Ethyl isothiocyanatoformate → 3-[(6-Phenoxypyridin-3-yl)methyl]-2-thioxo-1,2,3,7-tetrahydro-6H-purin-6-one

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Reaction Steps

Ethoxycarbonyl isothiocyanate (0.096 mL, 0.85 mmol) was added to 4-{[(6-phenoxypyridin-3-yl)methyl]amino}-1H-imidazole-5-carboxamide (0.25 g, 0.81 mmol, obtained from Example 25(a)) in anhydrous dichloromethane (3.0 mL). After stirring for 2.5 h at ambient temperature the mixture was concentrated to dryness. Sodium hydroxide (10 mL, 2% w/v) was added and the solution was heated at 50° C. over night. After cooling, the pH was adjusted to 4-5 using 2N HCl. The solid was collected by filtration and recrystallized from DMSO/water to give a white crystalline material. A portion of this material was recrystallized from MeOH to give 35 mg (0.10 mmol, 12% yield) of the title compound.

Provenance & Evidence