Ethyl Acetate → HCID 9976903, compound

Participants

Reaction Steps

(S)-1-(2-Chloro-4-nitroimidazol-1-yl)-2-methyl-3-[4-(4-chlorophenyl)piperazin-1-yl]propan-2-ol prepared in Example 370 (33.0 g, 79.7 mmol) was dissolved in DMF (300 ml). To the solution, sodium hydride (3.7 g, 91.6 mmol) was added with cooling on ice-bath followed by stirring at room temperature overnight. To the reaction mixture, ice-water and ethyl acetate were added, and the solution was vigorously stirred. The precipitates were filtered off, washed with water and ethyl acetate, and dried under reduced pressure to afford 23.2 g of a crude light yellow powder. The crude powder was combined with another crude powder synthesized in the same manner (50 g), and the mixture was purified by silica gel column chromatography (methylene chloride/ethyl acetate=50/1) and crystallized from methylene chloride-ethyl acetate to afford (S)-2-[4-(4-chlorophenyl)piperazin-1-ylmethyl]-2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazole (45 g, yield 90%) as a white powder.

Provenance & Evidence