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

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Reaction Steps

Following the general procedure of Example 2, 0.502 g of 6-(2,3-dichlorophenyl)-pyrido[2,3-d]-pyrimidine-2,7-diamine from Example 83 was reacted with 0.206 mL of tert-butyl isocyanate. The product is purified by silica gel chromatography eluting with a gradient of CHCl3 :EtOAc (98:2) to CHCl3 :EtOAc (1:2) to afford the title compound; mp 356-358° C.

Provenance & Evidence