Hydrochloric Acid → 2-[(1R,2S)-1-acetoxy-2-{(S)-2-cyclohexylmethoxycarbonylamino-4-methylvalerylamino}-3-methylbutyl]-3-phenylcyclopropenone

Participants

Reaction Steps

To 5 ml of a methylene chloride solution of 149 mg of 2-[(1R,2S)-2-{(S)-2-cyclohexylmethoxycarbonylamino-4-methylvalerylamino}-1-hydroxy-3-methylbutyl]-3-phenyl-cyclopropenone obtained in Example 2 were added 81 mg of acetyl chloride and 102 mg of triethylamine. The resultant mixture was stirred at room temperature for 3 hours, mixed with diluted hydrochloric acid and shaken with methylene chloride. The organic layer was washed with water, saturated aqueous sodium bicarbonate and saturated brine in that order, dried over magnesium sulfate and filtered. The filtrate was concentrated and chromatographed on a column of silica gel, eluting with hexane:ethyl acetate (1:1) to give 73 mg of the titled product.

Provenance & Evidence