A solution of 163 mg (0.266 mmol) of 4-cyano-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole-2-carboxylic acid [2-cyclohex-1-enyl-4-(cis-3,5-dimethyl-piperazine-1-sulfonylmethyl)-phenyl]-amide (as prepared in the previous step) in CH2Cl2 (15 mL) was treated with EtOH (300 μL) and TFA (4.5 mL), and stirred at RT for 4 h. Solvents were evaporated in vacuo, and the residue was purified by reverse phase high pressure liquid chromatography (RP-HPLC) (C18) with 10-80% CH3CN in 0.1% TFA/H2O over 30 min to afford 8.8 mg (7%) of the title compound as a white solid: 1H-NMR (CD3OD; 400 MHz): δ 8.31 (d, 1H, J=8.4 Hz), 8.04 (s, 1H), 7.39 (dd, 1H, J=8.4, 2.0 Hz), 7.33 (d, 1H, J=2.0 Hz), 5.91-5.87 (m, 1H), 4.47 (s, 2H), 3.87-3.79 (m, 2H), 3.31-3.25 (m, 2H), 2.76-2.67 (m, 2H), 2.36-2.27 (m, 4H), 1.94-1.79 (m, 4H), 1.29 (d, 6H, J=6.4 Hz). Mass spectrum (ESI, m/z): Calcd. for C24H30N6O3S, 483.2 (M+H). found 482.9.
