تفاعل #4014

معادلة التفاعل

ethacrolein

diethyl 3-chloro-2-oxo-butanedioate

ammonium sulfamate

→

title product

المردود 86.0%

diethyl 5-ethylpyridine-2,3-dicarboxylate

المردود 86.0%

المذيبات

ethanol

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةis heated
2. 2
   درجة الحرارةat reflux
3. 3
   أخرىthe solvent removed by distillation under reduced pressure
4. 4
   workup.ADDITIONThe residue is treated with water
5. 5
   استخلاصextracted with ethyl acetate
6. 6
   أخرىThe organic phase is separated
7. 7
   تركيزconcentrated in vacuo
8. 8
   أخرىthe residue purified by column chromatography on silica gel using 4:1 hexane-ethyl acetate as the eluent

الإجراء التجريبي

A stirred mixture of ethacrolein, (4.2 g, 0.05 mol), diethyl 3-chloro-2-oxo-butanedioate, (11.2 g, 0.05 mol) and ammonium sulfamate, (15.4 g, 0.135 mol) in ethanol (37 mL) is heated at reflux. After 15 hours the mixture is cooled to room temperature and the solvent removed by distillation under reduced pressure. The residue is treated with water and extracted with ethyl acetate. The organic phase is separated and concentrated in vacuo and the residue purified by column chromatography on silica gel using 4:1 hexane-ethyl acetate as the eluent to give 10.8 g (75% yield) of the title product as an oil which is shown to be 95% pure by a gas chromatography assay.

المصدر