Sodium Carbonate → 2-(2-aminopyrimidin-5-yl)-8-methyl-4-morpholino-6H-pyrimido[5,4-b][1,4]oxazin-7(8H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-chloro-8-methyl-4-morpholin-4-yl-8H-pyrimido[5,4-b][1,4]oxazin-7-one (100 mg, 0.35 mmol), 5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyrimidin-2-ylamine (116 mg, 0.53 mmol), Pd(PPh3)2Cl2 (25 mg, 0.035 mmol) and sodium carbonate (1.0 mL, 1.0 mmol, 1M aqueous solution) in acetonitrile (4 mL) was degassed then heated at 120° C. for 30 minutes using microwave irradiation. The reaction mixture was loaded onto an Isolute® SCX-2 cartridge which was washed with methanol and the product eluted with 2M ammonia in methanol. The basic fractions were combined and concentrated in vacuo. The resulting residue was purified by reverse phase HPLC (Phenomenex Gemini 5 μm C18, 0.1% HCO2H in water on a gradient of acetonitrile 5-98%) affording 120 as a white solid (86 mg, 71%). LCMS: RT=3.04 min, [M+H]+=344. 1H NMR (400 MHz, CDCl3): δ 9.14 (2H, s), 5.25 (2H, broad s), 4.62 (2H, s), 3.81 (8H, s), 3.49 (3H, s).

Provenance & Evidence