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Short Paper | Regular issue | Vol 96, No. 7, 2018, pp.1266-1274
Published online, 28th June, 2018
DOI: 10.3987/COM-18-13913
Water Assisted and Choline Chloride-Dimethylurea Deep Eutectic Salts as Catalyst towards the Attractive Reaction of Indole, Benzaldehyde, and Malononitrile

Hongli Ruan, Yue Lv, Shijun Yu, Chengwei Lv,* and Yue An*

*School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China


The condensation of indole, benzaldehyde, and malononitrile was relatively rigorous compared with other Yonemitsu type reaction. We described a strategy using catalytic amount of choline chloride-dimethylurea deep eutectic salts as cheap and safe accelerator. We also found that introducing right amount of water in reaction system was crucial. This method tolerates variations in all three components to get desired 3-substituted indoles in satisfactory yields.