Synthesis and HIV-integrase strand transfer inhibition activity of 7-hydroxy[1,3]thiazolo[5,4-b]pyridin-5(4H)-ones

An efficient synthesis of methyl 7-hydroxy[1,3]thiazolo[5,4-b]pyridin-5(4H)-one-6-carboxylates (8–10 and 16) and 6-carboxamides (17–20) is described. Sub-micromolar enzyme inhibition of HIV integrase was achieved with several carboxamide analogs which were superior to their carboxylic ester congeners.