Sodium Iodide → 4-tert-Butyl-5-chloro-3,4-dihydro-1H-quinoxalin-2-one

Temperature

-78 °C

Bromoacetyl bromide (2.8 ml, 32 mmol) was added drop wise to a solution of N*2*-tert-butyl-3-chlorobenzene-1,2-diamine from Example 12B (4.1 g, 21 mmol) and diisopropylethylamine (11 ml, 63 mmol) in THF (75 ml) while cooling to −78° C. The mixture was allowed to warm to room temperature over 18 h and the solvent was evaporated. Chloroform was added and the mixture was washed with sodium hydrogen carbonate, dried and evaporated. To the residue were added acetonitrile (90 ml), diisopropylethylamine (5.6 ml, 32 mmol) and sodium iodide (3.2 g, 21 mmol). The mixture was heated at reflux for 18 h, cooled and evaporated. The residue was taken up in chloroform, washed with water, dried and evaporated. The residue was purified by flash chromatography on silica (eluant pet.ether:EtOAc 100:0 to 50:50) to give an orange solid; yield 1.5 g, 29%.

1. temperatureto warm to room temperature over 18 h
2. customthe solvent was evaporated
3. additionChloroform was added
4. washthe mixture was washed with sodium hydrogen carbonate
5. customdried
6. customevaporated
7. temperatureThe mixture was heated
8. temperatureat reflux for 18 h
9. temperaturecooled
10. customevaporated
11. washwashed with water
12. customdried
13. customevaporated
14. customThe residue was purified by flash chromatography on silica (eluant pet.ether:EtOAc 100:0 to 50:50)
15. customto give an orange solid

ORD record

ord-e8d2fa7a7b8e41168729d93262cfea04

Source dataset

uspto-grants-2011_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08063038B2