Diphosgene → 3-(1-isopropyl-7-(methylthio)-2-oxo-1,2-dihydropyrimido[4,5-d]pyrimidin-3(4H)-yl)-5-nitrobenzonitrile

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Reaction Steps

Diphosgene (5 mL, 41 mmol), 3-((4-(isopropylamino)-2-(methylthio)pyrimidin-5-yl)methylamino)-5-nitrobenzonitrile (2.2 g, 6.15 mmol) and Et3N (2.5 mL) were combined by the procedure of Example A4 step 3 to give 3-(1-isopropyl-7-(methylthio)-2-oxo-1,2-dihydropyrimido[4,5-d]pyrimidin-3(4H)-yl)-5-nitrobenzonitrile (1.2 g, 51% yield), which was used in the next step without further purification.

Provenance & Evidence