Piperidine → (E)-tert-butyl 2-cyano-3-(3,4-dichlorophenyl)acrylate

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A solution of tert-butyl cyanoacetate (2.52 ml, 17.63 mmol), 3,4-dichlorobenzaldehyde (2.57 g, 14.69 mmol) and piperidine (0.145 ml, 1.469 mmol) in EtOH (50 ml) was allowed to stir at 80° C. for 15 hours, and then cooled to ambient temperature. A half volume of the solvent was evaporated, and 400 ml of water was added to the resulting mixture. The precipitated solid was collected and washed with 5% iPrOH/H2O (200 ml). The solid was dried under reduced pressure to give (E)-tert-butyl 2-cyano-3-(3,4-dichlorophenyl)acrylate (3.577 g); Retention time=1.61 minutes (condition A); MS (ES+)=315.1 (m+18).

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