Water → Fmoc-(RS)-3-amino-3-(4-nitrophenyl)-propionic acid

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A cold (0°) solution of 3-amino-3-(4-nitrophenyl)propanoic acid (3.2 g, 15 mmol) in 10% aqueous sodium carbonate (60 ml) and 1,4-dioxan (30 ml) was treated portion-wise with 9-fluorenylmethoxycarbonyl-N-hydroxysuccinimide (5.6 g, 17 mmol) in 1,4-dioxan (15 ml) and the mixture stirred at room temperature for 12 h. The mixture was poured into water (300 ml) and the aqueous phase washed 3 times with ether. The aqueous layer was then acidified with solid citric acid and extracted into ether. The combined organic layers were dried (MgSO4) and evaporated to a yellow oil then triturated from hexane and EtOAc to afford the title compound as a yellow solid (2.83 g); m/z (ES+, 70V) 432 (MH+).

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