A mixture of 1-[2-(2-isopropyl-5-methyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diazabenzo[e]azulen-8-yloxy]cyclopropanecarboxylic acid (90 mg, 0.22 mmol), 1-methylpiperazine (29 uL, 0.26 mmol), HATU (108 mg, 0.29 mmol) and DIPEA (52 uL, 0.31 mmol) in DMF (3 mL) was stirred at RT for 2 h. Volatiles were removed under reduced pressure and the resulting residue was partitioned between EtOAc and water. The aqueous layer was extracted with EtOAc and the combined organic layers were washed with water, followed by brine, then dried (MgSO4) and concentrated in vacuo affording {1-[2-(2-Isopropyl-5-methyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diazabenzo[e]azulen-8-yloxy]cyclopropyl}-(4-methylpiperazin-1-yl)methanone (quantitative). LCMS: RT 2.08 min [M+H]+ 492.2
