Tetramethyl orthocarbonate → 4-benzyloxy-2-methoxy-1-methyl-1H-benzimidazole

Participants

Reaction Steps

To a stirred solution of 2-amino-3-benzyloxy-N-methylaniline (318.5 mg) in acetic acid (3.2 ml) was added tetramethyl orthocarbonate (223.0 μl) at ambient temperature, and the reaction mixture was stirred for 4 hours. The reaction mixture was concentrated in vacuo, and to the residue were added ethyl acetate and a saturated sodium bicarbonate solution. The organic layer was washed with water and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo. The residue was triturated with n-hexane-diisopropyl ether to give 4-benzyloxy-2-methoxy-1-methyl-1H-benzimidazole (273.3 mg) as a pale brown solid.

Provenance & Evidence