Sodium Carbonate → 3-[6-Chloro-2-(4-nitro-phenyl)-pyrimidin-4-yl]-8-oxa-3-aza-bicyclo[3.2.1]octane

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In a 0.5-2 mL microwave vial was placed 3-(6-chloro-2-iodopyrimidin-4-yl)-8-oxa-3-azabicyclo[3.2.1]octane (16, 50 mg, 0.142 mmol) and 4,4,5,5-tetramethyl-2-(4-nitrophenyl)-1,3,2-dioxaborolane (35.4 mg, 0.142 mmol) in DME (1.5 ml) to give an orange solution. Na2CO3 (2M solution in water) (0.284 ml, 0.569 mmol) was added. The mixture was degassed by bubbling nitrogen through the solution. Pd(PPh3)4 (16.43 mg, 0.014 mmol) was added and the mixture was heated under microwave irradiation for 60 min at 100° C. The mixture was diluted with ethyl acetate and washed with a saturated solution of NaHCO3. The organic phase was dried (MgSO4) and concentrated. The crude product was added to a silica gel column and was eluted with ethyl acetate in hexanes (10-25%). Collected fractions were concentrated to give 39 mg (0.11 mmol, 79%) of the title compound as an off-white/yellow solid. The thus obtained compound was identical to the same compound prepared according to Scheme 5.

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