Реакция #6324

Уравнение реакции

Magnesium

ethyl indole-2-carboxylate

ammonium hydroxide

magnesium

→

title compound

(±) Methyl indoline-2-carboxylate

Растворители

methanol

Условия реакции

Обработка

1. 1
   Другоеthe mixture is placed in an ice bath
2. 2
   Другоеkept below 45°
3. 3
   Другоеis 7°
4. 4
   ЭкстракцияThe mixture is then extracted with methylene chloride (3 x)
5. 5
   СушкаThe combined organic layers are dried over magnesium sulfate
6. 6
   Концентрированиеconcentrated

Методика

Magnesium turnings (3.60 g) are added to a mixture of ethyl indole-2-carboxylate (I, Aldrich Chemical, 13.963 g) in methanol (200 ml). After evolution of gas has started, the mixture is placed in an ice bath and the temperature kept below 45°. After 4.5 hours all of the magnesium is used up and the temperature is 7°. At this time the mixture is added to ice cold hydrochloric acid (3N, 120 ml). The acidic mixture is then made alkaline (pH 10) with ammonium hydroxide (3N). The mixture is then extracted with methylene chloride (3 x). The combined organic layers are dried over magnesium sulfate and concentrated to give the title compound.

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