Benzenesulfonyl chloride → (3'S)-1'-(4-{[1-(Phenylsulfonyl)-1H-benzimidazol-2-yl]methyl}-benzoyl)-1,3'-bipyrrolidine Fumarate

Participants

Reaction Conditions

Reaction Steps

A solution of (3′S)-1′-[4-(1H-benzimidazol-2-ylmethyl)benzoyl]-1,3′-bipyrrolidine (100 mg, 0.267 mmol) in anhydrous dichloromethane was cooled to 0° C. under an inert atmosphere, treated with triethylamine (TEA) (32 mg, 0.32 mmol) followed by dropwise addition of a solution of benzenesulfonyl chloride (51.7 mg, 0.293 mmol) in anhydrous dichloromethane, stirred at 0° C. for 1 h, warmed to room temperature for 1 h and concentrated under reduced pressure. The resultant residue was partitioned between dichloromethane and 5% aqueous NaHCO3. The organic phase was separated, washed with water, dried over sodium sulfate and concentrated under reduced pressure to give a residue. This residue was treated with fumaric acid in dichloromethane/methanol to afford the title compound, 1H NMR (300 MHz, DMSO-d6, +TFA): 7.96 (d, 1 H), 7.90 (d, 2 H), 7.78-7.66 (m, 2 H), 7.59 (m, 2 H), 7.49 (d, 2 H), 7.45-7.29 (m, 4 H), 6.63 (s, 2 H), 4.67 (s, 2 H), 3.58-3.41 (m, 4 H), 3.10-2.76 (m, 5 H), 2.19 (m, 1 H), 2.00 (m, 1 H), 1.91-1.73 (m, 4 H). [M+H] 515.1

Provenance & Evidence