1: N-benzenesulfonyl-3-bromopyrrole With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; Inert atmosphere; 2: anhydrous N,N-diethylformamide in tetrahydrofuran; hexane T=-78 - 0°C; regioselective reaction;

1: N-benzenesulfonyl-3-bromopyrrole With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; Inert atmosphere; 2: anhydrous N,N-diethylformamide in tetrahydrofuran; hexane T=-78°C; regioselective reaction;

1: N-benzenesulfonyl-3-bromopyrrole With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; Inert atmosphere; 2: N,N-dimethyl-formamide in tetrahydrofuran; hexane T=-78°C; regioselective reaction;