Iodoethane → (2R)-1-(tert-butoxycarbonyl)-4-ethylpiperazine-2-carboxylic acid

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Reaction Steps

To (2R)-1-(tert-butoxycarbonyl)piperazine-2-carboxylic acid (1.406 g) and Na2CO3 (2.59 g) was added dry EtOH (28 ml) then ethyl iodide (0.54 ml) and the mixture heated at reflux for 18 h under argon. The solvent was then removed under reduced pressure and 5% MeOH/DCM (40 ml) was added and stirred for 1 hour in a sealed flask. The solution was filtered and washed with dichloromethane (2×10 mL). The filtrate was then placed directly onto a 120 g-silica cartridge and was purified using eluent 10-70% MeOH/DCM. After evaporation, the product was isolated as a white foam (1.00 g), which was used without further purification.

Provenance & Evidence