1,2-Dibromoethane → HCID 86693046, compound

Participants

Reaction Conditions

Reaction Steps

Into a 20-L 4-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen was placed a solution of 4-bromo-5-fluoro-2-(1H-imidazol-2-yl)phenol (755 g, 2.94 mol, 1.00 equiv) in N,N-dimethylformamide (7.5 L), Cs2CO3 (3350 g, 10.28 mol, 3.50 equiv), followed by the addition of 1,2-dibromoethane (2208 g, 11.75 mol, 4.00 equiv). The resulting solution was stirred overnight at 80° C. To this was added 1,2-dibromoethane (200 g). The resulting solution was stirred at 80° C. for 5.5 h. This reaction was repeated for 2 times. The reaction mixture was cooled to room temperature and diluted with 20 L of ice/water. The solids were collected by filtration, washed with 2×4 L of water and dried to afford 1870 g (crude) of 9-Bromo-8-fluoro-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene as a gray solid.

Provenance & Evidence