Chlorotrimethylsilane → HCID 59351395, compound

Participants

Reaction Steps

A mixture of chlorotrimethylsilane (0.11 mL, 0.87 mmol) and 1,2 dibromoethane (0.075 mL, 0.87 mmol) was added slowly to a stirred mixture of zinc dust (0.71 g, 10.9 mmol) in DMA (2 mL) at room temperature under a nitrogen atmosphere. The mixture was stirred for 15 min before a solution of 4-iodooxepane (1.97 g, 8.71 mmol) in DMA (5 mL) was added dropwise via syringe. The reaction mixture was stirred at room temperature for an additional 30 min before being warmed to 60° C. for 15 min. The reaction mixture was cooled to room temperature and added directly via syringe to a stirred mixture of 2-fluoro-3-iodopyrazine (1.39 g, 6.23 mmol), copper(i) iodide (0.12 g, 0.62 mmol), and dichloro(1,1-bis(diphenylphosphinoferrocene))palladium(ii) (0.25 g, 0.31 mmol) in DMA (8 mL) under an argon atmosphere. The reaction mixture was stirred at 80° C. for 3 h. The reaction mixture was cooled to room temperature, quenched with sat. ammonium chloride, and extracted with EtOAc. The organic layer was separated, washed with sat. sodium chloride, dried over magnesium sulfate, filtered, and concentrated in vacuo. The resulting crude product was purified by silica gel chromatography to give 2-fluoro-3-(oxepan-4-yl)pyrazine. [M+1]=197.1.

Provenance & Evidence