2-chloro-1-(2-ethoxyethyl)-1H-benzimidazole → HCID 67672022, compound

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Reaction Steps

(±)-1,1-dimethylethyl trans-4-amino-2-(phenylmethyl)-1-piperidinecarboxylate (5 g), 1-(2-ethoxyethyl)-2-chloro-1H-benzimidazole (4.5 g) and copper (1.28 g) were stirred at 150° C. for 4 hours. The mixture was taken up in CH2Cl2 and filtered. The filtrate was washed with water/NH3. The organic layer was dried, filtered and the solvent evaporated. The residue was purified by column chromatography over silica gel (eluent: CH2Cl2 /(CH3OH/NH3) 98/2). The pure fractions were collected and the solvent evaporated, yielding 6 g (73.7%) of (±)-1,1-dimethylethyl trans-4-[[1-(2-ethoxyethyl)-1H-benzimidazol-2-yl]amino]-2-(phenylmethyl)-1-piperidine-carboxylate (interm. 6).

Provenance & Evidence