4-Chlorophenyl isothiocyanate → Ethyl 1-{[(4-chlorophenyl)amino]thioxomethyl}piperidine-4-carboxylate

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A mixture of 4-chlorophenyl isothiocyanate (3.5 g, 20.7 mmol), and ethyl isonipecotate (3.19 mL, 20.7 mmol) in dichloromethane (30 mL) was stirred at room temperature for 1 hour. The mixture was concentrated under reduced pressure, the residue was triturated with ether and the resulting solid was filtered off and dried to afford the title compound as a white solid, 6.27 g.

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