Catalyst- and solvent-free approach to 2-arylated quinolines <i>via</i> [5 + 1] annulation of 2-methylquinolines with diynones

A novel route for the synthesis of 2-arylated quinolines through a [5 + 1] annulation directly from 2-methylquinolines and diynones under catalyst-free and solvent-free conditions was disclosed. This synthetic process was atom-economic, with good tolerance of a broad range of functional groups, and with great practical worth.

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