A one-pot synthesis of new 4-(1,3-thiazolo[5,4-b]pyridin-2-yl)benzene-1,3-diols has been described. The compounds were prepared by the reaction of sulfinylbis[(2,4-dihydroxyphenyl)methanethione] derivatives, with various substituents in the aryl rings, with 2-chloropyridin-3-amines. Their structures were deduced from IR and, (1) H- and (13) C-NMR spectroscopic, mass spectrometric, and elemental analyses. The antiproliferative properties of some of the products against human cancer cell lines were comparable to those of cisplatin. Structure-activity analysis showed that the presence of hydrophobic substituents in both heterocyclic fused and phenyl rings of the compounds improves their biological effects. Further, an additional OH group in the resorcinol moiety reduced the antiproliferative activity.
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