Phosphorus oxide (P4O10) → 2-(2-Chloro-5-nitrophenyl)oxazole

Participants

Reaction Conditions

Reaction Steps

Under nitrogen, phosphorus pentoxide (0.98 g, 6.90 mmol) was added portionwise to a slurry of 2-chloro-N-(2,2-dimethoxy-ethyl)-5-nitro-benzamide (0.5 g, 1.73 mmol) in methanesulfonic acid (5 mL) at r.t. The mixture was heated to 140-145° C. for 6 h. After cooling to r.t., the mixture was poured onto ice-water and extracted with ethyl acetate. The combined organic phases were washed with water then brine, dried over sodium sulfate, filtered and concentrated in vacuo. Further drying under high vacuum gave 2-(2-chloro-5-nitrophenyl)-oxazole (0.366 g, 94%) as a solid.

Provenance & Evidence