反应详情

A solution of 615 mg (1.45 mmol) of 4-cyano-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole-2-carboxylic acid (2-cyclohex-1-enyl-pyridin-3-yl)-amide (as prepared in the previous step) in CH2Cl2 (12 mL) was treated with MeOH (100 μL) and TFA (3 mL) at RT for 3.5 h. MeOH (5 mL) was added to the mixture before concentrating in vacuo. RP-HPLC (C18) of the residue with 10-80% CH3CN in 0.1% TFA/H2O over 30 min afforded 177 mg (30%) of the title compound as a white solid: 1H-NMR (CD3OD; 400 MHz): δ 9.03 (dd, 1H, J=8.4, 1.6 Hz), 8.45 (dd, 1H, J=5.2, 1.6 Hz), 8.07 (s, 1H), 7.81-7.74 (m, 1H), 6.36-6.29 (m, 1H), 2.49-2.34 (m, 4H), 1.97-1.79 (m, 4H). Mass spectrum (ESI, m/z): Calcd. for C16H15N5O, 294.1 (M+H), found 294.1.

1. concentrationbefore concentrating in vacuo