Triethylamine → Benzyl ethyl piperidine-1,3-dicarboxylate

Participants

Reaction Steps

Benzyl chloroformate (Aldrich, cat #:119938) (191 mL, 1.34 mol) was slowly added to a cooled (at 0° C.) mixture of ethyl piperidine-3-carboxylate (Aldrich, cat #:194360) (200 g, 1.27 mol) and triethylamine (266 mL, 1.91 mol) in methylene chloride (1000 mL). The reaction mixture was allowed to gradually warm to ambient temperature and stirred for 3 h. The reaction was quenched by the addition of 1N HCl aq. solution and the product was extracted several times with methylene chloride. The combined extracts were washed with water, saturated aq. NaHCO3, water, brine, dried over MgSO4, filtered and concentrated under reduced pressure to afford the desired product as oil (359.8 g, 97%). LC/MS 292.2 (M+H)+.

Provenance & Evidence