Reaktion #82202

Reaktionsgleichung

potassium t-butoxide

ethyl chloroacetate

ethyl formate

HCl

→

Ethyl 2-Chloro-2-formylacetate

Lösungsmittel

THF

diethyl ether

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter completion of addition
2. 2
   workup.WAITto stand overnight
3. 3
   Temperaturcooled in an ice bath
4. 4
   SonstigeThe organic phase was separated
5. 5
   Waschenthe aqueous layer was washed 3 times with diethyl ether
6. 6
   TrocknenThe combined ethereal portions were dried over NaSO4
7. 7
   Einengenconcentrated in vacuo
8. 8
   Sonstigewas stored at -30° C.
9. 9
   Sonstigeused without further purification

Vorschrift

To a three neck 2 L round bottom flask charged with potassium t-butoxide (0.5 mol, 500 mL of a 1M solution in THF) and 500 mL of dry THF cooled to 0° C. was added dropwise from an addition funnel a solution of ethyl chloroacetate (0.5 mol, 53.5 mL) and ethyl formate (0.5 mol, 40.4 mL), in 200 mL of THF over 3 hours. After completion of addition, the reaction mixture was stirred for 1 hour and allowed to stand overnight. The resulting solid was diluted with diethyl ether and cooled in an ice bath. Then, the pH was lowered to approximately 3 using 6N HCl. The organic phase was separated, and the aqueous layer was washed 3 times with diethyl ether. The combined ethereal portions were dried over NaSO4, and concentrated in vacuo. The crude desired compound was stored at -30° C. and used without further purification.

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