Reaktion #42157

Reaktionsgleichung

2-chloro-meta-xylene

methyl methacrylate

dicyclohexylmethylamine

→

(E)-3-(2,6-dimethylphenyl)-2-methylacrylic acid methyl ester

Ausbeute 75.8%

Lösungsmittel

1,4-dioxane

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeA 30-ml four-necked flask was equipped with a stirrer
2. 2
   workup.ADDITIONadded into the flask
3. 3
   SonstigeThe flask was purged with argon
4. 4
   workup.STIRRINGby stirring at 120° C. for 37 hours
5. 5
   SonstigeAfter the completion of the reaction, 5 ml of toluene and 10 ml of saturated sodium chloride solution
6. 6
   workup.ADDITIONwere added
7. 7
   Sonstigefollowed by separation
8. 8
   SonstigeThe organic phase was purified by column chromatography

Vorschrift

A 30-ml four-necked flask was equipped with a stirrer, a thermometer and a reflux condenser. 0.703 g (5 mmol) of 2-chloro-meta-xylene, 1.001 g (10 mmol) of methyl methacrylate, 0.034 g (0.038 mmol) of tris(dibenzylideneacetone)dipalladium (0), 1.074 g (5.5 mmol) of dicyclohexylmethylamine and 5 ml of 1,4-dioxane were weighed in the flask, followed by stirring. Further, 0.078 g (0.15 mmol) of tri-tert-butylphosphonium tetraphenylborate obtained in Example A-1 was weighed in air and added into the flask. The flask was purged with argon, followed by stirring at 120° C. for 37 hours. After the completion of the reaction, 5 ml of toluene and 10 ml of saturated sodium chloride solution were added, followed by separation. The organic phase was purified by column chromatography to afford 0.774 g of (E)-3-(2,6-dimethylphenyl)-2-methylacrylic acid methyl ester (yield: 76 mol % based on 2-chloro-meta-xylene). The identification of the product was made by 1H-NMR and 13C-NMR.

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