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0 °C

A portion of [4-(1H-benzoimidazol-2-ylmethyl)-phenyl]-(3-hydroxy-pyrrolidin-1-yl)-methanone (1.00 g, 3.1 mmol) was dissolved in dichloromethane, treated with diisopropylethylamine (0.60 g, 4.6 mmol), cooled to 0° C., treated dropwise with a solution of methanesulfonyl chloride (0.49 g, 4.3 mmol) in dichloromethane, stirred at 0° C. for 10 min. and concentrated under vacuum to provide a solid residue. Purification of this residue by column chromatography (silica, chloroform:methanol 0→5%) gave the title product as a yellow solid (62%). 1H NMR (400 MHz, CDCl3): 7.58 (m, 2H), 7.56 (m, 4H), 7.22 (m, 2H), 5.27 (d, J=5.4 Hz 1H), 4.35 (s, 2H), 3.93 (s, 1H), 3.80 (s, 1H), 3.63 (m, 4H), 3.09 (m, 3H), 2.31 (m, 2H). [M+H] 400.

1. concentrationconcentrated under vacuum
2. customto provide a solid residue
3. customPurification of this residue by column chromatography (silica, chloroform:methanol 0→5%)