Benzoic Acid → 5-Chloro-2-phenyloxazolo[5,4-d]pyrimidine

Participants

Reaction Steps

7.82 g (64.0 mmol) Benzoic acid and 20 mL POCl3 are stirred together at 100° C. for 30 min. Within 45 min 7.00 g (42.7 mmol) 2,6-dichloro-5-aminopyrimidine are added in several portions. The reaction mixture is stirred for additional 2 h at the same temperature. After that time, the mixture is carefully added to an ice cold aq. NaOH solution. The resulting precipitate is filtered off, washed with water and dried.

Provenance & Evidence