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A catalyst-free, solvent-promoted and scalable three-component Mannich-type reaction of indoles, aromatic aldehydes and secondary amines for the synthesis of 3-(1-dialkylaminoalkyl)-1H-indoles has been developed. The protocol provided a mild, simple and highly atom-economic alternative to prepare the title compounds, and the corresponding products could be obtained in good to excellent yields in most cases.

Catalyst-free, Solvent-promoted and Scalable Multicomponent Synthesis of 3-Aminoalkylated Indoles via a Mannich-type Reaction