Hydroxylamine → HCID 15287762, compound

Participants

Reaction Steps

Hydroxylamine free base (50% aqueous solution, 2.0 g, 30.3 mmol) is added dropwise to diethyl maleate (4.41 g, 25.6 mmol) and stirred for 60 minutes to give diethyl N-hydroxyaspartate. Toluene (25.02 g) and p-toluenesulfonic acid (0.05 g, 0.26 mmol) are added to the reaction mixture and refluxed for 4.5 hours to afford diethyl 2-aminomaleate. The reaction mixture is cooled to room temperature and added acetic acid (7.0 g) and 2-ethylacrolein (2.13 g, 25, 0 mmol). The reaction mixture is stirred at 80°-90° C. for 24 hours. It is concentrated under reduced pressure and analyzed by GLC using an external standard. The analysis showed the yield of diethyl 5-ethylpyridine-2,3-dicarboxylate is about 35%.

Provenance & Evidence