p-Toluenesulfonic acid → HCID 178419326, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-bromo-benzene-1,2-diamine (3.0 g, 16.1 mmol) in anhydrous toluene (50 ml) was added a solution of 3-cyclohexyl-acryloyl chloride (as prepared in STEP B above, 32.5 mmol) in toluene (5 ml). The resulting solution was stirred at 40° C. for 6 h. To the resulting solution was added p-toluenesulfonic acid (3.0 g, 16 mmol) and heated to reflux for 18 h. The resulting solution was concentrated. The residue obtained was partitioned between ethyl acetate and a saturated solution of sodium bicarbonate. The layers were separated. The organic layer was washed successively with saturated sodium bicarbonate, water, brine, then dried over sodium sulfate, filtered and concentrated. The residue was chromatographed using a silica gel to yield 5-bromo-2-(2-cyclohexyl-vinyl)-1H-benzoimidazole.

Provenance & Evidence