Magnesiation Employing Grignard Reagents and Catalytic Amine. Application to the Functionalization of N-Phenylsulfonylpyrrole

[reaction: see text] N-Phenylsulfonylpyrrole 1 is magnesiated by treatment with isopropylmagnesium chloride and catalytic diisopropylamine. Reaction with various electrophiles, including palladium-catalyzed aryl- and heteroaryl cross-coupling, provides 2-substituted phenylsulfonylpyrroles in moderate to good yields.