Sodium hydride → 8-chloro-5-cyclopropyl-5H-chromeno[3,4-c]pyridine

Temperatur

0 °C

To a suspension of NaH (389 mg, 9.72 mmol) in THF (9 mL) cooled to 0° C., was added (4-(4-chloro-2-fluorophenyl)pyridin-3-yl)(cyclopropyl)methanol (900 mg, 3.24 mmol) in THF (9 mL) dropwise over a period of 10 min. The reaction mixture was stirred at 0° C. for 15 min and then warmed to room temperature and stirred for 15 h. The reaction mixture was quenched by addition of cold water (10 mL) and extracted with ethyl acetate (3×25 mL). The combined organic extracts were washed with brine (1×25 mL), dried over sodium sulfate and concentrated under reduced pressure. The crude residue was purified via silica gel column chromatography (ethyl acetate/hexanes) to give 8-chloro-5-cyclopropyl-5H-chromeno[3,4-c]pyridine (630 mg, 2.45 mmol, 75% yield). LCMS (ESI) m/e 258.0 [(M+H)+, calcd for C15H13ClNO 258.1]; LC/MS retention time (Method C): tR=2.08 min.

1. temperaturewarmed to room temperature
2. stirringstirred for 15 h
3. customThe reaction mixture was quenched by addition of cold water (10 mL)
4. extractionextracted with ethyl acetate (3×25 mL)
5. washThe combined organic extracts were washed with brine (1×25 mL)
6. dry with materialdried over sodium sulfate
7. concentrationconcentrated under reduced pressure
8. customThe crude residue was purified via silica gel column chromatography (ethyl acetate/hexanes)

ORD-Eintrag

ord-7e1a035927334e4387de5f541334e4dd

Quelldatensatz

uspto-grants-2014_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08703953B2