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

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Reaction Steps

A mixture of 0.5 g 2,7-Diamino-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidine from Example 1 and 15 mL of n-butyl isocyanate is refluxed for 2 hours. The reaction mixture is allowed to cool to room temperature and the insoluble material filtered. The solid is recrystallized several times from ethanol to give the title compound; mp 200°-202° C.

Provenance & Evidence