Trichloroacetyl chloride → HCID 21914140, compound

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Reaction Steps

To a suspension of intermediate (18) (0.0076 mole) in DCM (30 ml), cooled in an ice bath under argon, was added triethylamine (0.0228 mole) followed by trichloroacetyl chloride (0.0115 mole). The mixture was allowed to warm to room temperature and stir for 2 hours. The mixture was washed with water, 2N HCl, and saturated NaHCO3. The organic layer was dried and concentrated. The concentrate was triturated in ether and purified on silica gel column, eluting with 50% ethyl acetate in hexane. The desired fractions were combined and concentrated. The residue was triturated in ether and the solid collected by filtration and allowed to dry, yielding 0.30 g of 1-acetyl-5-fluoro-2,3-dihydro-1H-indole-2-carbonitrile (intermediate 19, mp. 93-95° C.).

Provenance & Evidence