Sodium methanesulfinate → 10-Chloro-7-(1-ethylpropyl)-1-[3-methyl-5-(methylsulfonyl)pyridin-2-yl]-2,3,4,5-tetrahydro-1H-[1,3]diazepino[1,2-a]benzimidazole

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-(5-bromo-3-methylpyridin-2-yl)-10-chloro-7-(1-ethylpropyl)-2,3,4,5-tetrahydro-1H-[1,3]diazepino[1,2-a]benzimidazole (463 mg, 0.216 mmol), sodium methanesulfinate (66 mg, 0.648 mmol) and copper(I) iodide (123 mg, 0.648 mmol) in 1-methyl-2-pyrrolidinone (1.0 mL) was heated under microwave irradiation at 180° C. for 1 hr. After cooling, the mixture was diluted with ethyl acetate, filtered through a pad of celite, washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 10-50% ethyl acetate/n-hexane gradient mixture followed by recrystallization from ethyl acetate/n-hexane to afford the title compound (36 mg, 36%) as a colorless solid.

Provenance & Evidence