19056-41-8, The chemical industry reduces the impact on the environment during synthesis 19056-41-8, name is 3-Bromo-4-methoxyaniline, I believe this compound will play a more active role in future production and life.
A flask containing compound QQ (0.966 g, 1.48 mmol), 4-amino-2-bromoanisole (0.35 g, 1.78 mmol), tris(dibenzylidineacetone)dipalladium(0) (0.068 g, 0.074 mmol), BINAP (0.092 g, 0.148 mmol), and sodium tert-butoxide (0.569 g, 5.92 mmol) was flushed with nitrogen, and then anhydrous o-xylene (30 mL) was added. The mixture was heated at 115 C. in an oil bath for two hours. At this time, the reaction was cooled to room temperature and the solvent was removed under reduced pressure. The brownish residue was redissolved in dichloromethane and filtered through a bed of celite. The filtrate was concentrated to dryness under reduced pressure, dissolved in THF (20 mL) and purged with nitrogen. Tetrabutylammonium fluoride (1.0 N in THF, 4.5 mL, 4.5 mmol) was added and the solution was stirred for 18 hours at room temperature. The solvent was removed under reduced pressure, and the residue partitioned between water and DCM. The organic layer was washed with saturated sodium bicarbonate and brine, dried over sodium sulfate and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica gel (1-10% MeOH in DCM) to give compound RR.
The chemical industry reduces the impact on the environment during synthesis 3-Bromo-4-methoxyaniline. I believe this compound will play a more active role in future production and life.
Reference:
Patent; Moran, Edmund J.; Jacobsen, John R.; Leadbetter, Michael R.; Nodwell, Matthew B.; Trapp, Sean G.; Aggen, James; Church, Timothy J.; US2003/229058; (2003); A1;,
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