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An improved synthesis of a phosphopeptidomimetic prodrug targeting the Src Homology 2 (SH2) domain of signal transducer and activator of transcription 6 (STAT6) is reported. In our convergent methodology, we employed a phosphotyrosine surrogate active ester harboring pivaloyloxymethyl groups, which efficiently coupled to tert-butylglycinyl proline diarylamide. Biological evaluation of 1 has not been reported. We show that it inhibits STAT6 phosphorylation in intact human bronchial epithelial cells, suggesting potential application in the treatment of asthma.

Synthesis and in Vitro Evaluation of a Peptidomimetic Inhibitor Targeting the Src Homology 2 (SH2) Domain of STAT6