Diisopropylethylamine → (R)-3-(2-chloro-4-nitroimidazol-1-yl)-2-hydroxy-2-methylpropyl N-methyl-N-(4-trifluoromethoxyphenyl)carbamate

Participants

Reaction Conditions

Reaction Steps

N-Methyl-N-(4-trifluoromethoxyphenyl)-carbamoyl chloride (1.33 g, 5.23 mmol), N,N-diisopropylethylamine (1.2 ml, 6.97 mmol) and 4-dimethylaminopyridine (85 mg, 0.70 mmol) were added to a suspension of (R)-2-chloro-1-(2,3-dihydroxy-2-methyl)propyl-4-nitroimidazole prepared in Example 10 (0.82 g, 3.48 mmol) in toluene (10 ml) followed by stirring at 100° C. for 5 hours. The reaction mixture was diluted with ethyl acetate, and the solution was washed with water, dried over magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (n-hexane/ethyl acetate=2/1) to afford (R)-3-(2-chloro-4-nitroimidazol-1-yl)-2-hydroxy-2-methylpropyl N-methyl-N-(4-trifluoromethoxyphenyl)carbamate (1.04 g, yield 65%) as a light yellow amorphous form.

Provenance & Evidence