Potassium Carbonate → 3-Chloro-5-ethynylpyridine

Temperature

0 °C

3-Chloro-5-[(triethylsilyl)ethynyl]pyridine (1.4 g, 6.7 mmol) was dissolved in methanol (15 ml) and cooled to 0° C., to the resulting solution was added potassium carbonate (93 mg, 0.67 mmol). The ice bath was removed and the reaction mixture was stirred at ambient temperature for 0.5 h at which time thin layer chromatography (TLC) and GC/MS analysis indicated that the reaction was complete. The solvent was removed in vacuo and the residue was dissolved in diethyl ether (50 mL), washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo to afford 3-chloro-5-ethynylpyridine (822 mg, 90% yield) which was pure by GC/MS analysis. MS (EI ionization) 137 (35Cl M+), 139 (37Cl M+). This material was carried on to the next step without further purification.

1. customThe ice bath was removed
2. customThe solvent was removed in vacuo
3. dissolutionthe residue was dissolved in diethyl ether (50 mL)
4. washwashed with water (100 mL), brine (100 mL)
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo

ORD record

ord-8e607dfcc0c84a9d882b94b9005b2290

Source dataset

uspto-grants-2004_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06774138B2