反应详情

To a solution of L-Serine methyl ester hydrochloride (5.0 g, 32.0 mmol), in CH2Cl2 (150 mL) at 0° C., were added Et3N (4.88 mL, 35.2 mmol), Boc-D-Alanine (6.06 g, 32 mmol), and DCC (7.26 g, 35.2 mmol) sequentially. The reaction was allowed to warm to room temperature and stirred overnight. All the solvent was evaporated and the residue was triturated with ethyl acetate and the precipitate was filtered off. The filtrate was concentrated under low pressure and chromatographed on silica gel (70% ethyl acetate/30% chloroform) to yield 86% of methyl 2-((R)-2-(tert-butoxycarbonylamino)propanamido)-3-hydroxypropanoate.

1. customAll the solvent was evaporated
2. customthe residue was triturated with ethyl acetate
3. filtrationthe precipitate was filtered off
4. concentrationThe filtrate was concentrated under low pressure
5. customchromatographed on silica gel (70% ethyl acetate/30% chloroform)