Oxonium, triethyl-, hexafluorophosphate(1-) (1:1) → tert-butyl 3-ethoxy-5,6-dihydropyrazine-1(2H)-carboxylate

Participants

Reaction Steps

Triethyloxonium hexafluorophosphate (3.20 g, 28.0 mmol) was added to a solution of tert-butyl 3-oxopiperazine-1-carboxylate (2.54 g, 12.7 mmol) in CH2CL2 (31.7 mL) at 0° C., and the resulting solution was stirred at room temperature for 18 hours. The reaction mixture was washed with saturated NaHCO3, dried (Na2SO4), and concentrated to give tert-butyl 3-ethoxy-5,6-dihydropyrazine-1(2H)-carboxylate as an oil. LCMS (APCI+) M+H−t−Bu: 173 (40%); rt=3.14 minutes.

Provenance & Evidence