p-Toluenesulfonyl isocyanate → 2-(4-{[5-Chloro-2-nitro-4-(trifluoromethyl)phenyl]amino}phenyl)ethyl (4-methylphenyl)sulfonylcarbamate

To a stirred solution of 2-(4-{[5-chloro-2-nitro-4-(trifluoromethyl)phenyl]amino}phenyl)ethanol (step 2 of Example 104, 1.0 g, 2.77 mmol) in dichloromethane (45 ml) was added p-toluenesulfonyl isocyanate (574 mg, 2.91 mmol), and the mixture was stirred at room temperature for 2 h. The mixture was quenched with water (100 ml). The organic layer was separated. The aqueous layer was extracted with dichloromethane (100 ml×3). The combined organic layer was washed with brine (50 ml), dried (MgSO4), and concentrated. Purification by flash column chromatography eluting with hexane/ethyl acetate (gradient elution from 2:1 to 1:1) to afford 1.51 g (98%) of the title compound as an orange solid.