A mixture of 3-[2-(6-Amino-indazol-1-yl)-ethyl]-oxazolidin-2-one (58 mg, 0.24 mmol), 4-benzyloxyphenylacetic acid (68 mg, 0.28 mmol), ethyldimethylpropylcarbodiimide hydrochloride (53 mg, 0.28 mmol), N-hydroxybenzotriazole (37 mg, 0.28 mmol) and N-methyl morpholine (60 mg, 0.56 mmol) in 3 mL of DMF was stirred at room temperature for 6 hours. The mixture was concentrated under reduced pressure and the residue was purified by flash chromatography (silica gel, ethyl acetate/triethylamine, 30/1) to provide the title compound as a pale yellow solid (58 mg, 52%); 1H NMR (300 MHz, DMSO-d6) ppm 3.39 (m, 2H), 3.55 (m, 2H), 3.61 s, 2H0, 4.09 (m, 2H), 4.47 (m, 2H), 5.09 (s, 2H), 6.67 (d, J=8.47, 2H), 7.13 (m, 1H), 7.27 (m, 2H), 7.31–7.45 (m, 5H), 7.65 (m, 1H), 7.97 (m, 1H), 8.13 (s, 1H), 10.30 (s, 1H); MS (DCI/NH3) m/z 471 [M+H]+.
