Trichloroacetyl chloride → HCID 21190110, compound

Participants

Reaction Steps

To a solution of 3.15 g (7.22 mmol) of 5-[N-tert-butoxycarbonyl-N-[3-(trifluoromethanesulfonamido)propan-1-yl]aminomethyl]imidazo[1,2-a]pyridine and 2.65 g (21.65 mmol) of 4-dimethylaminopyridine in 30 ml of chloroform was added dropwise, while stirring at room temperature for 3 minutes, 2.4 ml (21.65 mmol) of trichloroacetyl chloride. The reaction mixture was heated for 15 hours under reflux. After completion of the reaction, the reaction mixture was poured into ice-water, which was neutralized with a saturated aqueous solution of sodium hydrogencarbonate. The solution was extracted with 150 ml of chloroform. The organic layer was washed with 250 ml of a saturated aqueous saline solution and dried over magnesium sulfate. The solvent was then distilled off under reduced pressure. The residue was purified by silicagel column chromatography (eluent: chloroform/methanol=100:1) to give 2.31 g of the desired compound (54.8%, pale yellow liquid).

Provenance & Evidence