A novel synthesis of 2-substituted 2H-imidazo[1,5-<Emphasis Type="Italic">b</Emphasis>]isoquinoline-1,5-diones by <Emphasis Type="Italic">in situ</Emphasis> desulfurization

A novel synthesis of 2-substituted 2H-imidazo1,5-b]isoquinoline-1,5-diones by reductive desulfurization of a variety of 2-substituted 3-thioxo-2H-imidazo1,5-b]isoquinoline-1,5-diones is reported with nickel boride in dry methanol at ambient temperature. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 404–408, March, 2008.