An Improved Method for the Preparation of 1-Methyl-2-formyl-5-bromopyrrole
Abstract
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.