3-Alkylamino- and 3-arylamino isothiazole dioxides unsubstituted at C-4 and C-5 were synthesized starting from dithiopropionic amides. Taking advantage of the direct chlorination during the cyclization process or realizing an addition–elimination process with bromine on the final 3-aminoisothiazole dioxide derivatives, the corresponding 5-chloro-, 4,5-dichloro- or the 4-bromoisothiazole dioxides could
Novel Irreversible Epidermal Growth Factor Receptor Inhibitors by Chemical Modulation of the Cysteine-Trap Portion
作者:Caterina Carmi、Andrea Cavazzoni、Stefano Vezzosi、Fabrizio Bordi、Federica Vacondio、Claudia Silva、Silvia Rivara、Alessio Lodola、Roberta R. Alfieri、Silvia La Monica、Maricla Galetti、Andrea Ardizzoni、Pier Giorgio Petronini、Marco Mor
DOI:10.1021/jm901558p
日期:2010.3.11
Irreversible EGFR inhibitors can circumvent acquired resistance to first-generation reversible, ATP-competitive inhibitors in the treatment of non-small-cell lung cancer. They contain both a driver group, which assures target recognition, and it warhead, generally an acrylamide or propargylamide fragment that binds covalently to Cys797 within the kinase domain of EGFR. We performed it systematic exploration of the role for the warhead group, introducing different cysteine-trapping fragments at position 6 of a traditional 4-anilinoquinazoline scaffold. We found that different reactive groups, including epoxyamides (compounds 3-6) and phenoxyacetamides (compounds 7-9), were able to irreversibly inhibit EGFR. In particular, at significant lower concentrations than gefitinib (1), (2R,3R)-N-(4-(3-bromoanilino)quinazolin-6-yl)-3-(piperidin-1-ylmethyl)oxirane-2-carboxamide (6) inhibited EGFR autophosphorylation and downstream Signaling pathways, Suppressed proliferation, and induced apoptosis in gefitinib-resistant NSCLC H 1975 cells, harboring the T790M mutation in EGFR.
<i>Tilcotil</i><sup>®</sup>Studies [3+2] additions with isothiazol-3(2<i>H</i>)-one 1,1-dioxide
作者:Kaspar F. Burri
DOI:10.1002/hlca.19890720630
日期:1989.9.20
Derivatives of isothiazol-3(2H)-one 1,1-dioxide react regiospecifically with 1,3-dipolar agents. The main regiocontrolling factor is ascertained to be the CO group of the dipolarophile. The topology of the adducts is also in general agreement with predictions based on perturbation theory. Several adducts can be aromatized to heterocyclic equivalents of saccharin, and may then be elaborated into structural