Water → HCID 86672705, Verbindung

Reaktionsgleichung

C[O:2][CH:3](OC)[CH2:4][N:5]1[C:9]2[C:10]([C:14]([O:16][CH3:17])=[O:15])=[CH:11][CH:12]=[CH:13][C:8]=2[N:7]=[C:6]1C(C)C.O.FC(F)(F)C(O)=O>C(Cl)Cl>[O:2]=[CH:3][CH2:4][N:5]1[C:9]2[C:10]([C:14]([O:16][CH3:17])=[O:15])=[CH:11][CH:12]=[CH:13][C:8]=2[N:7]=[CH:6]1

Komponenten

Versuchsvorschrift

To a stirred solution of methyl 1-(2,2-dimethoxyethyl)-2-isopropyl-1H-benzo[d]imidazole-7-carboxylate from Step D above in methylene chloride were added water and trifluoroacetic acid and the reaction was stirred at room temperature for 2 h and then heated at reflux for 3.5 h. The reaction mixture was concentrated under reduced pressure to remove the excess trifluoroacetic acid, diluted with methylene chloride, washed with saturated aqueous sodium bicarbonate, re-extracted with methylene chloride, dried (Na2SO4), filtered, and concentrated under reduced pressure to give methyl 1-(2-oxoethyl)-1H-benzo[d]imidazole-7-carboxylate (0.2 g, 44% over two steps): 1H NMR (500 MHz, DMSO-d6) δ 9.69 (s, 1H), 7.97 (dd, J=8.0, 1.0 Hz, 1H), 7.81 (dd, J=7.5, 1.0 Hz, 1H), 7.33 (t, J=8.0 Hz, 1H), 5.48 (s, 2H), 3.84 (s, 3H); MS (ESI+) m/z 218 (M+H).