3-Hydroxypyridine → HCID 24902674, compound

Temperature

-20 °C

To 315 mg (1.2 mmol) of PPh3 in 5 mL of dry THF at −20° C. was added 189 μL (1.2 mmol) of DEAD dropwise. The solution was allowed to stir 10 min. at −20° C. After 10 min, a solution containing 173 mg (1 mmol) of N-Boc-3-hydroxyazetidine and 2 mL of dry THF was added dropwise. The solution was again allowed to stir 10 min at −20° C. After 10 min, to the solution was added 95 mg (1 mmol) of 3-hydroxypyridine at once. The solution was then slowly heated to 70° C. and allowed to stir at 70° C. overnight. Next day, solvent was removed under reduced pressure. The crude product was purified by flash chromatography (2:1, Hexane:Ethyl Acetate) to obtain 160 mg (64% yield) of a yellow oil: 1H NMR (300 MHz, CD3OD) δ8.27 (1H, d, J=4.8 Hz), 8.18 (1H, d, J=2.7 Hz), 7.23 (1H, m), 7.05 (1H, m), 4.92 (1H, m), 4.34-4.00 (2H, AB, J=6.6, 9.7 Hz), 1.45 (9H, s).

1. waitAfter 10 min
2. additionwas added dropwise
3. stirringto stir 10 min at −20° C
4. waitAfter 10 min
5. temperatureThe solution was then slowly heated to 70° C.
6. stirringto stir at 70° C. overnight
7. customNext day, solvent was removed under reduced pressure
8. customThe crude product was purified by flash chromatography (2:1, Hexane:Ethyl Acetate)

ORD record

ord-4156f376554940329717e5f41ac6e6b7

Source dataset

uspto-grants-2003_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06562847B1