Benzenesulfonyl chloride → 3-[(2S)-2-(benzenesulfonylamino)-3-[4-(1-benzyloxycarbonyl-4-piperidyloxy)phenyl]propoxy]-4-iodobenzonitrile

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Reaction Steps

1.6 g (2.7 mmol) of 3-[(2S)-3-[4-(1-benzyloxycarbonyl-4-piperidyloxy)phenyl]-2-(t-butoxycarbonylamino)propoxy]-4-iodobenzonitrile was dissolved in 4 N solution of hydrogen chloride in dioxane, and the solution was stirred at room temperature overnight. The solvent was distilled off, and the residue was dissolved in dimethylformamide. 1 ml (6 mmol) of N,N-diisobutylethylamine and 0.34 ml (2.7 mmol) of benzenesulfonyl chloride were added to the solution under cooling with ice, and they were stirred for 2 hours. After the isolation process with ethyl acetate as the extractant in the same manner as that of step 1 in Example 1, the crude product was obtained, which was purified by the silica gel column chromatography to obtain the title compound.

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