2-Pyridinecarboxamide → HCID 66876839, compound

Temperature

-10 °C

Picolinamide (0.500 g, 16 mmol) was dissolved in THF (25 mL) and cooled to −10° C. To the solution, lithium diisopropyl amide (5.1 mL, 2.0 M in heptane/THF/ethyl benzene, 10 mmol) was added dropwise. The resulting mixture was stirred at −10° C. for 15 minutes then treated with phenyl chloroformate (1.69 mL, 12.3 mmol) in THF (5 mL). After 20 minutes the reaction was warmed to room temperature and stirred for 3 hours at which time the reaction was quenched with saturated aqueous ammonium chloride. The mixture was extracted with EtOAc and the combined organic layer was dried over anhydrous sodium sulfate, filtered and concentrated. The residue was purified by silica gel chromatography (20-50% EtOAc in heptane) to provide the desired product (0.504 g). 1H NMR (400 MHz, CDCl3) δ ppm 7.18-7.26 (m, 3H) 7.34-7.41 (m, 2H) 7.54 (ddd, J=7.63, 4.78, 1.23 Hz, 1H) 7.92 (td, J=7.74, 1.70 Hz, 1H) 8.28 (dt, J=7.82, 1.09 Hz, 1H) 8.62 (ddd, J=4.77, 1.67, 0.93 Hz, 1H) 10.47 (s, 1H).

1. temperatureAfter 20 minutes the reaction was warmed to room temperature
2. stirringstirred for 3 hours at which time the reaction
3. customwas quenched with saturated aqueous ammonium chloride
4. extractionThe mixture was extracted with EtOAc
5. dry with materialthe combined organic layer was dried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by silica gel chromatography (20-50% EtOAc in heptane)

ORD record

ord-95ad512cf96b482fb1b96f298b621271

Source dataset

uspto-grants-2011_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08044052B2