Sodium Carbonate → 5-(7-Methyl-4-morpholino-6,7-dihydro-[1,4]dioxino[2,3-d]pyrimidin-2-yl)pyrimidin-2-amine

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Reaction Conditions

Reaction Steps

A mixture of 2-chloro-7-methyl-4-morpholin-4-yl-6,7-dihydro-[1,4]dioxino[2,3-d]pyrimidine (99 mg, 0.36 mmol), 5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyrimidin-2-ylamine (97 mg, 0.44 mmol), Pd(PPh3)2Cl2 (28 mg, 0.04 mmol) and sodium carbonate (1.2 mL, 1.20 mmol, 1M aqueous solution) in acetonitrile (1.2 mL) was degassed then heated at 140° C. for 25 minutes using microwave irradiation. The reaction mixture was filtered, flushing with ethyl acetate. The filtrate phases were separated and the aqueous layer extracted with ethyl acetate. The combined organic extracts were dried (Na2SO4) and concentrated in vacuo. The resulting residue was purified by column chromatography (SiO2, gradient 0-4% methanol in DCM) then triturated with diethyl ether affording 103 as a white solid (12 mg, 11%). LCMS: RT=3.06 min, [M+H]+=331. 1H NMR (400 MHz, DMSO): δ 8.90 (2H, s), 7.01 (2H, s), 4.57-4.47 (1H, m), 4.36 (1H, dd, J=11.41, 2.34 Hz), 3.82 (1H, dd, J=11.43, 7.60 Hz), 3.77-3.61 (8H, m), 1.34 (3H, d, J=6.44 Hz)

Provenance & Evidence