反应详情

A mixture of 3-{[(benzyloxy)carbonyl]amino}-N-(tert-butoxycarbonyl)alanine (100 g, 0.29 mol), potassium carbonate (82 g, 0.59 mol) and methyl iodide (42 g, 0.29 mol) in DMSO (1200 mL) was stirred at room temperature. After 12 hours, the reaction mixture was extracted with ethyl acetate, and the organics were separated and concentrated under reduced pressure. The residue was purified by chromatography on silica gel to give methyl 3-{[(benzyloxy)carbonyl]amino}-N-(tert-butoxycarbonyl)alaninate. MS ESI calc'd. for C17H25N2O6 [M+H]+ 353. found 353. 1H NMR (400 MHz, CDCl3) δ 7.36-7.33 (m, 5H), 5.09 (s, 2H), 4.34-4.30 (m, 1H), 3.74 (s, 2H), 3.59 (t, J=6.0 Hz, 2H), 2.62 (s, 3H), 1.44 (s, 9H).

1. extractionthe reaction mixture was extracted with ethyl acetate
2. customthe organics were separated
3. concentrationconcentrated under reduced pressure
4. customThe residue was purified by chromatography on silica gel