Ammonium Chloride → Ethyl 3-(6-bromopyridin-3-yl)propanoate

Temperatur

0 °C

Palladium tetrakis (1.64 g, 1.41 mmol) was added to a solution of 2-bromo-4-iodopyridine (4.00 g, 14.1 mmol) in THF (28.2 ml) under an argon atmosphere. The mixture was cooled to 0° C., 3-ethoxy-3-oxopropylzinc bromide (36.6 mL, 18.3 mmol) was slowly added to the reaction mixture and stirred for 1 hour. The mixture was then allowed to warm to room temperature overnight. An aqueous ammonium chloride was added to the reaction mixture and stirred for 5 minutes. pH was then adjusted to ˜8 with aqueous sodium bicarbonate and product was extracted with ethyl acetate (3×). The combined organic layers were dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel chromatography (ethyl acetate/hexanes) to afford ethyl 3-(6-bromopyridin-3-yl)propanoate. MS ESI calc'd for C10H13BrNO2 [M+H]+ 258 and 260. found 258 and 260.

1. temperatureto warm to room temperature overnight
2. stirringstirred for 5 minutes
3. extractionwas extracted with ethyl acetate (3×)
4. dry with materialThe combined organic layers were dried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel chromatography (ethyl acetate/hexanes)

ORD-Eintrag

ord-c1ed07421c9a47a293ba9d70e4986f7b

Quelldatensatz

uspto-grants-2016_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09376418B2