[CH3:1][O:2][C:3]1[N:8]=[C:7]([NH2:9])[N:6]=[C:5]2[NH:10][N:11]=[CH:12][C:4]=12.C([O-])(=O)C.[Na+].[I:18]Cl.S(S([O-])=O)([O-])(=O)=O.[Na+].[Na+]>O>[I:18][C:12]1[C:4]2[C:5](=[N:6][C:7]([NH2:9])=[N:8][C:3]=2[O:2][CH3:1])[NH:10][N:11]=1
A mixture of compound 4 (105 g, 0.636 mol), sodium acetate (263 g) and iodine monochloride (140 g) was mechanically stirred in 1.3 L of water at a temperature between 92-98° C. for 5 h. The mixture was cooled to room temperature and a solution of sodium metabisulfite (139 g in 500 ml of water) was added. The mixture was stirred for 10 minutes and then filtered. The solid was rinsed with water and dried. The resulting dried solid was dissolved in 840 ml of hot DMF and precipitate by addition of 800 ml of water. The mixture was cooled in an ice-bath and the solid was filtered and dried to provide 144 g (78% yield) of 3-iodo-4-methoxy-6-aminopyrazolo[3,4-d]pyrimidine (5).
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