Diethyl Ether → Ethyl 2-(2-bromopyrimidin-5-yl)acetate

Temperatur

101.5 °C

Bromotrimethylsilane (1.7 mL, 12 mmol) was added to a solution of (2-chloro-pyrimidin-5-yl)acetic acid ethyl ester (Example 43-(2); 810 mg, 4.04 mmol) in propionitrile (4 mL), and the mixture was heated under reflux at an external temperature of 98 to 105° C. for nine hours. After cooling the reaction mixture to room temperature, diethyl ether was added to the reaction mixture, which was neutralized with a 2 N sodium hydroxide aqueous solution (6.3 mL). The reaction mixture was extracted with diethyl ether. The organic layer was dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel chromatography (hexane/ethyl acetate=2/1) to give the title compound (897 mg, 91%).

1. temperaturethe mixture was heated
2. temperatureAfter cooling the reaction mixture to room temperature
3. extractionThe reaction mixture was extracted with diethyl ether
4. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel chromatography (hexane/ethyl acetate=2/1)

ORD-Eintrag

ord-2e2011b630ac49d9a214f5afece34942

Quelldatensatz

uspto-grants-2011_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07935688B2