Benzoic acid, 3-(chlorosulfonyl)- → 3-[(5S,9R)-9-(4-Cyanophenyl)-3-(3,5-dichlorophenyl)-1-methyl-2,4-dioxo-1,3,7-triazaspiro[4,4]nonane-7-sulfonyl]-benzoic acid

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To a mixture of 4-[(5S,9R)-3-(3,5-Dichlorophenyl)-1-methyl-2,4-dioxo-1,3,7-triazaspiro[4.4]non-9-yl]-benzonitrile (Example 15a) (0.11 g, 0.26 mmol) and (3-(Chlorosulfonyl)benzoic acid (0.058 g, 0.26 mmol) in acetone and water (1:1 mL) was added sodium bicarbonate at room temperature. The reaction mixture was stirred at room temperature for forty minutes, quenched by the slow addition of 1N hydrochloric acid (1 mL) and partitioned between DCM (2×20 mL) and brine (25 mL). The DCM layer was dried over sodium sulfate, concentrated and column purified using silica gel chromatography using DCM and MeOH to yield the titled compound (0.12 g). Retention time: 3.39 min. YMC S5 Combiscreen ODS 4.6×50 mm (4 minute gradient). Solvent A=10% MeOH, 90% water and 0.2% phosphoric acid. Solvent B=90% MeOH, 10% water and 0.2% phosphoric acid.

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