反应详情

温度

0 °C

D-Leucine (9.9 g, 75.2 mmol) was dissolved in 3.0 M of HBr in water (120 mL) and cooled to 0° C. A solution of NaNO2 (8.3 g, 120 mmol) in water (20 mL, 100 mmol) was added. The reaction was stirred at 0° C. for 2.5 hours and then extracted twice with EtOAc, washed twice with saturated aqueous NaCl, dried over MgSO4, filtered, and concentrated to afford 12.6 g of intermediate (5a) as a pale yellow oil. This was taken on to the next step without further purification. 1H-NMR (DMSO): 4.31 (1H, t), 1.75 (2H, m) 1.65 (1H, m) 0.82 (6H, dd).

1. extractionextracted twice with EtOAc
2. washwashed twice with saturated aqueous NaCl
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated