Ethyl chloroformate → HCID 18932354, compound

Participants

Reaction Steps

28 mg of sodium hydride (as a 60% w/w dispersion in mineral oil) were added to a solution of 187 mg of N-[4-(benzothiazol-2-ylmethoxy)phenyl]acetamide (prepared as described in Example 1 above) in 4 ml of dimethylformamide cooled in an ice-water bath. The resulting mixture was stirred for 5 minutes at the same temperature, after which 0.066 ml of ethyl chloroformate were added, the temperature of the resulting mixture was elevated to room temperature and the mixture was stirred for 5 hours. At the end of this time, the reaction mixture was added to a saturated aqueous ammonium chloride solution and the resulting mixture was extracted with ethyl acetate. The resulting extract was washed consecutively with water and a saturated aqueous sodium chloride solution and then dried over anhydrous sodium sulfate. The solvent was then removed by evaporation under reduced pressure to give a crude crystalline solid which was purified by column chromatography through silica gel using a 1:1 by volume mixture of hexane and ethyl acetate as the eluent, to give 25.6 mg (yield 81%) of the title compound as a solid having a melting point of 155° to 160° C.

Provenance & Evidence