4-Fluorophenol → 4-(4-Fluorophenoxy)-3,5-difluoronitrobenzene

Participants

Reaction Steps

A mixture of 3,4,5-trifluoronitrobenzene (20.0 g, 113 mmol, commercially available from AsymChem of Durham, N.C.), dry DMF (100 ml), 4-fluorophenol (13.9 g, 124 mmol), and Cs2CO3 (56 g, 172 mmol) was stirred under N2 at 60-70° C. for 1-2 hrs. After cooling to room temperature, the reaction mixture was partitioned between H2O and EtOAc. The phases were separated and the aqueous phase was further extracted with EtOAc (2×). The EtOAc extractions were washed with sat'd NaCl (1×), dried over Na2SO4, and concentrated in vacuo to give 4-(4-fluorophenoxy)-3,5-difluoronitrobenzene (32.0 g, 105%) which was used in the next step without further purification. 1H NMR (DMSO-d6): δ7.15 (m, 2H), 7.22 (m, 2H), 8.31 (d, 2H, J=7.6 Hz).

Provenance & Evidence