Methylamine → 8-Bromo-2-[2-(2,2,2-trifluoro-ethyl)-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene

Participants

Reaction Conditions

Reaction Steps

To a solution of 8-Bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid amide 25 (10.76 g, 0.03308 mol) in toluene (200 mL) was added methanamine, 1,1-Dimethoxy-N,N-dimethyl-(19.683 g, 0.1640 moles). The reaction was heated to 95° C. for 3 hours. The toluene was removed in vacuo to give a beige powder. The crude (12.58 g, 0.03308 mol) was redissolved in acetic acid (120 mL) and trifluoroethyl hydrazine (6.269 mL, 0.04962 mol) was added. The reaction was heated to 95° C. for 4 h. The AcOH was removed in vacuo. The product was loaded as a solid onto silica and purified by flash chromatography (5-70% EtOAc in hexanes). The appropriate fractions were combined and concentrated to give 8-Bromo-2-[2-(2,2,2-trifluoro-ethyl)-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene (6.176 g) as an off-white solid. MS(ESI+) 431.0/433.0.

Provenance & Evidence