Sodium Carbonate → 4-(2,4-di-tert-butoxypyrimidin-5-yl)-7H-pyrrolo[2,3-d]pyrimidine

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2,4-Di-tert-butoxypyrimidin-5-ylboronic acid (17.5 g, 65.4 mmol), tetrakis(triphenylphosphine) palladium(0) (7.6 g, 6.54 mmol) and sodium carbonate (20.8 g, 196 mmol) were added to a solution of 4-chloro-7H-pyrrolo[2,3-d]pyrimidine (10 g, 65.4 mmol) in DME (400 mL) and water (150 mL). With vigorous stirring, the mixture was heated to 80° C. for 24 h. The reaction mixture was cooled to RT and poured into water (100 mL). The mixture was extracted with EtOAc (100 mL) twice. The combined organic layers were washed with brine, dried over Na2SO4, and concentrated to give the crude product. This was purified by flash chromatography to give 4-(2,4-di-tert-butoxypyrimidin-5-yl)-7H-pyrrolo[2,3-d]pyrimidine (16.0 g, 72%) as a yellow solid. MS (APCI, pos. ion) m/z: 342.1 [M+H]+

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