2-Aminobenzimidazole → HCID 178517390, compound

Participants

Reaction Steps

To a mixture of 2-iodo-3-methoxy-acrylic acid methyl ester (1, 1.21 g, 5 mmol), 1H-benzoimidazol-2-ylamine (2, 0.67 g, 5 mmol) and ethanol (30 mL) was added a solution of sodium methoxide (10 mL, 0.5 M in methanol, 5 mmol). The resulted mixture was refluxed for 3 h and concentrated to afford 3-iodo-10H-benzo[4,5]imidazo[1,2-a]pyrimidin-2-one (3). A mixture of (3-tert-butoxycarbonylamino-propyl)-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzyl]carbamic acid tert-butyl ester (4, 490 mg, 1 mmol), 3 (311 mg, 1 mmol), K2CO2 (414 g, 3 mmol), Pd(PPh3)4 (0) (41 mg, 0.05 mmol), ethanol (6 mL), dioxane (2 mL) and water (2 mL) was degassed and heated at 80° C. for 20 h under argon atmosphere. The reaction mixture was diluted with EtOAc (500 mL), washed with water (300 mL) and brine (300 mL). The organic solution was concentrated and purified by flash chromatography (0%-6% MeOH in methanechloride) to give desired product 5 (170 mg, 31%) as light yellow solid. LCMS (EI) m/z: 570 (M+Na+).

Provenance & Evidence