反应详情

温度

-30 °C

To a suspension of 8-bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid amide 25 (11.44 g, 35.2 mmol) in pyridine (115 mL) at −30° C. was added phosphorus oxychloride (8.4 mL, 91 mmol) dropwise over 10 minutes. The mixture was stirred at −30° C. for 1 hour then allowed to warm to RT and stirred for 2 hours. The mixture was poured into water, stirred for 10 minutes and the solid was collected by filtration. The solid was dissolved in EtOAc and washed with copper sulfate solution. The organic layer was passed through a silica pad eluting with EtOAc and the solvent was removed in vacuo to afford 8-bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carbonitrile (7.78 g, 72%). 1H NMR δ (ppm) (DMSO-d6): 8.25 (1H, d, J=8.61 Hz), 7.38 (1H, dd, J=8.68, 2.23 Hz), 7.32-7.30 (1H, m), 4.39 (2H, t, J=5.01 Hz), 3.50-3.44 (2H, m)

1. temperatureto warm to RT
2. stirringstirred for 2 hours
3. stirringstirred for 10 minutes
4. filtrationthe solid was collected by filtration
5. dissolutionThe solid was dissolved in EtOAc
6. washwashed with copper sulfate solution
7. washeluting with EtOAc
8. customthe solvent was removed in vacuo