An anomalous course of the reduction of 2-(3-oxo-3,4-dihydro-quinoxalin-2-yl)benzene diazonium salt. Synthesis of a new quinoxalino[1,2-<i>c</i>][1,2,3]benzotriazine system
By diazotization of 3-(2-aminophenyl)quinoxaline-2(lH)-one la and 3-(2-aminophenyl)-6,7-dimethylquinoxaline-2(lH)-one 1b followed by the reaction with sodium sulphite new quinoxalino[1,2-c]-[1,2,3]benzotriazins 4a and 4b were prepared, respectively.
由3-(2-氨基苯基)喹喔啉-2(升的重氮化ħ) -酮LA和3-(2-氨基苯基)-6,7- dimethylquinoxaline -2(ħ) -酮1B,接着用亚硫酸钠反应分别制备了新的喹喔啉[1,2- c ]-[1,2,3]苯并三嗪4a和4b。
A Potent and Selective Quinoxalinone-Based STK33 Inhibitor Does Not Show Synthetic Lethality in KRAS-Dependent Cells
作者:Michel Weïwer、James Spoonamore、Jingqiang Wei、Boris Guichard、Nathan T. Ross、Kristina Masson、Whitney Silkworth、Sivaraman Dandapani、Michelle Palmer、Christina A. Scherer、Andrew M. Stern、Stuart L. Schreiber、Benito Munoz
DOI:10.1021/ml300246r
日期:2012.12.13
The KRAS oncogene is found in up to 30% of all human tumors. In 2009, RNAi experiments revealed that lowering mRNA levels of a transcript encoding the serine/threonine kinase STK33 was selectively toxic to KRAS-dependent cancer cell lines, suggesting that small-molecule inhibitors of STK33 might selectively target KRAS-dependent cancers. To test this hypothesis, we initiated a high-throughput screen using compounds in the Molecular Libraries Small Molecule Repository (MLSMR). Several hits were identified, and one of these, a quinoxalinone derivative, was optimized. Extensive SAR studies were performed and led to the chemical probe ML281 that showed low nanomolar inhibition of purified recombinant STK33 and a distinct selectivity profile as compared to other STK33 inhibitors that were reported in the course of these studies. Even at the highest concentration tested (10 mu M), ML281 had no effect on the viability of KRAS-dependent cancer cells. These results are consistent with other recent reports using small-molecule STK33 inhibitors. Small molecules having different chemical structures and kinase-selectivity profiles are needed to fully understand the role of STK33 in KRAS-dependent cancers. In this regard, ML281 is a valuable addition to small-molecule probes of STK33.
Facile synthesis of quinoxaline annulated perfluoroalkylated benzoazepine derivatives
Novel perfluoroalkylated benzoazepinoquinoxaline derivatives were synthesized by consecutive intermolecular Michael addition and intramolecular cyclization from 3-(2-aminophenyl)quinoxalin-2(1H)-ones and methyl perfluoroalk-2-ynoates in good yields. This efficient and mild protocol might afford a new pathway for novel drug development.