Some studies are reported on the preparation of a new class of substituted 5-(2-pyridinyl) pyrimidines, starting with cyano (2-pyridinyl) ketenedithioacetal. This has been reacted with amidines under base-catalysed conditions, giving a variety of different products, the structures of which have been determined. Synthesis of two novel tricyclic systems,(29) and (30), have also been developed.
