Potassium Carbonate → N-(tert-Butyl)-1-(cyclohexylmethyl)-1H-pyrrole-3-sulfonamide

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To a solution of compound 27d (29.4 g, 146 mmol), bromocyclohexylmethane (30.9 g, 175 mmol), K2CO3 (40.2 g, 291 mmol) in dry DMF (300 mL) was heated at 85° C. overnight, quenched with water and extracted with EA twice. The combined organic layers were washed with water (3×) and brine, concentrated and purified by CC (PE/EA=2/1) to give compound 27e (17.8 g, 41%) as a solid.

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