Specific inhibitors of tyrosine-specific protein kinase. I. Synthesis and inhibitory activities of .ALPHA.-cyanocinnamamides.

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Abstract
A series of .alpha.-cyanocinnamamide derivatives was synthesized and evaluated for inhibitory activity against tyrosine-specific protein kinase using intact plasma membrane fractions from an epidermoid carcinoma cell line, A-431 cells. Among these compounds, several novel .alpha.-cyano-4-hydroxy-3,5-disubstituted cinnamamide derivatives, e.g., .alpha.-cyano-3-ethoxy-4-hydroxy-5-phenylthiomethylcinnamamide (ST 638), showed potent inhibitory activity. The studies on the structure-activity relationship revealed that the presence of the hydroxy group at the 4 position and the double bond in the .alpha.-cyano-4-hydroxycinnamamide skeleton was important for potent inhibitory activity, and that the presence of hydrophobic groups at the 3 and 5 positions on the benzene ring also enhanced the inhibitory activity of .alpha.-cyano-4-hydroxycinnamamide derivatives.

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