2,4-Difluorophenylhydrazine hydrochloride → 8-Bromo-2-[2-(2,4-difluoro-phenyl)-5-methyl-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene

Participants

Reaction Conditions

Reaction Steps

8-Bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carboxylic acid [1-dimethylamino-eth-(E)-ylidene]-amide (0.0162 mol) was dissolved in Acetic acid (50 mL). 2,4-Difluorophenylhydrazine hydrochloride (3.52 g, 0.0195 mol) was added and the reaction was stirred at 95° C. overnight. The acetic acid was removed in vacuo. The crude was loaded as a solid onto silica gel and purified by flash chromatography (4-10% methanol in methylene chloride) to afford 3.662 g 8-Bromo-2-[2-(2,4-difluoro-phenyl)-5-methyl-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene as an orange solid. MS (ESI+) 458.0/460.0

Provenance & Evidence