Regioselective Synthesis of 3‐Substituted Pyrroles by Nucleophilic Addition of 3‐(1‐Arylsulfonylalkyl) Pyrroles Activated under Basic or Acid Conditions
Conditioned pyrroles! Sulfonylpyrroles, obtained regioselectively from commercial N‐triisopropylsilylpyrrole, undergo removal of the arylsulfonyl group under basic or acidic conditions to give vinylogous imino‐like derivatives (see scheme; TIPS=triisopropylsilyl). These electrophilic intermediates react with nucleophilic reagents to give 3‐functionalizedpyrroles.