Water → HCID 21942932, compound

Participants

Reaction Steps

Potassium carbonate (299 mg, 2.16 mmol) and ethyl bromoacetate (0.13 ml, 1.13 mmol) were added to a solution of 3-acetyl-6-chloro-2-[2-(3-(N-isopropylamino)propoxy)-5-methoxyphenyl]benzothiazoline (compound described in Example 3) (474 mg, 1.08 mmol) in anhydrous dimethylformamide at room temperature. The mixture was stirred at room temperature for 1.5 hours, water (30 ml) was added to the reaction mixture, and the whole was extracted with diethyl ether (50 ml). The organic layer was washed with water twice and saturated brine successively and dehydrated with anhydrous magnesium sulfate. Diethyl ether was evaporated under reduced pressure, and the obtained oily matter was purified by silica gel column chromatography (mobile phase:hexane/ethyl acetate=1/1). Methanol (2 ml) was added to the obtained oily matter, and a 10% solution (5 ml) of hydrogen chloride in methanol was added thereto with stirring under ice-cooling. The mixture was stirred at the temperature for five minutes, and the solvent was evaporatd under reduced pressure to give 542 mg (90%) of the target compound.

Provenance & Evidence