Water → 7-(1-azidoethyl)-6-(5-fluoropyridin-3-yl)-3-methyl-5H-[1,3]thiazolo[3,2-a]pyrimidin-5-one

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To a mixture of 7-(1-azidoethyl)-6-bromo-3-methyl-5H-[1,3]thiazolo[3,2-a]pyrimidin-5-one (0.12 g, 0.38 mmol) and 3-fluoro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (0.10 g, 0.46 mmol) in 1,4-dioxane (3 mL) was added a 1 N solution of sodium carbonate in water (0.57 mL, 0.57 mmol) and dichloro(bis{di-tert-butyl[4-(dimethylamino)phenyl]phosphoranyl})palladium (0.014 g, 0.020 mmol). The mixture was heated at 100° C. overnight. After cooling, the mixture was diluted with ethyl acetate, washed with water, dried over Na2SO4, concentrated and purified on silica gel (0-45% ethyl acetate/hexanes) to give the desired product (0.020 g, 16%). LCMS calculated for C14H12FN6OS (M+H)+: m/z=331.1. Found: 331.0.

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