反应详情

A solution of 95.0 mg (0.210 mmol) of 4-cyano-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole-2-carboxylic acid [2-(4,4-dimethyl-cyclohex-1-enyl)-pyridin-3-yl]-amide (as prepared in the previous step) in CH2Cl2 (15 mL) was treated with MeOH (1 drop) and TFA (1 mL). The mixture was stirred at RT for 2 days, and the solvents were evaporated in vacuo. Silica gel chromatography of the residue on a 20-g Isolute SPE column with 25% EtOAc-hexane and RP-HPLC (C18) with 10-80% CH3CN in 0.1% TFA/H2O over 30 min afforded 36.0 mg (39%) of the title compound as a white solid: 1H-NMR (CD3OD; 400 MHz): δ 9.02 (dd, 1H, J=8.4, 1.6 Hz), 8.44 (dd, 1H, J=5.2, 1.6 Hz), 8.06 (s, 1H), 7.76-7.71 (m, 1H), 6.22 (sept, 1H, J=2.0 Hz), 2.50-2.43 (m, 2H), 2.18-2.13 (m, 2H), 1.65 (t, 2H, J=6.4 Hz), 1.11 (s, 6H). Mass spectrum (ESI, m/z): Calcd. for C18H19N5O, 322.1 (M+H), found 322.1.

1. customthe solvents were evaporated in vacuo