Abstract
Inorganic base promoted highly selective N-hydroxymethylation of indole and its derivatives have been developed. It provided a simple method for the preparation of N-hydroxymethyl indoles with polyformaldehyde as reagents under the metal- and Lewis acid-free reaction conditions. The reaction proceeded smoothly using K2CO3 as base in 1,4-dioxane to produce the corresponding N-hydroxymethyl indoles with 62%->99% yields.
Keywords: Indoles, hydroxymethylation, polyformaldehyde, base-promoted, functionalization, highly selective.
Graphical Abstract
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