反应详情

Alternatively, a mixture of hexahydro-1H-1,4-diazepine (17.47 g, 174.4 mmol) and methyl 4-(bromomethyl)benzoate (5.0 g, 21.8 mmol) was heated with triethylamine (24 mL, 174.4 mmol) in tetrahydrofuran (872 mL) to reflux for three hours. After cooling, the mixture was treated with saturated sodium bicarbonate solution. The mixture was extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate, and concentrated under reduced pressure. Flash chromatography gave 3.04 g of methyl 4-[(hexahydro-1H-1,4-diazepin-1-yl)methyl]benzoate, 1H NMR (300 MHz, CDCl3) δ 7.98 (d, 2H), 7.42 (d, 2H), 3.90 (s, 3H), 3.70 (s, 2H), 2.97 (m, 2H), 2.91 (m, 2H), 2.67 (m, 2H), 2.66 (m, 2H), 1.77 (m, 2H).

1. temperatureto reflux for three hours
2. temperatureAfter cooling
3. extractionThe mixture was extracted with ethyl acetate
4. washThe organic layer was washed with brine
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated under reduced pressure