تفاعل #44012

معادلة التفاعل

HCl

4-methoxylpyridine

CbzCl

ethylmagnesium bromide

→

82

المردود 89.9%

benzyl 2-ethyl-4-oxo-3,4-dihydropyridine-1(2H)-carboxylate

المردود 89.9%

المذيبات

toluene

toluene

ظروف التفاعل

المعالجة

1. 1
   workup.WAITAfter 1 hr
2. 2
   أخرىThe mixture was separated
3. 3
   غسيلthe organic layer was washed with sat. NaHCO3 and brine
4. 4
   أخرىIt was dried
5. 5
   تركيزconcentrated

الإجراء التجريبي

To a solution of 4-methoxylpyridine 81 (4.41 g, 40.5 mmol) in toluene (200 mL) at −20° C. was added CbzCl (5.7 ml, 40.5 mmol) in toluene (200 mL) dropwise. After 15 min, ethylmagnesium bromide (23 mL, 2M in THF, 46 mmol) was added dropwise. After 1 hr, 10% aqueous HCl (100 mL) was added and the mixture stirred overnight. The mixture was separated and the organic layer was washed with sat. NaHCO3 and brine. It was dried and concentrated to afford 82 (9 g, 36.4 mmol, 89.9%) that was used directly in the next reaction.

المصدر