Sodium Iodide → HCID 69635205, compound

Participants

Reaction Steps

A mixture of 2-chloro-4-nitro-1H-imidazole (6.1 g, 41.35 mmol), (S)-(+)-glycidyl tosylate (12.27 g, 53.75 mmol) and sodium hydrogencarbonate (7.3 g, 86.89 mmol) in ethanol (30 ml) was stirred under reflux for 9 hours. The reaction mixture was allowed to return to room temperature, then diluted with water, and the solution was extracted with methylene chloride twice. The extract was washed with a saturated saline solution, dried over magnesium sulfate and then filtered. The filtrate was concentrated to afford a foam. The resulting foam was dissolved in DMF (60 ml). To the solution, tert-butyl piperazine-1-carboxylate (8.47 g, 45.48 mmol), triethylamine (6.92 ml, 49.64 mmol) and sodium iodide (6.82 g, 45.5 mmol) were added followed by stirring at room temperature for 24 hours. The reaction mixture was poured into water, and extracted with ethyl acetate twice. The organic phases were combined, washed with water three times, dried over magnesium sulfate and then filtered. The filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (ethyl acetate) to afford tert-butyl (R)-4-[3-(2-chloro-4-nitroimidazol-1-yl)-2-hydroxypropyl]piperazin-1-carboxylate (6.43 g, yield 40%) as a light yellow oil.

Provenance & Evidence