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温度

0 °C

To a suspension of 293 milligrams (1.22 mM) of sodium hydride in 30 ml of anhydrous tetrahydrofuran was added, in portions, 3 g (1.22 mM) of isopropyl 2-bromo-4-methyl-5-imidazolecarboxylate. The resulting suspension was cooled to 0° C. and 1.5 g (1.22 mM) of chloromethyl-n-butyl ether was added dropwise. The reaction mixture was stirred overnight at room temperature. The precipitated sodium chloride was removed by filtration and concentration of the filtrate in vacuo gave 3.6 g of isopropyl N-n-butoxymethyl-2-bromo-4-methyl-5-imidazolecarboxylate as a golden oil (87%). Subsequent analysis indicated that the 3-isomer/1-isomer ratio was 91/9.

1. customThe precipitated sodium chloride was removed by filtration and concentration of the filtrate in vacuo