反応 #47337

反応方程式

potassium carbonate

5,6,7,8-tetrahydro-naphthalen-1-ol

ethyl-2-butynoate

→

3-(5,6,7,8-tetrahydro-naphthalen-1-yloxy)-but-2-enoic acid ethyl ester

収率 72.5%

溶媒

tetrahydrofuran

反応条件

後処理

1. 1
   温度At this time, the reaction was cooled to 25° C.
2. 2
   濃縮At this time, the reaction was concentrated in vacuo
3. 3
   workup.DISSOLUTIONThe residue was dissolved in ethyl acetate (200 mL)
4. 4
   洗浄was washed with water (1×100 mL)
5. 5
   乾燥The organics were then dried over magnesium sulfate
6. 6
   ろ過filtered
7. 7
   洗浄rinsed with ethyl acetate
8. 8
   濃縮concentrated in vacuo
9. 9
   その他absorbed onto silica gel
10. 10
    その他Purification by Analogix flash chromatography (115 g, 1-10% ethyl acetate/hexanes)

実験手順

A mixture of 5,6,7,8-tetrahydro-naphthalen-1-ol (3.00 g, 20.24 mmol) and ethyl-2-butynoate (13.62 g, 121.46 mmol) in tetrahydrofuran (100 mL) was treated with potassium carbonate (3.10 g, 22.43 mmol) and 4-dimethylaminopyridine (0.26 g, 2.12 mmol). The reaction was then heated at 85° C. overnight. At this time, the reaction was cooled to 25° C. and was stirred at 25° C. overnight. At this time, the reaction was concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL) and was washed with water (1×100 mL) and a saturated aqueous sodium chloride solution (1×100 mL). The organics were then dried over magnesium sulfate, filtered, rinsed with ethyl acetate and concentrated in vacuo. The material was taken up in ethyl acetate and absorbed onto silica gel. Purification by Analogix flash chromatography (115 g, 1-10% ethyl acetate/hexanes) afforded 3-(5,6,7,8-tetrahydro-naphthalen-1-yloxy)-but-2-enoic acid ethyl ester (3.82 g, 72%) as a light yellow oil: HR-ES-MS m/z calculated for C26H34N4O5 [M+H]+ 483.2602, observed 483.2603; 1H NMR (400 MHz, DMSO-d6) δ ppm 1.11 (t, J=7.1 Hz, 3H), 1.61-1.77 (m, 4H), 2.44 (s, 3H), 2.46 (br. s., 2H), 2.76 (br. s., 2H), 3.98 (q, J=7.1 Hz, 2H), 4.57 (s, 1H), 6.84 (d, J=7.7 Hz, 1H), 7.03 (d, J=7.7 Hz, 1H), 7.18 (t, J=7.7 Hz, 1H).

出典