反应详情

A mixture of N-(9-bromo-1,2-dihydro-10-nitro-1-oxobenzo[f]quinazolin-3-yl)pivalamide (0.8 g, 1.9 mmoles) and iron powder (0.44 g, mmoles) in ethanol:glacial acetic acid/1:1 (25 ml) was stirred and heated to reflux under a nitrogen atmosphere for 3 hours. The reaction mixture was poured into chloroform:water/2:1 (150 ml) and neutralized by addition of solid sodium bicarbonate. The chloroform layer was separated, and the aqueous phase was washed twice with chloroform (50 ml each). Combined chloroform layers were dried over sodium sulfate, filtered and evaporated under reduced pressure. The crude product was purified on a silica gel column eluting with chloroform to give N-(10-amino-9-bromo-1,2-dihydro-1-oxobenzo[f]quinazolin-3-yl)pivalamide as a bright yellow solid. (0.66 g, 89%) 1H NMR (DMSO-d6, 200 MHz) δ: 1.27(s, 9H, t-butyl); 6.51(s, 2H, NH2); 7.22(d, J=8.4 Hz, 1H, Ar); 7.51(br d, J=9 Hz, 1H, Ar); 7.72(d, J=8.4 Hz, 1H, Ar); 8.12(d, J=9.0 Hz, 1H, Ar); 11.40(br s, 1H, NH); 12.45(br s, 1H, NH).

1. temperatureheated
2. temperatureto reflux under a nitrogen atmosphere for 3 hours
3. customThe chloroform layer was separated
4. washthe aqueous phase was washed twice with chloroform (50 ml each)
5. dry with materialCombined chloroform layers were dried over sodium sulfate
6. filtrationfiltered
7. customevaporated under reduced pressure
8. customThe crude product was purified on a silica gel column
9. washeluting with chloroform