反应详情

Prepared as described above in Example 1 starting with 4-chloro-2-methylthio-5-pyrimidinecarboxylate and benzylhydrazine to give the intermediate pure 1-benzyl-6-methylsulfanyl-1,2-dihydro-pyrazolo[3,4-d]pyrimidin-3-one. The synthesis then follows as in Examples 2 and 3 to give 1-benzyl-3-bromo-6-methylsulfanyl-1H-pyrazolo[3,4-d]pyrimidine. To a solution of 1-benzyl-3-bromo-6-methylsulfanyl-1H-pyrazolo[3,4-d]pyrimidine (334 mg, 1 mmol) in chloroform (15 mL) was added 3-chloroperoxybenzoic acid (549 mg, 3 mmol, 3 eq) and the reaction mixture was allowed to stir for 5 hours at room temperature. To the reaction mixture were then added 10 mL of 1 M Na2CO3 solution and the layers were separated. The organic layer was washed with water, dried over MgSO4 and evaporated to give 1-benzyl-3-bromo-6-methanesulfonyl-1H-pyrazolo[3,4-d]pyrimidin-3-one (291 mg, 78% yield); LC/MS (m/e)=369.0 (MH+), Rt=1.95 min.

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