تفاعل #1162465

معادلة التفاعل

3-oximino-2,4-pentanedione

d,l-norvaline

→

5-acetyl-4-methyl-2-propylimidazole

المردود 55.7%

المذيبات

n-butanol

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةto reflux
2. 2
   درجة الحرارةAfter 19.3 h the reaction mixture was cooled
3. 3
   ترشيحsuction filtered
4. 4
   غسيلThe residue was washed with ethyl acetate (100 ml)
5. 5
   تركيزthe combined filtrates concentrated in vacuo
6. 6
   workup.DISSOLUTIONThe resulting oil was dissolved in ethyl acetate (200 ml)
7. 7
   استخلاصextracted with three 50 ml portions of 5% aqueous sodium hydroxide solution
8. 8
   أخرىRemoval of the solvent in vacuo

الإجراء التجريبي

To 40 g (0.309 moles) of 3-oximino-2,4-pentanedione dissolved in 200 ml of n-butanol was added 39.92 g (0.341 moles) of d,l-norvaline. The resulting mixture was brought to reflux, while stirring rapidly under nitrogen with an oil bath. After 19.3 h the reaction mixture was cooled, and then suction filtered. The residue was washed with ethyl acetate (100 ml) and the combined filtrates concentrated in vacuo. The resulting oil was dissolved in ethyl acetate (200 ml) and extracted with three 50 ml portions of 5% aqueous sodium hydroxide solution. Removal of the solvent in vacuo gave 0.15 moles (55.7% yield based on recovered d,l-norvaline) of 5-acetyl-4-methyl-2-propylimidazole.

المصدر