Triphosgene → 1-Methylpyrido[2,3-e]pyrrolo[1,2-a]pyrazin-6(5H)-one

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4-Methyl-3-(1H-pyrrol-1-yl)pyridine-2-amine (1.0 g, 5.8 mmol) and triphosgene (2.6 g, 8.7 mmol) were dissolved in 100 mL of toluene. The mixture was refluxed for 3 hours, then cooled to room temperature. The red solid was collected after filtration and washed with CH3CN 0.5 g (43%). The material was used directly for the next step reaction without purification. 1H NMR (400 MHz, DMSO) δ 11.64 (s, 1H), 8.15 (dd, J=1.4, 2.9 Hz, 1H), 8.13 (d, J=4.9 Hz, 1H), 7.20-7.08 (m, 2H), 6.75 (dd, J=2.9, 3.9 Hz, 1H), 2.81 (s, 3H).

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