Oxalyl chloride → 1-[4-(3,3-Dimethyl-butyl)-piperazin-1-yl]-3-[4-(3,4-dimethyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-2-methyl-phenyl]-propan-1-one

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Reaction Steps

Oxalyl chloride (0.018 ml, 0.20 mmol) was added to a solution of 3-[4-(3,4-dimethyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-2-methyl-phenyl]-propionic acid from Example E80.2 (40 mg, 0.10 mmol) in dichloromethane (5 ml) and a few drops of DMF. The mixture was stirred for 1 h at room temperature, concentrated in vacuo and azeotroped with toluene. The residue was dissolved in dichloromethane (5 ml) and 1-(3,3-dimethyl-butyl)-piperazine dihydrochloride from Example E4 (30 mg, 0.12 mmol) and DIEA (0.052 ml, 0.30 mmol) were added. The mixture was stirred for 20 h at room temperature, washed with saturated NaHCO3 then brine, dried and concentrated in vacuo. The residue was purified by preparative HPLC (eluant; 0.5% 35% ammonia:9.5% methanol:90% dichloromethane) to give a white powder identified as the title compound (36 mg, 65%).

Provenance & Evidence