Sodium Carbonate → HCID 57803085, compound

Participants

Reaction Conditions

Reaction Steps

Crude rac-6-chloro-3-(3-chloro-phenyl)-3-hydroxy-1,3-dihydro-indol-2-one (from Example 5a supra) was suspended in a mixture of triethylsilane (5 mL, 31.3 mmol) (Aldrich) and trifluoroacetic acid (12.5 mL) and heated in an 90° C. oil bath for 17 hours. After cooling to room temperature, mixture was diluted with ethyl acetate (100 mL) and treated with solid sodium carbonate (10.5 g). After stirring for 30 minutes, mixture was extracted with water (2×100 mL) and brine (100 mL). Aqueous layers were back washed with ethyl acetate (100 mL). Organic layers were combined, dried (MgSO4), filtered and concentrated. Residue was purified by flash chromatography (Biotage 40M, dichloromethane then 7.5% ethyl acetate in dichloromethane as solvent). Fractions containing product were combined, concentrated and recrystallized from dichloromethane-hexanes to give rac-6-chloro-3-(3-chloro-phenyl)-1,3-dihydro-indol-2-one as white needles. (Yield 2.03 g, 73.0% over two steps).

Provenance & Evidence