Reaktion #2171

Reaktionsgleichung

dimethylcarbonate

sodium hydride

5-chloroindanone

hydrogen

→

desired product

Ausbeute 45.0%

2-carbomethoxy-5-chloroindanone

Ausbeute 45.0%

Lösungsmittel

dimethoxyethane

dimethoxyethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added dropwise at room temperature
2. 2
   TemperaturThe reaction was cooled to room temperature
3. 3
   Sonstigequenched with 100 ml H2O
4. 4
   Extraktionextracted with ethyl ether (3×100 ml)
5. 5
   ExtraktionThe ether extract
6. 6
   Waschenwas washed with brine (100 ml)
7. 7
   Trocknendried over anhydrous MgSO4

Vorschrift

To a mixture of sodium hydride (2.4 g, 60% in mineral oil, 0.06 mole) and 50 ml dry dimethoxyethane, 5-chloroindanone (50 g, 0.03 mole) in 50 ml dimethoxyethane was added dropwise at room temperature. The mixture was stirred at room temperature until hydrogen evolution ceased. Then dimethylcarbonate (27 g, 0.3 mole) was added dropwise at room temperature and the reaction was heated to 60° C. for one hour. The reaction was cooled to room temperature, quenched with 100 ml H2O, acidified to pH 5 with concentrated HCl and extracted with ethyl ether (3×100 ml). The ether extract was washed with brine (100 ml), dried over anhydrous MgSO4 and stripped to yield 3.0 g (45%) of the desired product as a tan solid.

Quelle