Dimethylformamide → 2-Tert-butyl-5-chloro-3-hydroxyisoindolin-1-one

Temperature

-78 °C

A solution of N-tert-butyl4-chlorobenzamide (1.06 g, 5.00 mmol) in anhydrous THF (20 mL) was cooled to −78° C. under nitrogen. To the stirred solution was added dropwise tert-butyllithium solution in pentane (1.7M, 7.3 mL, 12.5 mmol), such that the internal temperature remained below −70° C. The resulting suspension gradually turned from pale to bright yellow. The mixture was stirred for an additional 1 hour at −78° C. DMF (1.5 mL, 19.5 mmol) was added dropwise to the slurry below −70° C. resulting in formation of a clear light yellow solution. The solution was allowed to warm to −20° C. (became colorless) before it was quenched with sat. aq. NH4Cl (10 mL) and allowed to warm to RT. The biphasic mixture was diluted with ethyl acetate (20 mL), and the layers were seperated. The organic layer was washed with water (20 mL), brine (20 mL), and dried over anhydrous MgSO4. The organic solvent was removal under reduced pressure to afford 2-tert-butyl-5-chloro-3-hydroxyisoindolin-1-one (1.18 g, 98% yield) as a colorless solid.

1. customremained below −70° C
2. customresulting in formation of a clear light yellow solution
3. temperatureto warm to −20° C. (became colorless) before it
4. customwas quenched with sat. aq. NH4Cl (10 mL)
5. temperatureto warm to RT
6. additionThe biphasic mixture was diluted with ethyl acetate (20 mL)
7. customthe layers were seperated
8. washThe organic layer was washed with water (20 mL), brine (20 mL)
9. dry with materialdried over anhydrous MgSO4
10. customremoval under reduced pressure

ORD record

ord-00aec2edc95b49f2af3b3f4f60407174

Source dataset

uspto-grants-2010_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07759337B2