Hydrochloric Acid → HCID 23449031, compound

Participants

Reaction Steps

A solution (17 ml) of 10% hydrochloric acid in methanol and 800 mg of 10%Pd—C. were added to a solution of 1.78 g of 7-azidoacetylimidazo[5,1-b]thiazole in 85 ml of methanol and 85 ml of THF. The atmosphere in the reactor was replaced with hydrogen. The system was stirred at room temperature for 5 hr. The catalyst was removed by filtration through Celite and washed with methanol. The solvent was removed by distillation. The residue was dissolved in 50 ml of DMF. Pyridine (3.43 ml) and 1.22 ml of acetic anhydride were added to the solution under ice cooling. The mixture was stirred at the same temperature for 2 hr. Dichloromethane and brine were added to the reaction solution. The mixture was adjusted to pH 10 by the addition of potassium carbonate. The organic layer were separated. The aqueous layer was further extracted five times with dichloromethane. The organic layers were combined together, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under the reduced pressure. The residue was purified by column chromatography on silica gel (dichloromethane:methanol=40:1 to 20:1) to give 397 mg of 7-acetylaminoacetylimidazo[5,1-b]thiazole.

Provenance & Evidence