反応 #554609

反応方程式

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

収率 95.0%

溶媒

tetrahydrofurane

water

THF

反応条件

後処理

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

実験手順

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%.

出典