Phosphorus oxychloride → 8-Chloro-6-methyl-2-(methylthio)pyrido[3,4-d]pyrimidine

Participants

Reaction Steps

A solution of 6-methyl-2-(methythio)pyrido[3,4-d]pyrimidin-8(7H)-one (Preparation 51, 100 mg, 0.483 mmol) in POCl3 (5 mL) was heated to 70° C. for 1 hour. The reaction mixture was concentrated in vacuo. The residue was partitioned between EtOAc (30 mL) and washed with water (30 mL), dried (MgSO4) and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with 0-20% EtOAc in cyclohexane to give the title compound (28.4 mg, 52%).

Provenance & Evidence