Hydrochloric Acid → 3-Hydroxy-6-iodoquinoline-4-carboxylic acid

5-iodoindoline-2,3-dione (50 g, 183 mmol) was dissolved in a hot solution containing potassium hydroxide (82 g, 1465 mmol) and water (250 mL). The reaction mixture was in homogeneous solution for 5 min then was precipitated out completely. Enough ethanol (30 ml) was added to redissolve the reaction mixture. After cooled to rt and mechanically stirred, 3-bromo-2-oxopropanoic acid hydrate (47 g, 256 mmol) was added portionwise—tremendous heat was generated (>80° C.). After the addition, the reaction mixture was cooled to rt and continued to stir for 3 days. The reaction mixture was treated with sat. solution of NaHSO3 (sodium bisulfate, 12 g, 115.32 mmol) in order to prevent the development of color in the product. The resulting mixture was then acidified to pH=2 using concentrated HCl. After stirred for 1 h, the yellow ppt. that was formed in the solution mixture was collected by filtration. The solid was washed with water and suspended in water with SO2 bubbling in the solution. After 30 minutes the solid again was separated by filtration. This wet solid was suspended in water, stirred, and dissolved by gradual addition of solid Na2CO3. The solution was treated with a saturated solution of NaHSO3 and filtered. The filtrate was acidified to pH=2 using concentrated HCl. The solid that was formed in the solution mixture was collected by filtration. The solid was washed with water, then resuspended in water, and again filtered. The solid was suspended in EtOH, separated by filtration, and airdried to afford the desired product as a brown solid. MS m/z: 316.2 (M+H). Calc'd. for C10H6INO3-315.06.

1. customthen was precipitated out completely
2. additionEnough ethanol (30 ml) was added
3. dissolutionto redissolve the reaction mixture
4. temperatureheat
5. custom(>80° C.)
6. additionAfter the addition
7. temperaturethe reaction mixture was cooled to rt
8. stirringto stir for 3 days
9. stirringAfter stirred for 1 h
10. customthat was formed in the solution mixture
11. filtrationwas collected by filtration
12. washThe solid was washed with water
13. customAfter 30 minutes the solid again was separated by filtration
14. stirringstirred
15. dissolutiondissolved by gradual addition of solid Na2CO3
16. additionThe solution was treated with a saturated solution of NaHSO3
17. filtrationfiltered
18. customThe solid that was formed in the solution mixture
19. filtrationwas collected by filtration
20. washThe solid was washed with water
21. filtrationagain filtered
22. customseparated by filtration

ORD-Eintrag

ord-91a5c095ac5a43d78eef6b0c6ae63176

Quelldatensatz

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08524900B2