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Synthesis and Src Kinase Inhibitory Activity of a Series of 4-Phenylamino-3-quinolinecarbonitriles

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journal contribution
posted on 24.01.2001 by Diane H. Boschelli, Yanong D. Wang, Fei Ye, Biqi Wu, Nan Zhang, Minu Dutia, Dennis W. Powell, Allan Wissner, Kim Arndt, Jennifer M. Weber, Frank Boschelli
Screening of a directed compound library in a yeast-based assay identified 4-[(2,4-dichlorophenyl)amino]-6,7-dimethoxy-3-quinolinecarbonitrile (2a) as a Src inhibitor. An enzymatic assay established that 2a was an ATP-competitive inhibitor of the kinase activity of Src. We present here SAR data for 2a which shows that the aniline group at C-4, the carbonitrile group at C-3, and the alkoxy groups at C-6 and C-7 of the quinoline are crucial for optimal activity. Increasing the size of the C-2 substituent of the aniline at C-4 of 2a from chloro to bromo to iodo resulted in a corresponding increase in Src inhibition. Furthermore, replacement of the 7-methoxy group of 2a with various 3-heteroalkylaminopropoxy groups provided increased inhibition of both Src enzymatic and cellular activity. Compound 25, which contains a 3-morpholinopropoxy group, had an IC50 of 3.8 nM in the Src enzymatic assay and an IC50 of 940 nM for the inhibition of Src-dependent cell proliferation.