Sulfuryl chloride → Ethyl 3-(2,4-dichlorophenyl)-3-oxopropanoate

HRID 1660563Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1660563
[Cl:1][C:2]1[CH:15]=[CH:14][C:5]([C:6]([CH2:8][C:9]([O:11][CH2:12][CH3:13])=[O:10])=[O:7])=[CH:4][CH:3]=1.S(Cl)([Cl:19])(=O)=O>C(Cl)(Cl)Cl>[Cl:19][C:4]1[CH:3]=[C:2]([Cl:1])[CH:15]=[CH:14][C:5]=1[C:6]([CH2:8][C:9]([O:11][CH2:12][CH3:13])=[O:10])=[O:7]

Komponenten

4

Edukt 2

HCID 24648Sulfuryl chlorideHCID 101336Ethyl 3-(4-chlorophenyl)-3-oxopropanoate

Produkt 1

HCID 542007Ethyl 3-(2,4-dichlorophenyl)-3-oxopropanoateAusbeute 107,2 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6212ChloroformLösungsmittel

Versuchsvorschrift

To a cold (5° C.) vigorously stirred mixture of 121.87 g (0.936 mole) of ethyl acetoacetate, 314 ml. of benzene and 626 ml. of water was added 41.25 ml. of 33% sodium hydroxide. To the above mixture was added simultaneously, in two dropping funnels, 177.0 g (1.01 mole) of p-chlorobenzoyl chloride and 188.8 ml. of 33% sodium hydroxide in 2 hours. The reaction mixture became pasty. The reaction mixture was heated at 35° C. for 1 hour, cooled and filtered to give 170.0 g of sodium salt of ethyl 2-benzoylacetoacetate. Part (150 g) of this salt was added to a mixture of 39.0 g (0.729 mole) of ammonium chloride and 78 ml. of concentrated ammonium hydroxide in 780 ml. of water. The mixture was stirred at 40°-50° C. for 3 hours and cooled in an ice bath. The precipitate was filtered to give 115.5 g of yellow solid which was Kugelrohr distilled to give 76.0 g (38% based on ethyl acetoacetate) of crude ethyl p-chlorobenzoylacetate. A mixture of 40.0 g (0.175 mole) of crude ethyl p-chlorobenzoylacetate, 24.2 g (0.18 mole) of sulfuryl chloride and some chloroform was held at reflux for 6 hours, cooled and concentrated to give 49.0 g of crude ethyl 2-chloro-p-chlorobenzoylacetate. A mixture of 46.0 g (0.174 mole) of crude ethyl 2-chloro-p-chlorobenzoylacetate, 13.25 g (0.174 mole) of thiourea, and 174 ml. of ethanol was held at reflux for 2 hours and cooled. The precipitate was filtered and neutralized with saturated sodium bicarbonate. The insoluble material was filtered to give 37.0 g (80%) of ethyl 2-amino-4-p-chlorophenyl-5-thiazolecarboxylate, m.p. 198°-200° C.

Aufarbeitung

  1. distillationdistilled
  2. customto give 76.0 g (38% based on ethyl acetoacetate) of crude ethyl p-chlorobenzoylacetate
  3. temperatureat reflux for 6 hours
  4. temperaturecooled
  5. concentrationconcentrated

Quellen und Nachweise

ORD-Eintrag
ord-ad0a3b4ddc98422bb89617d8e8668d39
Quelldatensatz
uspto-grants-1981_12
Patentnummer
US04308391

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