PyBroP (238 mg, 0.51 mmol) was added to a solution of 3-[2-methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenyl]-propionic acid from Example E45 (200 mg, 0.51 mmol) and 4-cyclopropylaminomethyl-piperidine-1-carboxylic acid tert-butyl ester (130 mg, 0.51 mmol) in dichloromethane (10 ml) and DIEA (0.18 ml, 1.02 mmol). The mixture was stirred for 4 days at room temperature, diluted with EtOAc, washed with 5% KHCO3 then brine, dried and concentrated in vacuo. The residue was purified by flash chromatography on silica gel (eluant; 5% methanol:95% dichloromethane) to yield the title compound (235 mg, 73%).
