反应详情

To a solution of commercially available 4-chloro-3-(trifluoromethyl)aniline (15.0 g, 76.7 mmol) in anhydrous THF (200 mL) cooled to 0-5° C. was added triethylamine (11.7 mL, 84.4 mmol) followed by pivaloyl chloride (10.4 mL, 84.4 mmol) over 30 min. The ice bath was removed and the mixture stirred at rt for 1 h. The mixture was diluted with ether and filtered. The filtrate was washed with water (2×) and brine, dried (MgSO4), filtered and concentrated. The residue was triturated with hexanes and the solid was filtered and dried under vacuum to afford compound 18A (20.4 g, 95%); MS (ES) m/z 280 [M+1]+.

1. customThe ice bath was removed
2. additionThe mixture was diluted with ether
3. filtrationfiltered
4. washThe filtrate was washed with water (2×) and brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was triturated with hexanes
9. filtrationthe solid was filtered
10. customdried under vacuum