Diisopropylethylamine → 4-{3-[2-Methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenoxy]-propyl}-piperidine-1-carboxylic Acid Tert-butyl Ester

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Reaction Steps

PyBroP (224 mg, 0.48 mmol) and DMAP (39 mg, 0.32 mmol) were added to a solution of 4-[3-(4-carboxy-2-methyl-phenoxy)-propyl]-piperidine-1-carboxylic acid tert-butyl ester from Example E68.3 (120 mg, 0.32 mmol) and 3-methyl-3,4,9,10-tetrahydro-2,3,4,9-tetraaza-benzo[f]azulene from Example E11 (70 mg, 0.35 mmol) in dichloromethane (5 ml) and DIEA (0.111 ml, 0.64 mmol). The mixture was heated at reflux for 2 days, 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% dichloro-methane) to yield the title compound (71 mg, 40%).

Provenance & Evidence