Sodium Hydroxide → N-[[-(methoxycarbonyl)phenyl]sulfonyl]-3-(p-nitrophenyl)-D-alanine

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2.3 g of p-nitro-D-phenylalanine are suspended in 25 ml of dioxan and treated with 10 ml of 1N sodium hydroxide solution and 1.7 g of sodium bicarbonate. A solution of 2.6 g of methyl 2-chiorosulfonylbenzoate in 22 ml of dioxanl is added dropwise thereto and the mixture is stirred at room temperature for 9 hours. The reaction mixture is poured into ice-cold 2N hydrochloric acid and extracted with ethyl acetate. The organic phase is washed with water, dried and evaporated. There are 35 obtained 3.2 g of N-[[o-(methoxycarbonyl)phenyl]sulfonyl]-3-(p-nitrophenyl)-D-alanine.

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