Morpholine → 2-[4-(3-chloropyridin-2-yl)phenyl]-6-morpholin-4-yl-1H-benzoimidazole

Participants

Reaction Steps

To a solution of 162 mg (0.42 mmol) 6-bromo-2-(4-(3-chloropyridin-2-yl)phenyl)-1H-benzoimidazole in 6 mL dichloromethane were added 0.2 mL (1.15 mmol) N,N-dimethylisopropylethylamine and 0.1 mL (0.57 mmol) 2-(trimethylsilyl)ethoxymethyl chloride, followed by stirring at room temperature for 16 hours. After vacuum concentration, 26 μL (0.30 mmol) morpholine, 56.3 mg (0.013 mmol) tris(dibenzylidine acetone)dipalladium(0), 10 mg (0.038 mmol) 2-(di-t-butylphosphino)biphenyl, and 38.8 mg (0.41 mmol) sodium-t-botoxide were added to the concentrate, which was then dissolved in 2.5 mL toluene and allowed to react at 90° C. for 10 min in a microwave reactor. After being cooled to room temperature, the product was dissolved in 5 mL ethyl acetate and filtered with diatomite. The filtrate was dried over magnesium sulfate and vacuum concentrated. The concentrate was dissolved in 3 mL of a mixture of trifluoro fluoroacetic acid and methylene:chloride (1:1) and stirred for 12 hours. Neutralization with 10% NaOH, extraction with ethyl acetate, drying with magnesium sulfate and vacuum concentration were sequentially conducted in that order. The residue thus obtained was separated using column chromatography (developing solvent: hexane/ethyl acetate=1/1) to produce 115 mg of 2-[4-(3-chloropyridin-2-yl)phenyl]-6-morpholin-4-yl-1H-benzoimidazole (yield 70%).

Provenance & Evidence