反应详情

Hexamethylenetetramine (20.1 g) was added to a solution of 2-bromo-1-(4-nitrophenyl)ethanone (step A product, 25 g) in DCM (250 ml) and the mixture was stirred for 1 hour. It was then filtered and the residue was dissolved in ethanolic HCl (40 mL HCl in 162 ml EtOH). The ethanolic solution was stirred for 3 hours and was left undisturbed for 2 days. The solution was filtered and the residue was washed with water and dried to yield 11.8 g (72%) of the title compound. 1HNMR (DMSO-d6, 300 MHz): δ 8.3 (bs, 3H), 8.38 (d, 2H), 8.27 (d, 2H), 4.68 (s, 2H).

1. filtrationIt was then filtered
2. dissolutionthe residue was dissolved in ethanolic HCl (40 mL HCl in 162 ml EtOH)
3. stirringThe ethanolic solution was stirred for 3 hours
4. waitwas left undisturbed for 2 days
5. filtrationThe solution was filtered
6. washthe residue was washed with water
7. customdried