反应详情

To a stirred solution of benzyl 4-aminocyclohexanecarboxylate (900 mg, 3.9 mmol), boc-proline (830 mg, 3.9 mmol), HOBt (521 mg, 3.9 mmol), and triethylamine (1.6 ml, 11.6 mmol) in CH2Cl2 (30.0 ml) was added EDC.HCl (1.1 g, 5.8 mmol) at 0° C. The reaction mixture was stirred at room temperature for 16 hr, and concentrated in vacuo. Water was added to the residue, and extracted with EtOAc. The extract was washed with sat. NaHCO3, 2-M citric acid, and sat. NaHCO3, then dried over Na2SO4, and concentrated in vacuo. The residue was purified by column chromatography on silica gel with n-hexane-EtOAc (6:1, v/v) as eluent to give benzylcis-4-[(1-tert-butoxycarbonyl-2-pyrrolidinyl)carbonylamino]cyclohexanecarboxylate (600 mg, 36%) as an amorphous solid. 1H-NMR (CDCl3) δ 1.44 (s, 9H), 1.50–1.90 (m, 12H), 2.20–2.26 (m, 1H), 3.25–3.50 (m, 2H), 3.80–3.90 (m, 1H), 4.10–4.25 (m, 1H), 5.12 (s, 2H), 7.35–7.36 (m, 5H).

1. concentrationconcentrated in vacuo
2. additionWater was added to the residue
3. extractionextracted with EtOAc
4. washThe extract was washed with sat. NaHCO3, 2-M citric acid, and sat. NaHCO3
5. dry with materialdried over Na2SO4
6. concentrationconcentrated in vacuo
7. customThe residue was purified by column chromatography on silica gel with n-hexane-EtOAc (6:1