Diisopropylethylamine → 1-[4-(3,3-Dimethyl-butyl)-piperazin-1-yl]-4-[2-methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenoxy]-butan-1-one

Participants

Reaction Steps

HBTU (101 mg, 0.27 mmol) was added to a solution of 4-[2-methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenoxy]-butyric acid from E76.2 (71 mg, 0.17 mmol) and 1-(3,3-dimethyl-butyl)-piperazine dihydrochloride from Example E4 (54 mg, 0.22 mmol) in dichloromethane (10 ml) and DIEA (0.15 ml, 0.86 mmol). 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 flash chromatography on silica gel (eluant; 6% methanol:94% dichloromethane) to give a white powder identified as the title compound (52 mg, 53%).

Provenance & Evidence