反应详情

A round-bottomed flask was charged with Boc-D-alanine (600 mg, 3.17 mmol) and DL-serine methyl ester hydrochloride (691 mg, 4.44 mmol). DMF (12 ml) was added followed by N,N-diisopropylethylamine (1.5 ml, 8.6 mmol) and HATU (1.33 g, 3.49 mmol). The yellow reaction mixture was stirred at room temperature for 48 h then quenched with water and extracted with diethyl ether (2×). The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate, filtered and concentrated to afford 422 mg (41%) of 2-((R)-2-tert-butoxycarbonylamino-propionylamino)-3-hydroxy-propionic acid methyl ester as a colorless oil.

1. customthen quenched with water
2. extractionextracted with diethyl ether (2×)
3. washThe combined organic layers were washed twice with water and once with brine
4. dry with materialthen dried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated