Carbon Dioxide → 1-Benzylbenzimidazole-2-carboxylic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 2.08 g (10 mmol) of 1-benzylbenzimidazole in 200 ml of dry tetrahydrofuran was cooled under N2 atmosphere to -78° C. and treated with 8.0 ml (20 mmol) of n-butyllithium. The resulting solution was warmed to 0° C. for 0.5 h, recooled to -78° C., and poured into a mixture of excess dry ice in 200 ml of tetrahydrofuran. After being allowed to warm, the solution was treated with 200 ml of water, washed with ether, neutralized, and washed with ether. The aqueous layer was concentrated in vacuo, after which the residue was triturated with 2% methanol in chloroform and filtered. The filtrate was dried over MgSO4 and concentrated to give 2.01 g (80%) of the desired compound as a white powder. Mass spectrum: (M-OH)+ =235.

Herkunft & Nachweise