Ammonium Chloride → 2-benzyloxy-N-[1-(3,5-dichlorophenylthio)-3-methyl-2-oxobutyl]-N-methylacetamide

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In 2 ml of dry tetrahydrofuran was dissolved 100 mg (0.4 mmol )of 2-benzyloxy-N-methyl-N-(3-methyl-2-oxobutyl)acetamide (18a'), and there was added 223 μl (0.4 mmol)of n-butyllithium (1.7 M hexane solution)with stirring at -78° C. over 10 minutes. After stirring at -78° C. for 1 hour, and a tetrahydrofuran solution (1 ml)of 135 mg (0.4 mmol)of 3,5-dichlorophenylsulfide was added thereto over 10 minutes. After 30 minutes, the temperature was raised up to room temperature, a saturated aqueous ammonium chloride solution was added, and the mixture was extracted with ethyl acetate ester. The extract was washed with saturated brine, dried over anhydrous sodium sulfate, filtered, and concentrated. The crude product was purified by silica gel chromatography (hexane/ethyl acetate 5:1)to give 79 mg of 2-benzyloxy-N-[1-(3,5-dichlorophenylthio)-3-methyl-2-oxobutyl]-N-methylacetamide (20)(yield 47%).

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