Methyl iodide → 4-(5,6-Dichloro-1-methylbenzimidazol-2-yl)-N-(1,2,2,6,6-pentamethylpiperidin-4-yl)-3-methoxybenzamide

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Reaction Steps

A mixture of 4-(5,6-dichlorobenzimidazol-2-yl)-N-(1,2,2,6,6-pentamethylpiperidin-4-yl)-3-methoxybenzamid (0.16 g, 0.33 mmol), prepared as described in Example 4, and KOH (0.0185 g, 0.33 mmol) in acetone (8 ml) was stirred for 1 h at room temperature. Iodomethane (0.047 g, 0.033 mmol) was added and stirring was continued for 24 h. Solvent was removed under reduced pressure and the residue was partitioned between water and ethyl acetate. the organic layer was washed with brine, dried over Na2SO4, filtered and evaporated under reduced pressure. The crude residue was purified by column chromatography eluting with CH2Cl2/MeOH/NH4OH 95:5:0.2. Fraction containing the desired product were collected, evaporated to dryness under reduced pressure and the solid was triturated with diisopropyl ether to give 0.022 g of the title compound (yield 13%), mp=178–180° C.

Provenance & Evidence