Potassium Iodide → Paliperidone

Temperature

85 °C

A mixture of 3-(2-chloroethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (formula-8) (170.1 grams), 6-fluoro-3-(4-piperidinyl)-1,2-benzoisoxazole monohydrochloride (formula-6) (150 grams), sodium carbonate (113.3 grams), and potassium iodide (9.7 grams) in acetonitrile (1.5 L) was heated to 85° C. The reaction mixture was heated at 85° C. for 6 hrs. The reaction mixture was then cooled to −10° C. and stirred for 1.5 hrs. The solid obtained was filtered, washed with cold acetonitrile. The wet solid was taken in water, and acetic acid was added to the mixture to adjust the pH to 4.0. The reaction mixture was treated with acidic carbon and filtered through hyflow bed. The filtrate was treated with sodium hydrosulphite (hydrose). The pH of the reaction mixture was adjusted to 12 by adding aqueous sodium hydroxide solution and stirred for 45 min. The solid obtained was filtered, washed with water and dried to provide the title compound.

1. temperatureThe reaction mixture was heated at 85° C. for 6 hrs
2. temperatureThe reaction mixture was then cooled to −10° C.
3. customThe solid obtained
4. filtrationwas filtered
5. washwashed with cold acetonitrile
6. additionacetic acid was added to the mixture
7. additionThe reaction mixture was treated with acidic carbon
8. filtrationfiltered through hyflow bed
9. additionThe filtrate was treated with sodium hydrosulphite (hydrose)
10. additionby adding aqueous sodium hydroxide solution
11. stirringstirred for 45 min
12. customThe solid obtained
13. filtrationwas filtered
14. washwashed with water
15. customdried

ORD record

ord-3db3d87a3600439786f66abd5edc0633

Source dataset

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08481729B2