反应详情

Pd/C (10%, 5.0 g) was added to a solution of methyl 2-(benzyloxycarbonylamino)-2-(oxetan-3-ylidene)acetate (10.0 g, 36 mmol) in MeOH (100 mL). The suspension was stirred under hydrogen atmosphere at ambient temperature for 12 h. The catalyst was filtered off and washed with MeOH (100 mL). The filtrate and washings were combined followed by addition of benzyloxycarbonyl N-succinimide (Cbz-OSu; 10.0 g, 40 mmol) and triethylamine (15.2 mL, 108 mmol). The reaction mixture was stirred for 12 h at ambient temperature and then concentrated. The residue was purified by flash column chromatography on silica gel (Hexane/EtOAc=5:1) to afford methyl 2-(benzyloxycarbonylamino)-2-(oxetan-3-yl)acetate (4.3 g, 41% yield) as a yellow solid.

1. filtrationThe catalyst was filtered off
2. washwashed with MeOH (100 mL)
3. stirringThe reaction mixture was stirred for 12 h at ambient temperature
4. concentrationconcentrated
5. customThe residue was purified by flash column chromatography on silica gel (Hexane/EtOAc=5:1)