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Journal of Flow Chemistry
Eloïc Colombo
Philippe Ratel
Laurent Mounier
, and
Fabrice Guillier


A series of substituted indole-2-carboxylic acid ethyl esters and aza-indole analogs have been prepared using continuous-flow hydrogenation. The identification of some key parameters using a design of experiments (DoE)-based approach allowed efficient optimization of each synthesis. The scale-up study for the multigram preparation of one model indole substrate showed the importance of working at steady state with the H-Cube pparatus. A new useful method for the easy preparation of substituted indoles in various quantities is presented.

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