反应详情

To the solution of (R)-3-(2-chloro-4-nitroimidazol-1-yl)-2-hydroxy-2-methylpropyl 4-(4-trifluoromethoxyphenyl)piperazine-1-carboxylate prepared in Example 93 (1.29 g, 2.5 mmol) in DMF (13 ml), sodium hydride (0.12 g, 3 mmol) was added followed by stirring for 1 hour with cooling on ice-bath. To the reaction mixture, ice water was added, and the precipitates were filtered off, washed with water and recrystallized from isopropanol to afford (R)-2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl 4-(4-trifluoromethoxyphenyl)piperazine-1-carboxylate (0.70 g, yield 59%) as a white solid.

1. temperaturewith cooling on ice-bath
2. filtrationthe precipitates were filtered off
3. washwashed with water
4. customrecrystallized from isopropanol