Water → 7-(1-azidoethyl)-6-(2,5-difluorophenyl)-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 (0.080 g, 0.25 mmol) and (2,5-difluorophenyl)boronic acid (0.048 g, 0.30 mmol) in 1,4-dioxane (2 mL) was added a 1 N solution of sodium carbonate in water (0.38 mL, 0.38 mmol) and dichloro(bis{di-tert-butyl[4-(dimethylamino)phenyl]phosphoranyl})palladium (0.011 g, 0.015 mmol). The mixture was stirred at 100° C. overnight. After cooled to room temperature, the mixture was diluted with ethyl acetate, washed with water, dried over MgSO4, then concentrated and purified on silica gel (0-25% ethyl acetate/hexane) to give the desired product as a diastereoisomer mixture (54 mg). LCMS calculated for C15H12F2N5OS (M+H)+: m/z=348.1; Found: 348.0.

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