Phosphorus oxychloride → 7-Chlorothieno[2,3-c]pyridine

(adb) 671.5 g of thieno[2,3-c]pyridine 6-oxide hydrochloride were suspended in 4000 ml of dioxane under argon and 655 ml of phosphorus oxychloride are added. The mixture was heated on an oil-bath until the exothermic reaction set in. After the exothermic reaction faded away, the mixture was heated to reflux for an additional 10 minutes. The mixture was concentrated in vacuo and the residue was taken up in 2000 ml of toluene. The solution was then treated with 300 ml of water while cooling slowly. The mixture was neutralized by the portionwise addition of sodium carbonate. The organic phase was separated and the aqueous phase was extracted with 1000 ml of toluene. After washing with water, the combined organic solutions were dried over sodium sulfate, filtered and evaporated, whereby crude 7-chloro-thieno[2,3-c]pyridine was obtained as a brown oil.

1. temperatureThe mixture was heated on an oil-bath until the exothermic reaction
2. customAfter the exothermic reaction
3. temperaturethe mixture was heated
4. temperatureto reflux for an additional 10 minutes
5. concentrationThe mixture was concentrated in vacuo
6. additionThe solution was then treated with 300 ml of water
7. temperaturewhile cooling slowly
8. additionThe mixture was neutralized by the portionwise addition of sodium carbonate
9. customThe organic phase was separated
10. extractionthe aqueous phase was extracted with 1000 ml of toluene
11. washAfter washing with water
12. dry with materialthe combined organic solutions were dried over sodium sulfate
13. filtrationfiltered
14. customevaporated

ORD record

ord-d79cbd575e7e4a17a42c4871ed7b128c

Source dataset

uspto-grants-1988_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04735940