1-Hydroxybenzotriazole → HCID 67103523, compound

Participants

Reaction Steps

The compound (263.3 mg) obtained in Example 102-3 was dissolved in ethanol (6 ml). The reaction solution was added with WSCI hydrochloride (147.5 mg) and HOBt (104.9 mg) and the whole was stirred at room temperature for 4 hours. The reaction solution was concentrated under reduced pressure and added with a 1 mol/l sodium hydroxide aqueous solution, followed by extraction with chloroform. The organic layer was washed with a saturated saline solution and dried with anhydrous sodium sulfate. After the drying agent was filtrated out, the filtrate was concentrated under reduced pressure. The resultant residue was dissolved in 2-methyl-2-propanol (6 ml). The reaction solution was added with pyridinium p-toluenesulfonate (35.2 mg) and the whole was refluxed under heating for 2 days. After that, the solution was added with 1 mol/l hydrochloric acid (4 ml) and stirred at 90° C. for 30 minutes. After having been cooled to room temperature, the reaction solution was subjected to extraction with chloroform. The aqueous layer was added with a 1 mol/l sodium hydroxide aqueous solution to thereby adjust to pH 13, followed by extraction with chloroform. The organic layer was washed with a saturated saline solution and dried with anhydrous sodium sulfate. After the drying agent was filtrated out, the filtrate was concentrated under reduced pressure. The resultant residue was purified through silica gel column chromatography (hexane/ethyl acetate) thereby obtaining the subject compound (83.5 mg) as a colorless oily substance.

Provenance & Evidence