反应详情

To a solution of 4-bromo-5-fluorobenzene-1,2-diamine (1.7 g, 8.4 mmol) in DMSO (42 mL) was added (S)-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid (1.8 g, 8.4 mmol) followed by HATU (3.5 g, 9.3 mmol) and N,N-diisopropyl-N-ethylamine (3.7 mL, 21.1 mmol), and the solution was stirred for 16 hours. The reaction mixture was diluted with EtOAc, washed with H2O and brine, dried (Na2SO4), filtered and concentrated. Acetic acid (40 mL) was added, and the mixture was stirred at 60° C. for 4 hours. Then, the reaction mixture was cooled and concentrated. The residue was azeotroped 2 times with toluene to give crude product which was purified by flash chromatography (0-50% EtOAc/hexane) to give the title compound (2.5 g, 6.4 mmol, 77%).

1. washwashed with H2O and brine
2. dry with materialdried (Na2SO4)
3. filtrationfiltered
4. concentrationconcentrated
5. additionAcetic acid (40 mL) was added
6. stirringthe mixture was stirred at 60° C. for 4 hours
7. temperatureThen, the reaction mixture was cooled
8. concentrationconcentrated
9. customThe residue was azeotroped 2 times with toluene
10. customto give crude product which
11. customwas purified by flash chromatography (0-50% EtOAc/hexane)