3-Acetyl-5-bromopyridine → HCID 68671419, compound

Temperature

-78 °C

To a solution of methoxymethyltriphenylphosphonium chloride (20.57 g, 60 mmol) in THF at −78° C. was added slowly butyl lithium (1.6 M in hexanes, 37.5 mL). The resulting mixture was further stirred for 45 min to room temperature. After the reaction was cooled down to −78° C., 1-(5-bromopyridin-3-yl)ethanone (Aldich) (8 g, 40 mmol) in THF was added to the reaction mixture. The resulting solution was stirred from −78° C. to room temperature for overnight, then quenched with saturated aqueous NH4Cl solution, and extracted with diethyl ether three times. The combined organic layers were washed with brine, dried with anhydrous Na2SO4, and concentrated to a residue which was purified by flash column to give 3-bromo-5-(1-methoxyprop-1-en-2-yl)pyridine (E/Z mixture, 5 g). 1H NMR (300 MHz, CDCl3), d: 8.769 (m, 0.5H), 8.491 (m, 1.5H), 8.143 (m, 0.4H), 7.737 (m, 0.6H), 6.517 (m, 0.6H), 6.271 (m, 0.4H), 3.804, 3.773 (ss, 3H), 1.949 (m, 3H). The aldehyde was synthesized using the methods described herein.

1. stirringThe resulting solution was stirred from −78° C. to room temperature for overnight
2. customquenched with saturated aqueous NH4Cl solution
3. extractionextracted with diethyl ether three times
4. washThe combined organic layers were washed with brine
5. dry with materialdried with anhydrous Na2SO4
6. concentrationconcentrated to a residue which
7. customwas purified by flash column

ORD record

ord-c6840f16ef5040ff9a432cb9b460e355

Source dataset

uspto-grants-2012_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08299267B2