After analysis of its selectivity profile, the most potent inhibitor was then developed to Stafia-1, the first small molecule shown to preferentially inhibit the STAT family member STAT5aover the close homologue STAT5b. A phosphonate prodrug based on Stafia-1 inhibited STAT5a with selectivityoverSTAT5b in human leukemia cells, providing the first demonstration of selective in vitro and intracellular
New Syntheses of Alkylaryl and Diaryl Disubstituted Phenols and Ethyl Salicylates The sodium acetate- or triethylamine-catalyzed reaction of the chalcones and chalcone analogues 1a-n with 1-(2-oxopropyl)pyridinium chloride (2) or 1-(3-ethoxycarbonyl-2-oxopropyl)pyridinium bromide (3) gives the 3,5-disubstituted phenols (6a-g) or the 4,6-disubstituted ethyl 2-hydroxybenzoates (7a-1) in yields from 25 to 83α. Both reactions fail for chalcones with one o-substituted aryl substituent or for p,p′-dinitro-substituted diarylchalcones.