Cesium carbonate → 1-(2-(6-(6-amino-pyridin-3-yloxy)-2-pyridin-2-yl-3H-benzimidazol-5-yl)-pyrrolidin-1-yl)-ethanone

Participants

Reaction Conditions

Reaction Steps

53.5 mg of 5-bromo-2-nitro-pyridine, 84.2 mg of cesium carbonate and 25 mg of copper(II) oxide were added to a pyridine (1 ml) solution of 55.0 mg of 1-(2-(6-hydroxy-2-pyridin-2-yl-3-(2-trimethylsilanyl-ethoxymethyl)-3H-benzimidazol-5-yl)-pyrrolidin-1-yl)-ethanone obtained in Example 121 (step 10), and the reaction liquid was stirred overnight in a sealed tube at 120° C. After cooled, aqueous saturated ammonium chloride and saturated saline were added in order to the reaction liquid, extracted with ethyl acetate and dried with anhydrous magnesium sulfate. The solvent was evaporated away under reduced pressure, and 0.016 ml of hydrazine monohydrate and 20 mg of developed Raney nickel catalyst were added to an ethanol (2 ml) solution of the resulting residue, and the reaction liquid was stirred at room temperature for 30 minutes. The catalyst was removed through filtration through Celite, and the solvent was evaporated away under reduced pressure. The resulting residue was purified through partitioning thin-layer chromatography (Kieselgel™ 60F254, Art 5744 (by Merck), chloroform/methanol=9/1) to obtain the entitled compound as a yellow oily substance.

Provenance & Evidence