反应详情

Sodium hydride (0.28 g, 7.04 mmol) was added to a solution of (R)-3-(2-chloro-4-nitroimidazol-1-yl)-2-hydroxy-2-methylpropyl N-methyl-N-(4-trifluoromethoxybenzyl)carbamate prepared in Example 72 (2.74 g, 5.87 mmol) in DMF (20 ml) 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 then recrystallized from isopropanol to afford (R)-2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl N-methyl-N-(4-trifluoromethoxybenzyl)carbamate (1.40 g, yield 55%) as a white solid.

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