Dichloromethane → 3-Nitro-2'-trifluoromethyl-biphenyl-4-ylamine

Participants

Reaction Conditions

Reaction Steps

4-Bromo-2-nitroaniline (10.1 g, 46.7 mmol), 2-trifluoromethylphenylboronic acid (1.3 eq., 11.5 g, 60.7 mmol), and (dppf)PdCl2.DCM (0.05 eq., 1.91 g, 2.34 mmol) were placed in a 500 mL round-bottom flask equipped with a magnetic stir bar. The vial was evacuated and backflushed with Ar, and DME (180 mL) and 2M aq Na2 CO3 (60 mL) were added via syringe. The flask was capped tightly, and the reaction was stirred at 90° C. for 16 h. The reaction was cooled to RT, diluted with EtOAc, and washed sequentially with water and brine. The organic extract was dried over anhydrous MgSO4, filtered, and the solvent was removed under reduced pressure. The crude product was dry-loaded onto 25 g of SiO2 and purified by column chromatography using an 80-g SiO2 pre-packed column eluting with EtOAc/hexanes, 0:1 to 3:7, v/v over 20 min, yielding 12.8 g (97%) of the desired compound. 1H-NMR (400 MHz, CDCl3) δ: 8.11 (d, J=2.0 Hz, 1H), 7.75 (d, J=7.8 Hz, 1H), 7.54-7.62 (m, J=7.6 Hz, 1H), 7.44-7.53 (m, J=7.8 Hz, 1H), 7.36 (dd, J=8.6, 1.3 Hz, 1H), 7.33 (d, J=7.6 Hz, 1H), 6.84 (d, J=8.6 Hz, 1H).

Provenance & Evidence