Preparation and evaluation of trisubstituted pyrimidines as phosphatidylinositol 3-kinase inhibitors. 3-Hydroxyphenol analogues and bioisosteric replacements

Two classes of trisubstituted pyrimidines related to PI-103 1 have been prepared and their inhibitory activities against phosphatidylinositol 3-kinase (PI3K) p110α were determined. From those with direct 6-aryl substitution compound 11a was the most potent inhibitor with an IC₅₀ value of 62 nM, and showed similar activity against other class 1a PI3K isoforms tested, p110β and p110γ. When a linking chain was introduced, as in the second exemplified class, compound 15f inhibited p110α with IC₅₀ 142 nM, and showed greater selectivity towards p110α. Compounds of both classes showed promising inhibition of cellular proliferation in IGROV-1 ovarian cancer cells. Among compounds designed to replace the 3-phenolic motif with structural isosteres, analogues incorporating a 4-indazolyl group possessed enzyme and cellular activities comparable to the parent phenols.

Design and combinatorial synthesis of a library of methylenesulfonamides and related compounds as potential kinase inhibitors

An effective parallel solid phase route to methylenesulfonamides and amides bearing a wide variety of substituents is described. The three key reaction steps were reductive amination of a haloheteroaromatic aldehyde onto a benzhydrylamine type polystyrene resin, sulfonamide or amide formation and palladium catalysed transformation of the remaining heteroaromatic halogen. A process of virtual library design and filtering, together with solution and solid phase optimizations, aided the preparation of several novel drug-like product classes in high purities and should allow access to a variety of further useful analogues.