反应详情

A mixture of 6-nitro-2,3-dihydrobenz-1,4-oxazine (0.45 g.), methyl 3-bromomethylbenzoate* (Y) (0.58 g.), potassium carbonate (0.35 g.), and sodium iodide (0.38 g.) in dry 2 -butanone (25 ml.) was stirred and heated under reflux for 48 hours. The cooled reaction mixture was filtered, the filter cake washed with 2-butanone, and the combined filtrate evaporated. The product was purified by flash chromatography on silica gel, eluting with 5:95 v/v ethyl acetate:toluene to give methyl 3-(6-nitro-2,3-dihydrobenz-1,4-oxazin-4-ylmethyl)benzoate (0.7 g., 85%) as a yellow oil; partial NMR (80 MHz, CDCl3): 3.5(m,2H, N.CH2.CH2O); 3.9(s,3H, OMe); 4.3(m,2H, N.CH2.CH2O); 4.6(s,2H, NCH2Ar).

1. temperatureheated
2. temperatureunder reflux for 48 hours
3. customThe cooled reaction mixture
4. filtrationwas filtered
5. washthe filter cake washed with 2-butanone
6. customthe combined filtrate evaporated
7. customThe product was purified by flash chromatography on silica gel
8. washeluting with 5:95 v/v ethyl acetate