Iodine → N-(4-(aminomethyl)-3-chlorophenyl)methanesulfonamide

Temperatur

0 °C

In a three-neck round-bottom flask containing a 0° C. solution of LiAlH4 (2M in THF) (26.0 mL, 52.0 mmol) was added iodine (6.60 g, 26.0 mmol) in THF (20 mL) dropwise under N2. After addition, the mixture was stirred for 30 min at 0° C. N-(3-chloro-4-cyanophenyl)methanesulfonamide (4 g, 17.34 mmol) in THF (20 mL) was then added dropwise. After addition, the reaction mixture was warmed to room temperature and stirred for 1 h, during which time precipitate crashed out of the solution. The reaction mixture was filtered, and the cake washed with cold THF. The cake was carefully transferred to a beaker which contained 60 mL of THF. The mixture was acidified to pH=2 with 6N HCl with constant stirring at 0° C. The layers were separated and the aqueous layer was washed with DCM (30 mL). The aqueous layer was concentrated by rotary evaporation. The resulting solids were washed with cold MeOH to give a yellow solid. The mother liquid was subjected to the same workup (2×). The combined crops were collected and dried to give the title compound as the HCl salt (4.2 g, 89%). MS (ES+): m/e 234.7 [M+H]+.

1. additionAfter addition
2. additionAfter addition
3. temperaturethe reaction mixture was warmed to room temperature
4. stirringstirred for 1 h, during which time precipitate
5. filtrationThe reaction mixture was filtered
6. washthe cake washed with cold THF
7. stirringwith constant stirring at 0° C
8. customThe layers were separated
9. washthe aqueous layer was washed with DCM (30 mL)
10. concentrationThe aqueous layer was concentrated by rotary evaporation
11. washThe resulting solids were washed with cold MeOH
12. customto give a yellow solid
13. customThe combined crops were collected
14. customdried

ORD-Eintrag

ord-6537eae5c7a8453484da45bee500b057

Quelldatensatz

uspto-grants-2012_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08212032B2