反应 #554609

反应方程式

Ethyl 4,6-dichloro-4-fluoro-3-(3-ethoxy-3-oxopropyl)-1H-indole-2-carboxylate

lithium hydroxide trihydrate

→

3-(2-Carboxyethyl)-4,6-dichloro-4-fluoro-1H-indole-2-carboxylic acid

收率 95.0%

溶剂

tetrahydrofurane

water

THF

反应条件

后处理

1. 1
   workup.STIRRINGto stir at rt for 24 h
2. 2
   其他was removed under reduced pressure
3. 3
   萃取the product was extracted with diethyl ether (3×15 ml)
4. 4
   干燥The organic layers were dried over magnesium sulfate
5. 5
   过滤filtered
6. 6
   其他evaporated to dryness
7. 7
   其他to yield a light-beige-colored solid in 95-100% yield

实验过程

Ethyl 4,6-dichloro-4-fluoro-3-(3-ethoxy-3-oxopropyl)-1H-indole-2-carboxylate (1.13 g, 3 mmol) was dissolved in 15 ml tetrahydrofurane (THF) with stirring at rt. Then a solution of 0.38 g of lithium hydroxide trihydrate (3 equiv.) in 15 ml water was added and the resulting mixture was let to stir at rt for 24 h. After completion of the reaction THF was removed under reduced pressure and the pH was adjusted to 4-5, and the product was extracted with diethyl ether (3×15 ml). The organic layers were dried over magnesium sulfate, filtered, and evaporated to dryness to yield a light-beige-colored solid in 95-100% yield. mp. 292-294° C. 1H-NMR (DMSO-d6) δ 2.48 (m, 2H, 2′-H); 3.48 (m, 2H, 1′-H); 7.49 (dd, 1H, 2J=6 Hz, 7-H); 11.98 (s, 1H, NH); 12.72 (b, 2H, 2CO2H). 13C-NMR (DMSO-d6) δ 20.1 (C-2′); 36.1 (C-1′); 112.5 (C-7); 113.0, 113.2, 117.6, 117.7, 121.3, 121.4 (C-5); 122.3 (C-4); 127.7 (C-6); 132.5 (C-3); 147.2 (C-3a); 149.0 (C-2); 162.5 (2′-CO2H), 173.6 (2-CO2H). LC-MS (m/z): 337 [M-NH4+]+, 320 [M]+, 318 [M]−. Purity (LC-MS): 98.6%.

来源