with an EC50 of 0.9-1.9 μM, cell growth, and colony survival, and induced apoptosis while having relatively weaker effects on normal breast epithelial, MCF-10A or breast cancer, MCF-7 cells that do not harbor constitutively active STAT3.
- Brotherton-Pleiss, Christine,Yue, Peibin,Zhu, Yinsong,Nakamura, Kayo,Chen, Weiliang,Fu, Wenzhen,Kubota, Casie,Chen, Jasmine,Alonso-Valenteen, Felix,Mikhael, Simoun,Medina-Kauwe, Lali,Tius, Marcus A.,Lopez-Tapia, Francisco,Turkson, James
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p. 695 - 710
(2021/01/14)
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- Palladium(I) Dimer Enabled Extremely Rapid and Chemoselective Alkylation of Aryl Bromides over Triflates and Chlorides in Air
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Disclosed herein is the first general chemo- and site-selective alkylation of C?Br bonds in the presence of COTf, C?Cl and other potentially reactive functional groups, using the air-, moisture-, and thermally stable dinuclear PdI catalyst, [Pd(μ-I)PtBu3]2. The bromo-selectivity is independent of the substrate and the relative positioning of the competing reaction sites, and as such fully predictable. Primary and secondary alkyl chains were introduced with extremely high speed (5 min reaction time) at room temperature and under open-flask reaction conditions.
- Kalvet, Indrek,Sperger, Theresa,Scattolin, Thomas,Magnin, Guillaume,Schoenebeck, Franziska
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supporting information
p. 7078 - 7082
(2017/06/13)
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- Structure-activity relationship study of E6 as a novel necroptosis inducer
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Necroptosis inducers represent a promising potential treatment for drug-resistant cancer. We herein describe the structure modification of E6, which was identified recently as a potent and selective necroptosis inducer. The studies described herein demonstrate for the first time that functionalized biphenyl derivatives possess necroptosis inducer activity. Furthermore, these studies have led to the identification of two promising compounds (5h and 5j) that can be used for further optimization studies as well as mechanism of action investigations.
- Mou, Jianfeng,Park, Ann,Cai, Yu,Yuan, Junying,Yuan, Chengye
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supporting information
p. 3057 - 3061
(2015/06/22)
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- NOVEL PROTEIN TYROSINE PHOSPHATASE - IB INHIBITORS
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The present invention relates to the novel compounds of the general formula (I), wherein the symbols are same as described in specification, their pharmaceutically acceptable salts, their tautomeric forms, their stereoisomers, pharmaceutical compositions containing them, to process and intermediates for the preparation of the above said compounds, having the utility of these compounds in medicine and to methods for their therapeutic use, and their use in the treatment of diabetes and related diseases.
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- NOVEL PROTEIN TYROSINE PHOSPHATASE - IB INHIBITORS
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The present invention relates to the novel compounds of the general formula (I), wherein the symbols are same as described in specification, their pharmaceutically acceptable salts, pharmaceutical compositions containing them, to process and intermediates for the preparation of the above said compounds, having the utility of these compounds in medicine and to methods for their therapeutic use, and their use in the treatment of metabolic disorders.
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