反应详情

Methyl (2S)-3-(4-aminophenyl)-2-[(tert-butoxycarbonyl)amino]propanoate (1.0 g, 3.22 mmol) and N-chlorosuccinimide (474 mg, 3.55 mmol) were dissolved in DMF (20 mL) and allowed to stir under an atmosphere of nitrogen for 24 h. The reaction was quenched with water and diluted with ethyl acetate (100 mL). The organic phase was separated, dried over sodium sulfate, filtered and concentrated in vacuo. The crude material was purified by silica gel column (5–20% ethyl acetate/hexanes) to afford the product as a clear oil (645 mg, 61%). 1H NMR (400 MHz, CD3OD): δ 7.05 (s, 1H), 6.90–6.87 (m, 1H), 6.76–6.74 (m, 1H), 4.27–4.23 (m, 1H), 3.68 (s, 3H), 2.97–2.92 (m, 1H), 2.78–2.72 (m, 1H), 1.39 (s, 9H); LCMS found for C10H14ClN2O2 (M+H)+: m/z=229.

1. customThe reaction was quenched with water
2. additiondiluted with ethyl acetate (100 mL)
3. customThe organic phase was separated
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe crude material was purified by silica gel column (5–20% ethyl acetate/hexanes)