1-Methyl-2-formyl-5-bromopyrrole 1 was prepared in 48% total yield by initial bromination of the intermediate 1-methyl-2-(5,5-dimethyl-1,3-dioxan-2-yl)pyrrole 5 with N-bromosuccinimide to give the intermediate 1-methyl-2-(5,5-dimethyl-1,3-dioxan-2-yl)-5-bromopyrrole 6, which was finally hydrolyzed to the product 1.
R. Hai-Ying He and X. Jiang, J. Chem. Res. (S), 1998, 786 DOI: 10.1039/A803388I
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