Trichloroacetyl chloride → HCID 21914138, compound

Participants

Reaction Conditions

Reaction Steps

Triethylamine (0.41291 mole) was added to intermediate (8) (0.08258 mole) suspended in dichloromethane (500 ml) at 0° C. Trichloroacetyl chloride (0.20645 mole) was added over 10 minutes. When the reaction appeared sluggish, an additional portion of triethylamine (20 ml) and then more trichloroacetyl chloride (7.6 ml) were added, and the mixture was stirred for 2 hours at low temperature. The ice bath was removed, and the mixture was allowed to sit for 2 hours. This resulted in a darker colored reaction, which was re-cooled to 0° C. Ice cold water (150 ml) was slowly added, and the mixture was stirred for 5 minutes. The layers were separated, and the organic phase was washed (ice cold 3N HCl, saturated NaHCO3), dried, filtered, and concentrated. The residue was triturated in ice cold diethylether (40 ml). Filtration, rinsing with ice cold diethylether (10 ml), yielding 15.13 g of 1-acetyl-5-chloro-2,3-dihydro-1H-indole-2-carbonitrile (intermediate 9, mp. 140-142° C.).

Provenance & Evidence