Dimethylformamide → HCID 58760951, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-bromo-1-(4-chloro-phenyl)-2-(2-chloro-phenyl)-1H-imidazole-4-carboxylic acid ethyl ester (I-5d, 4.4 g, 0.01 mmol) in anhydrous THF (100 ml) and under a N2 atmosphere at −78° C. was slowly added tert.-butyl lithium (13 ml of 1.7 M solution in pentane, 0.22 mol). After 1 hour at −78° C., DMF (7.7 ml, 0.1 mmol) was added dropwise. The reaction mixture was stirred at −78° C. for 2.5 hours, quenched with sat'd aq. NH4Cl (10 ml), allowed to slowly warm to room temperature, and finally poured into sat'd aq. NaCl. The aqueous solution was extracted with Et2O (3×) and the combined organic extracts were dried (Na2SO4) and concentrated in vacuo. The crude residue was purified via flash chromatography using a solvent gradient of 1:3 EtOAc/hexanes to 1:1 EtOAc/hexanes to give the desired product I-5e as a pale yellow amorphous glass (2.0 g): +APCI MS (M+1) 389.2; 1H NMR (CD2Cl2) δ 1.41 (3H, t), 4.45 (2H, q), 7.09-7.14 (2H, m), 7.24-7.39 (7H, m), 10.50 (1H, s).

Provenance & Evidence