Water → HCID 58118494, compound

Participants

Reaction Steps

12.2 g (58 mmol) 3-amino-6-bromo-1H-indole-2-carboxylic acid amide was suspended in 50 ml dioxan, and, after the addition of 11.7 ml (96 mmol) diphosgene, the suspension was refluxed for 2 h. Having cooled down to room temperature, 20 ml water was carefully added and the precipitate was subsequently sucked off. 13.4 g (99%) 7-bromo-1H-pyrimido[5,4-b]indole-2,4(3H,5H)-dione was obtained. ESI-MS [m/z]: 278, 280 [M−H]−

Provenance & Evidence