Thibault, Carl L'Heureux, Alexandre Bhide, Rajeev S. Ruel, Réjean Concise and Efficient Synthesis of 4-Fluoro-1<i>H</i>-pyrrolo[2,3-<i>b</i>]pyridine Two routes describing the preparation of 4-fluoro-1<i>H</i>-pyrrolo[2,3-<i>b</i>]pyridine (<b>4a</b>) from 1<i>H</i>-pyrrolo[2,3-<i>b</i>]pyridine <i>N</i>-oxide (<b>1</b>) are presented. Regioselective fluorination was achieved using either the Balz−Schiemann reaction or lithium−halogen exchange. Regioselective fluorination;pyrrolo;Efficient Synthesis;1 H;pyridine N 2003-12-25
    https://acs.figshare.com/articles/journal_contribution/Concise_and_Efficient_Synthesis_of_4_Fluoro_1_i_H_i_pyrrolo_2_3_i_b_i_pyridine/3355291
10.1021/ol036030z.s002