Phosphorus oxychloride → 2-Chloro-5-nitro-3-(trifluoromethyl)pyridine

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-nitro-3-(trifluoromethyl)pyridin-2(1H)-one 3 (1.50 g, 7.21 mmol), POCl3 (2.76 g, 18.02 mmol) and PCl5 (1.4 g, 10.09 mmol) is heated to about 110-120° C. for 8 hours and then poured into ice water. The mixture is neutralized with solid NaHCO3 and extracted with ethyl acetate (3×40 ml). The combined organic phases is dried over Na2SO4 and all solvents removed under reduced pressure to obtain 2-chloro-5-nitro-3-(trifluoromethyl)pyridine 4.

Provenance & Evidence