Sodium hydride → Tert-butyl 4-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethoxy)phenyl]piperazine-1-carboxylate

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Reaction Conditions

Reaction Steps

tert-Butyl 4-(4-hydroxyphenyl)piperazine-1-carboxylate (1.5 g, 5.4 mmol) and 2-bromo-1-(2-methyl-oxiranylmethyl)-4-nitro-1H-imidazole (1.96 g, 7.5 mmol) are dissolved in DMF (100 ml) and sodium hydride (0.39 g, 9.7 mmol, 60% in mineral oil) is added at room temperature. Once gas evolution ceases the mixture is heated to 60° C. for 1 h. The mixture is cooled, diluted with water and extracted with ethyl acetate. The combined extracts are purified by silica gel chromatography (1% methanol in methylene chloride) to give 2.2 g (88%) of the product as a tan solid. ESI MS m/z 482 (M+Na+); 1H NMR (400 MHz, CDCl3) δ 7.58 (s, 1H), 6.87 (d, J=8.8 Hz, 2H), 6.78 (d, J=8.8 Hz, 2H), 4.48 (d, 10 Hz, 1H), 4.18 (d, J=10.4 Hz, 1H), 4.02 (t, J=9.2 Hz, 1H), 4.0-3.55 (m, 4H), 3.05-2.99 (m, 4H), 1.77 (s, 2H), 1.57 (s, 9H), 1.47 (s, 3H).

Provenance & Evidence