tert-butyl {2-[(4-{2-[3-(2-methyl-1H-benzimidazol-1-yl)-8-azabicyclo[3.2.1]oct-8-yl]ethyl}-4-phenyl piperidin-1-yl)carbonyl]phenyl}sulfonylcarbamate → 4-chloro-2-[(4-{2-[3-(2-methyl-1H-benzimidazol-1-yl)-8-aza bicyclo[3.2.1]oct-8-yl]ethyl}-4-phenylpiperidin-1-yl)carbonyl]-N-propylbenzenesulfonamide

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The title compound was prepared from a mixture of 5-chloro-2-[(propylamino) sulfonyl]benzoic acid and 3-chloro-4-[(propylamino) sulfonyl]benzoic acid 2e and endo 2-methyl-1-(8-[2-(4-phenylpiperidin-4-yl)ethyl]-8-azabicyclo[3.2.1]oct-3-yl)-1H-benzimidazole dihydrochloride II following the general procedure for tert-butyl {2-[(4-{2-[3-(2-methyl-1H-benzimidazol-1-yl)-8-azabicyclo[3.2.1]oct-8-yl]ethyl}-4-phenylpiperidin-1-yl)carbonyl]phenyl}sulfonylcarbamate 1c. The desired regioisomer was purified by column chromatography on silica gel eluting with 10% methanol in ethyl acetate to afford 4-chloro-2-[(4-{2-[3-(2-methyl-1H-benzimidazol-1-yl)-8-aza bicyclo[3.2.1]oct-8-yl]ethyl}-4-phenylpiperidin-1-yl)carbonyl]-N-propylbenzenesulfonamide 5 as a white solid (15 mg, 11% yield). 1H NMR (400 MHz, CDCl3) δ (8.12, 1H, J=8.0 Hz), 7.65 (m, 1H), 7.52 (m, 1H), 7.41-7.12 (m, 9H), 5.10 (t, 1H, J=6.0 Hz), 4.59 (m, 1H), 4.20 (m, 1H), 3.48-3.19 (m, 6H), 2.89 (q, 1H, J=6.6 Hz), 2.56 (s, 3H), 2.55-2.32 (m, 3H), 2.17 (m, 1H), 1.93-1.64 (m, 10H), 1.61 (m, 1H), 1.50 (m, 2H), 0.882 (t, 3H, J=7.3 Hz). ES-LCMS m/z 690.33 (M+2H). Analytical HPLC (Method Y) Rt 5.39 (93.34%).

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