Reaktion #347685

Reaktionsgleichung

7-undecene

diethyl 2-(3-bromopropionamido)malonate

→

diethyl 2-oxopyrrolidine-5,5-dicarboxylate

Ausbeute 37.3%

Lösungsmittel

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenAt the end of this time, the reaction mixture was concentrated by evaporation under reduced pressure
2. 2
   workup.ADDITIONpoured into water
3. 3
   Extraktionextracted with diethyl ether
4. 4
   WaschenThe extract was washed with 5% w/v aqueous hydrochloric acid, with a 5% w/v aqueous solution of sodium bicarbonate and with water, in that order
5. 5
   Trocknendried over anhydrous magnesium sulfate
6. 6
   SonstigeThe solvent was then removed by distillation under reduced pressure
7. 7
   Sonstigeto give a crude product
8. 8
   SonstigeThis was purified by column chromatography through silica gel
9. 9
   Wascheneluted with a 2:1 by volume mixture of cyclohexane and ethyl acetate

Vorschrift

2(b) 314 μl of 1,8-diaza[5.4.0]-7-undecene were added to a solution of 620 mg of diethyl 2-(3-bromopropionamido)malonate (prepared as described above) dissolved in methylene chloride, and the mixture was stirred at room temperature for 3 hours. At the end of this time, the reaction mixture was concentrated by evaporation under reduced pressure, poured into water and then extracted with diethyl ether. The extract was washed with 5% w/v aqueous hydrochloric acid, with a 5% w/v aqueous solution of sodium bicarbonate and with water, in that order, and dried over anhydrous magnesium sulfate. The solvent was then removed by distillation under reduced pressure, to give a crude product. This was purified by column chromatography through silica gel, eluted with a 2:1 by volume mixture of cyclohexane and ethyl acetate, to give 171 mg of diethyl 2-oxopyrrolidine-5,5-dicarboxylate.

Quelle