Acetic Acid → 6-Bromo-1-cyclopentyl-2-methyl-1H-benzimidazole

Participants

Reaction Steps

Heat a mixture of 4-bromo-N2-cyclopentyl-benzene-1,2-diamine (10.6 g), triethyl orthoacetate (9.5 ml) and acetic acid (6.3 mL) at 100° C. for 2.5 h. Dilute with DCM and pour onto an aqueous saturated solution of sodium bicarbonate. Dry over sodium sulfate and remove the solvent under vacuum. Purify by silica gel column chromatography, eluting with DCM/ethanol-10% NH3 (0-3%) to afford 10.67 g of the title compound. MS (ES+): m/z=280 (M+H)+.

Provenance & Evidence