tert-Butyl isocyanate → 1-(2-Amino-6-pyridin-3-yl-pyrido[2,3-d]pyrimidin-7-yl)-3-tert-butyl-urea

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Reaction Steps

By following the procedure of Example 2, 0.30 g of 2,7-diamino-6-(3-pyridyl)-pyrido[2,3-d]pyrido[2,3-d]-pyrimidine from Example 107 was reacted with 0.16 mL of tert-butyl isocyanate. The product was purified by medium pressure chromatography using silica gel and eluting with 90:10:1 EtOAc:MeOH:TEA to afford the title compound; mp >300° C.; CIMS (1% ammonia in methane): m/z (relative intensity) 338 (MH+ +1, 8), 339 (MH+ +2, 1), 84 (100).

Provenance & Evidence