Diisopropylethylamine → 1-(4-Cyclobutylmethyl-piperazin-1-yl)-2-[2-methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenyl]-ethanone

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Reaction Steps

WSCD (76 mg, 0.39 mmol) and DMAP (7 mg, 0.06 mmol) were added to a solution of 4-[2-(4-cyclobutylmethyl-piperazin-1-yl)-2-oxo-ethyl]-3-methyl-benzoic acid from Example E85.2 (100 mg, 0.30 mmol) and 3-methyl-3,4,9,10-tetrahydro-2,3,4,9-tetraaza-benzo[f]azulene from Example E11 (61 mg, 0.30 mmol) in dichloromethane (20 ml) and DIEA (0.16 ml, 0.91 mmol). The mixture was heated at reflux for 20 h and concentrated in vacuo. The residue was purified by flash chromatography on silica gel (eluant; 4% methanol:96% dichloromethane to 6% methanol:94% dichloromethane to 1% 35% ammonia:7% methanol:92% dichloromethane) to give an off-white solid identified as the title compound (50 mg, 32%).

Provenance & Evidence