反应详情

温度

0 °C

To a solution of 2-benzylamino-propionic acid ethyl ester (1 eq.) in dry DCM was added MgSO4 (0.75 eq.). The reaction was cooled to 0° C. then the above solution of chloroacetaldehyde in dry DCM (solution I) and acetic acid (1 eq.) were added. Sodium triacetoxyborohydride (1.5 eq.) was added portionwise. The reaction was stirred for 1 h at 0° C. The crude was carefully quenched with a saturated aqueous solution of NaHCO3. Then aqueous NaOH (2N) was added. The aqueous layer was extracted with DCM. The combined organic layers were washed with an aqueous saturated solution of NaHCO3, then dried over MgSO4 and concentrated under reduced pressure. The crude was purified by chromatography on silica gel (elution with heptane/EtOAc 98/2 to 95/5) to afford 2-[benzyl-(2-chloro-ethyl)-amino]-propionic acid ethyl ester.

1. customThe crude was carefully quenched with a saturated aqueous solution of NaHCO3
2. additionThen aqueous NaOH (2N) was added
3. extractionThe aqueous layer was extracted with DCM
4. washThe combined organic layers were washed with an aqueous saturated solution of NaHCO3
5. dry with materialdried over MgSO4
6. concentrationconcentrated under reduced pressure
7. customThe crude was purified by chromatography on silica gel (elution with heptane/EtOAc 98/2 to 95/5)