反応 #2171

反応方程式

dimethylcarbonate

sodium hydride

5-chloroindanone

hydrogen

→

desired product

収率 45.0%

2-carbomethoxy-5-chloroindanone

収率 45.0%

溶媒

dimethoxyethane

dimethoxyethane

反応条件

後処理

1. 1
   workup.ADDITIONwas added dropwise at room temperature
2. 2
   温度The reaction was cooled to room temperature
3. 3
   その他quenched with 100 ml H2O
4. 4
   抽出extracted with ethyl ether (3×100 ml)
5. 5
   抽出The ether extract
6. 6
   洗浄was washed with brine (100 ml)
7. 7
   乾燥dried over anhydrous MgSO4

実験手順

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.

出典