反应详情

A mixture of 2-amino-2-methyl-1-propanol, 7.2 g (0.05 mol), (Aldrich Chemical Company) and 4-methoxy-3-nitrobenzeneacetic acid, 16.7 g (0.079 mol), (Journal of the American Chemical Society, Vol. 70, pp. 2837-2843, (1948)) is refluxed overnight in xylene, 100 ml, under a water separator. The mixture is diluted with toluene, filtered, washed with an aqueous solution of potassium bicarbonate and water. The organic layer is separated and evaporated. The resulting gum is chromatographed over silica gel and eluted with ethyl acetate to give 7.6 g of 4,5-dihydro-2-[(4-methoxy-3-nitrophenyl)methyl]-4,4-dimethyloxazole after recrystallization from hexane; mp 88°-90° C.

1. filtrationfiltered
2. washwashed with an aqueous solution of potassium bicarbonate and water
3. customThe organic layer is separated
4. customevaporated
5. customThe resulting gum is chromatographed over silica gel
6. washeluted with ethyl acetate