反应详情

To a solution of compound 3 (2.6 g, 12.3 mmol) in DMF was added HOBt.H2O (2.26 g, 14.76 mmol), EDC.HCl (2.80 g, 14.76 mmol), HCl.H-Phe-NH2 (3.16 g, 14.76 mmol), triethylamine (1.72 mL, 12.3 mmol) sequentially at 0° C. and the mixture was stirred for 14 h at room temperature. After the solvent was removed in vacuo, the residue was dissolved in AcOEt and washed with 5% citric acid, 5% NaHCO3 and saturated NaCl for three times, respectively. Then, the organic layer was dried over Na2SO4 and evaporated in vacuo. The resultant crude product was purified by silica-gel column chromatography (CHCl3:MeOH=100:1 to 10:1) to obtain the desired compound 4; yield 1.9 g (43.4%); m.p. 49-53° C.; 1H NMR (300 MHz, CDCl3) δ 11.04 (s, 1H), 7.82 (s, 1H), 7.34-7.22 (m, 5H), 6.24 (s, 1H), 5.96 (br s, 1H), 5.45 (br s, 1H), 4.78-4.71 (m, 1H), 3.24-3.11 (m, 2H), 1.38 (s, 9H); HRMS (EI): m/z 357.1689 (M+) (calced for C19H23N3O4: 357.1688).

1. customAfter the solvent was removed in vacuo
2. dissolutionthe residue was dissolved in AcOEt
3. washwashed with 5% citric acid, 5% NaHCO3 and saturated NaCl for three times
4. dry with materialThen, the organic layer was dried over Na2SO4
5. customevaporated in vacuo
6. customThe resultant crude product was purified by silica-gel column chromatography (CHCl3:MeOH=100:1 to 10:1)