反应详情

To the solution of 2-Aza-bicyclo[2.2.1]heptane-2,3-dicarboxylic acid 2-tert-butyl ester (155 mg, 0.64 mmol) and triethylamine (77 μl, 0.55 mmol) in acetonitrile (3 ml) was added a solution of Pyrrolidine-1,2-dicarboxylic acid 2-{2-[7-(2-bromo-acetyl)-dibenzofuran-3-yl]-2-oxo-ethyl}ester 1-tert-butyl ester (200 mg, 0.37 mmol) in DMF (6 ml). The mixture was stirred for 10 hours, and the solvent was evaporated. The mixture was diluted with EtOAc, and washed with water and brine, and was dried with sodium sulfate. Concentration gave 2-Aza-bicyclo[2.2.1]heptane-2,3-dicarboxylic acid 3-(2-{7-[2-(1-tert-butoxycarbonyl-pyrrolidine-2-carbonyloxy)-acetyl]-dibenzofuran-3-yl}-2-oxo-ethyl)ester 2-tert-butyl ester (243 mg). m/z: 703.3 (M−1), 727.2 (M+Na) 3-(5-{7-[2-(1-tert-Butoxycarbonyl-pyrrolidin-2-yl)-3H-imidazol-4-yl]dibenzofuran-3-yl}-1H-imidazol-2-yl)-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester: The mixture of 2-Aza-bicyclo[2.2.1]heptane-2,3-dicarboxylic acid 3-(2-{7-[2-(1-tert-butoxycarbonyl-pyrrolidine-2-carbonyloxy)-acetyl]-dibenzofuran-3-yl}-2-oxo-ethyl)ester 2-tert-butyl ester (243 mg) and ammonium acetate (860 mg, 11 mmol) in xylene (5 ml) was heated at 140° C. for 80 minutes under microwave. The mixture was quenched with water, and extracted with EtOAc. The organic phase was washed with water and brine, and was dried with sodium sulfate. Concentration and purification by flash column chromatography (DCM/EtOAc) gave 3-(5-{7-[2-(1-tert-Butoxycarbonyl-pyrrolidin-2-yl)-3H-imidazol-4-yl]dibenzofuran-3-yl}-1H-imidazol-2-yl)-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (170 mg). m/z: 665.0 (M+1), 663.4 (M−1), 333.0 (M+2)/2. (1-{3-[5-(7-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-dibenzofuran-3-yl)-1H-imidazol-2-yl]-2-aza-bicyclo[2.2.1]heptane-2-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester: To the solution of 3-(5-{7-[2-(1-tert-Butoxycarbonyl-pyrrolidin-2-yl)-3H-imidazol-4-yl]dibenzofuran-3-yl}-1H-imidazol-2-yl)-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (170 mg) in DCM (6 ml) was added TFA (3 ml). The mixture was stirred for 60 minutes, and the solvent and reagent were removed under reduced pressure. The mixture was diluted with acetonitrile and water, and was freezer-dried to give brown powder. To the solution of above powder (0.256 mmol) and MeOCO-Val-OH (90 mg, 0.51 mmol) in DMF (7.5 ml) was added HATU (204 mg, 0.54 mmol), followed by diisopropylethylamine (0.45 ml, 2.56 mmol). The mixture was stirred for 90 minutes and was diluted with EtOAc. The organic phase was washed with 1 N NaOH solution, water, and brine, and was dried with sodium sulfate. Concentration and purification by HPLC (0.1% TFA/CH3CN/0.1% TFA/H2O) gave (1-{3-[5-(7-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-dibenzofuran-3-yl)-1H-imidazol-2-yl]-2-aza-bicyclo[2.2.1]heptane-2-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (127 mg). m/z: 779.3 (M+1), 777.3 (M−1), 390.2 (M+2)/2. 1H NMR (CD3OD, 300 MHz) δ 8.23 (2H, d, J=8.2 Hz), 8.03 (2H, s), 7.98 (2H, m), 7.88 (2H, d, J=8.2 Hz), 5.25 (1H, m), 4.85 (1H, m), 4.33 (1H, d, J=6.1 Hz), 4.24 (1H, d, J=7.0 Hz), 4.15 (1H, m), 3.88 (1H, m), 3.69 (3H, s), 3.67 (3H, s), 3.45 (1H, m), 2.89 (1H, m), 2.60 (1H, m), 2.35-1.6 (11H, m), 1.05-0.8 (12H, m).

1. customthe solvent was evaporated
2. additionThe mixture was diluted with EtOAc
3. washwashed with water and brine
4. dry with materialwas dried with sodium sulfate
5. concentrationConcentration