Reaktion #50564

Reaktionsgleichung

ethyl 5-methoxy-indole-2-carboxylate

sodium hydride

ethylacrylate

ethyl acrylate

sodium hydride

→

2,3-dihydro-1-oxo-7-methoxy-2-ethoxycarbonyl-1H-pyrrolo[1,2-a]indole

Lösungsmittel

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe mixture was heated to reflux
2. 2
   SonstigeAfter a total of 8 hr, the starting material was consumed completely
3. 3
   Sonstigethe mixture was quenched with ethanol
4. 4
   workup.ADDITIONtreated with water and dilute HCl and methylene chloride
5. 5
   WaschenThe organic layer was washed with brine
6. 6
   Sonstigedried
7. 7
   Einengenconcentrated

Vorschrift

A stirred solution of ethyl 5-methoxy-indole-2-carboxylate (30 g, 137 mmol) in 1.5 L of toluene under N2 was treated with sodium hydride (6.7 g of 60% in oil, 167 mmol) and ethylacrylate (16.3 ml, 150 mmol). The mixture was heated to reflux. After 3 hours (hr), additional ethyl acrylate (3 ml) and sodium hydride (3.3 g) were added. After a total of 8 hr, the starting material was consumed completely and the mixture was quenched with ethanol and treated with water and dilute HCl and methylene chloride. The organic layer was washed with brine, dried and concentrated to give 2,3-dihydro-1-oxo-7-methoxy-2-ethoxycarbonyl-1H-pyrrolo[1,2-a]indole, which was used directly in the next step.

Quelle