Reaktion #53607

Reaktionsgleichung

methyl 3-nitro-benzoate

methyl chioroacetate

hydrochloric acid

potassium tert.butoxide

→

Methyl 4-methoxycarbonylmethyl-3-nitro-benzoate

Lösungsmittel

dimethylformamide

water

dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe solution is stirred for 0.5 hours
2. 2
   Sonstigethe precipitate obtained
3. 3
   Filtrationfiltered
4. 4
   Waschenwashed with water
5. 5
   SonstigeThe product is recrystallised from 150 ml of methanol
6. 6
   Sonstigedried in vacuo at 40° C

Vorschrift

54.3 g of methyl 3-nitro-benzoate and 29.0 g of methyl chioroacetate are dissolved in 100 ml of dimethylformamide and this solution is added dropwise at −10° C. to a solution of 78.5 g of potassium tert.butoxide in 500 ml of dimethylformamide. The mixture is stirred for another 10 minutes at ambient temperature and after this time the solution is poured onto 350 ml of concentrated hydrochloric acid in 2 l of iced water. The solution is stirred for 0.5 hours and the precipitate obtained is suction filtered and washed with water. The product is recrystallised from 150 ml of methanol and dried in vacuo at 40° C. Yield: 48.3 g (51% of theoretical), contains about 20% of methyl 6-methoxycarbonylmethyl-3-nitro-benzoate

Quelle