反应 #543590

反应方程式

n-butylmalonic acid

piperidine

formaldehyde

→

title compound

收率 97.5%

2-Butyl acrylic acid

收率 97.5%

溶剂

ethanol

反应条件

后处理

1. 1
   workup.DISSOLUTIONgradually redissolved over 1 hour
2. 2
   温度then cooled to room temperature
3. 3
   其他The solvents were removed under reduced pressure
4. 4
   workup.DISSOLUTIONthe residue was dissolved in ethyl acetate (200 ml)
5. 5
   洗涤washed successively with 1 M hydrochloric acid and brine
6. 6
   干燥dried over anhydrous magnesium sulfate
7. 7
   过滤filtered
8. 8
   浓缩The filtrate was concentrated

实验过程

To a solution of n-butylmalonic acid (17.2 g, 107 mmol) in ethanol (200 ml) was added piperidine (12.76 ml, 129 mmol) and 37% aq. formaldehyde (40.3 ml, 538 mmol). The solution was heated to 80° C. during which time a precipitate appeared and gradually redissolved over 1 hour. The reaction mixture was stirred at 80° C. overnight then cooled to room temperature. The solvents were removed under reduced pressure and the residue was dissolved in ethyl acetate (200 ml), washed successively with 1 M hydrochloric acid and brine, dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated to give the title compound as a clear oil (13.37 g, 97%). 1H-NMR; δ (CDCl3), 6.29 (1H, s), 5.65 (1H, s), 2.34–2.28 (2H, m), 1.54–1.26 (4H, M), 0.94 (3H, t, J=7.1 Hz).

来源