Nicotinic Acid → Ethyl 3-oxo-3-(pyridin-3-yl)propanoate

To a suspension of nicotinic acid 5.00 g (40.6 mmol) in tetrahydrofuran 50 mL was added carbonyl diimidazole 9.76 g (60.9 mmol) at 5° C. and stirred at room temperature for 1 hour. In a separate flask, a suspension of MgCl2 4.64 g (48.7 mmol) and ethyl malonate potassium salt 10.37 g (60.92 mmol) in tetrahydrofuran 50 mL was stirred at 50° C. for 4 hours. To this suspension was added the aforementioned imidazolide solution at room temperature and stirred for 12 hours. The reaction was quenched by the addition of water and extracted into ethyl acetate. The organic layer was washed by brine, dried over MgSO4, filtrated and the solvent was evaporated. Silica gel chromatography (n-hexane/AcOEt=2/1) afforded the title compound 3.89 g as pale yellow oil. Yield 49.5%.

1. stirringwas stirred at 50° C. for 4 hours
2. stirringstirred for 12 hours
3. customThe reaction was quenched by the addition of water
4. extractionextracted into ethyl acetate
5. washThe organic layer was washed by brine
6. dry with materialdried over MgSO4
7. filtrationfiltrated
8. customthe solvent was evaporated

ORD 기록

ord-52e00cba3a7b469181a511ba17c706ed

출처 데이터셋

uspto-grants-2012_03

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US08129386B2