2,4-Dichloronitrobenzene → N-(t-butyloxycarbonyl)-4-(3-chloro-6-nitrophenoxy)-L-phenylalanine 4-pyridylamide dihydrochloride

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Reaction Steps

To a solution of N-(t-butyloxycarbonyl)-4-hydroxy-L-phenylalanine 4-pyridylamide (5.35 g) in dimethyl sulfoxide (100 ml) was added oily sodium hydride (0.62 g), followed by stirring at room temperature for 30 minutes. Thereafter, 2,4-dichloronitrobenzene (2.88 g) was added and stirred at room temperature for 10 hours. After a conventional post-treatment, N-(t-butyloxycarbonyl)-4-(3-chloro-6-nitrophenoxy)-L-phenylalanine 4-pyridylamide dihydrochloride (6.66 g) was obtained. The above compound (I) (6.50 g) was allowed to react with 4N-hydrogen chloride/dioxane solution (50 ml) to obtain 4-(3-chloro-6-nitrophenoxy-L-phenylalanine 4-pyridylamide dihydrochloride, which was further allowed to react with trans-4-(t-butyloxycarbonyl)aminomethylcyclohexylcarboxylic acid mixed acid anhydride obtained in Example 5 to obtain N-[trans-4-(t-butyloxycarbonyl)aminomethylcyclohexylcarbonyl]-4-(3-chloro-6-nitrophenoxy)-L-phenylalanine 4-pyridylamide (II) (7.16 g). The above compound (II) (7.00 g) was allowed to react with 4N-hydrogenn chloride/dioxane solution (150 ml) to obtain N-(trans-4-aminomethylcyclohexylcarbonyl)-4-(3-chloro-6-nitrophenoxy)-L-phenylalanine 4-pyridylamide (6.06 g).

Provenance & Evidence