反应详情

温度

25 °C

A solution of 2-n-butyl-1-(2-chlorophenyl)methyl-4,5-bis(hydroxy)methyl-1H-imidazole (Example 1(ii)) (310 mg, 1 mmol) in methylene dichloride (5 mL) was treated with 4-dimethylaminopyridine (5.2 mg), triethylamine (1.5 mmol) and t-butyl dimethylsilyl chloride (192 mg, 1.24 mmol). The mixture was stirred at 25° C. for 20 hours, diluted with water and the organic layer was washed well with water, dried, concentrated and chromatographed over silica gel with an ethyl acetate/methanol gradient to afford 127 mg (24%) of the bis (4,5-t-butyldimethylsilyl) ether and 252 mg (59%) of 2-n-butyl-1-(2-chlorophenyl)methyl-4-t-butyldimethysilyloxymethyl-5-hydroxymethyl-1H-imidazole. This monoether (252 mg) was oxidized to the 5-carboxaldehyde using manganese dioxide as described in Example 1(iii) to provide 170 mg of 2-n-butyl-1-(2-chlorophenyl)methyl-4-(t-butyldimethylsilyloxy)methyl-1H-imidazol-5-carboxaldehyde as an oil.

1. washthe organic layer was washed well with water
2. customdried
3. concentrationconcentrated
4. customchromatographed over silica gel with an ethyl acetate/methanol gradient