Benzenesulfonyl chloride → {4-[(1-Benzenesulfonyl-1H-benzoimidazol-2-ylmethyl)-(3-methyl-pyridin-2-ylmethyl)-amino]-butyl}-carbamic acid tert-butyl ester

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To a solution of {4-[(1H-benzoimidazol-2-ylmethyl)-(3-methyl-pyridin-2-ylmethyl)-amino]-butyl}-carbamic acid tert-butyl ester (0.215 g, 0.51 mmol) in CH2Cl2 (10 mL) was added Et3N (0.30 mL, 2.15 mmol) followed by benzenesulfonyl chloride (0.13 ml, 1.02 mmol) and the resultant solution was stirred at room temperature overnight. The mixture was diluted with CH2Cl2 (40 mL), washed with brine (3×10 mL), dried (Na2SO4), and concentrated. Purification of the crude material by column chromatography on silica gel (15:1 CH2Cl2-MeOH) provided 0.202 g (70%) of {4-[(1-Benzenesulfonyl-1H-benzoimidazol-2-ylmethyl)-(3-methyl-pyridin−2-ylmethyl)-amino]-butyl}-carbamic acid tert-butyl ester as an orange-brown oil.

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