반응 #51418

반응 방정식

1H-Indole-2,5-dicarboxylic acid 2-ethyl ester

HCl EtOH

→

1H-indole-2,5-dicarboxylic acid diethyl ester

수율 99.0%

반응 조건

후처리

1. 1
   기타evaporated in vacuo to dryness
2. 2
   건조The residue was freeze-dried from dioxane

실험 절차

A suspension of 1H-Indole-2,5-dicarboxylic acid 2-ethyl ester (20.0 g, 85.75 mmole) in a saturated HCl/EtOH (200 ml) was stirred at 55 C. for 24 h and evaporated in vacuo to dryness. The residue was freeze-dried from dioxane to give 22.18 g (99%) of 1H-indole-2,5-dicarboxylic acid diethyl ester, 16 as white powder. MS: 262.12 (M+H). 1-NMR (DMSO-d6): 12.23 (s, 1H, H-1, indole); 8.34 (m, 1H, H-4, indole); 7.83 (m, 1H, H-6, indole); 7.49 (m, 1H, H-7, indole); 7.30 (s, 1H, H-3, indole); 4.31 (m, 4H, —OCH2CH3); 1.32 (m, 4H, —OCH2CH3).

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