Formamide → 6-Bromopyrrolo[2,1-f][1,2,4]triazin-4-ol

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Reaction Steps

A solution of 1-amino-4-bromo-1H-pyrrole-2-carboxylic acid methyl ester (2.9 g, 13.2 mmol) in formamide (12 mL) was heated at 180° C. for 5 hrs. The mixture was diluted with ethyl acetate (300 mL), and then washed with water (100 mL*2), brine (100 mL*3). The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure. The resulting solid was washed with PE/EA (4:1, 50 mL) to give 6-bromo-3H-pyrrolo[2,1-f][1,2,4]triazin-4-one (1.4 g, yield 50%) as yellow solid. MS (ES+) requires: 213, 215. found 214, 216 [M+H]+; purity: 92%.

Provenance & Evidence