Реакция #66817

Уравнение реакции

isoxazol-5-ylacetonitrile

Isoxazol-5-ylacetonitrile

tert-butyl 4-oxopiperidine-1-carboxylate

ammonium acetate

→

title compound

Выход 54.6%

tert-Butyl 4-[cyano(isoxazol-5-yl)methylidene]piperidine-1-carboxylate

Выход 54.6%

Растворители

toluene

Условия реакции

Обработка

1. 1
   Температураwas heated for 8 h
2. 2
   Температураto reflux
3. 3
   ЭкстракцияSubsequently, the mixture was extracted with water
4. 4
   Сушкаdried over sodium sulfate
5. 5
   Другоеthe solvent was removed in vacuo
6. 6
   ДругоеThe crude product was purified by column chromatography on silica gel (eluent: cyclohexane/ethyl acetate 2:1)
7. 7
   Другоеto yield an oil, which
8. 8
   Другоеprecipitated upon treatment with petroleum ether/tert-butyl methyl ether

Методика

A mixture of isoxazol-5-ylacetonitrile from Example 48A (3.00 g, 27.8 mmol), tert-butyl 4-oxopiperidine-1-carboxylate (5.53 g, 27.8 mmol) and ammonium acetate (4.28 g, 55.5 mmol) in toluene (50 mL) was heated for 8 h to reflux. Subsequently, the mixture was extracted with water, dried over sodium sulfate, and the solvent was removed in vacuo. The crude product was purified by column chromatography on silica gel (eluent: cyclohexane/ethyl acetate 2:1) to yield an oil, which precipitated upon treatment with petroleum ether/tert-butyl methyl ether to yield 4.38 g (54.6%) of the title compound as yellowish crystals.

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