反应详情

A solution of phenylmethyl (2S)-2-methyl-1-piperazinecarboxylate (commercially available) (1 g, 4.3 mmol) and benzyloxyacetaldehyde (0.9 mL, 6.4 mmol) in DCM (50 mL) was stirred for 30 minutes, and then NaBH(OAc)3 (1.36 g, 6.4 mmol) was added. The reaction was stirred overnight before being quenched with 1 M NaOH. The phases were separated and the aqueous layer was extracted with DCM. The combined organics were washed with brine, dried over sodium sulfate and concentrated to a crude residue, which was purified by silica gel chromatography (5-95% EtOAc in hexane) yielding phenylmethyl (2S)-2-methyl-4-{2-[(phenylmethyl)oxy]ethyl}-1-piperazinecarboxylate (0.93 g, 58%). LCMS: (M+H)+: 369.1

1. custombefore being quenched with 1 M NaOH
2. customThe phases were separated
3. extractionthe aqueous layer was extracted with DCM
4. washThe combined organics were washed with brine
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated to a crude residue, which
7. customwas purified by silica gel chromatography (5-95% EtOAc in hexane)