Trifluoroacetic acid → HCID 57803030, compound

Participants

Reaction Conditions

Reaction Steps

Crude rac-6-chloro-3-hydroxy-3-(4-isopropyl-phenyl)-1,3-dihydro-indol-2-one (0.13 g, 0.43 mmol) (from Example 53a supra) was suspended in a mixture of triethylsilane (0.15 g, 1.29 mmol) (Aldrich) and trifluoroacetic acid (0.73 g, 6.48 mmol) and heated in an 80° C. oil bath for 17 hours. After cooling to room temperature, mixture was diluted with ethyl acetate and treated with solid sodium carbonate (1 g). After stirring for 30 minutes, mixture was extracted with water and brine. Aqueous layers were back washed with ethyl acetate. Organic layers were combined, dried (Na2SO4), filtered and concentrated. Residue was recrystallized from dichloromethane-hexanes to give rac-6-chloro-3-(4-isopropyl-phenyl)-1,3-dihydro-indol-2-one as a pale yellow solid. (Yield 0.11 g, 91%)

Provenance & Evidence