Hydrogen Bromide → methyl (E)-3-(4-bromo-2,6-dichlorophenyl)acrylate

Temperatur

0 °C

4-Bromo-2,6-dichloroaniline (5, 80 g) was dissolved in acetone (640 mL), and a 48% hydrogen bromide aqueous solution (120 mL) was added, followed by stirring at 0° C. A sodium nitrite (32 g) aqueous solution (160 ml,) was added dropwise thereto, the mixture was stirred for 30 minutes, and methyl acrylate (200 nit), and water (200 mL) were added, followed by stirring for 1 hour. At room temperature, cuprous oxide (2 g) was added, followed by stirring for 2 hours. The reaction solution was extracted with ethyl acetate, and purified by column chromatography to obtain methyl (E)-3-(4-bromo-2,6-dichlorophenyl)acrylate (48.5 g). Methyl (E)-3-(4-bromo-2,6-dichlorophenyl)acrylate (48.5 g) was dissolved in dichloromethane, an ozone gas was introduced at −70° C., and ozone oxidization was performed. To the reaction solution was added dimethyl sulfide (40 mL), and this was extracted with ethyl acetate to obtain 4-bromo-2,6-dichlorobenzaldehyde (6, 37.2 g).

1. stirringthe mixture was stirred for 30 minutes
2. stirringby stirring for 1 hour
3. stirringby stirring for 2 hours
4. extractionThe reaction solution was extracted with ethyl acetate
5. custompurified by column chromatography

ORD-Eintrag

ord-461827c04cd24ae0a2de80cddea142a2

Quelldatensatz

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08889722B2