反应详情

A solution of 245-(4-bromo-phenyl)-1H-imidazol-2-yl]-4,4-difluoro-pyrrolidine-1-carboxylic acid tert-butyl ester (700 mg, 1.56 mmol), TMS-acetylene (1.11 mL, 7.79 mmol) and triethylamine (1.1 mL, 7.8 mmol) in DMF (8 mL) was degassed with N2 gas for 20 minutes. To the degassed solution was added Pd(PPh3)4 (180 mg, 0.16 mmol) and CuI (14.8 mg, 0.078 mmol). The pressure flask was sealed then heated at 80° C. overnight. After cooling to room temperature, the reaction was concentrated then diluted with EtOAc and washed with water. The aqueous phase was back-extracted two times then the organic phases were combined and dried over Na2SO4. After concentration, the crude material was purified by silica gel chromatography (10-50% EtOAc-hexanes gradient) to afford 4,4-difluoro-2-[5-(4-trimethylsilanylethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (547 g, 1.23 mmol, 79% yield). LCMS-ESI+: calc'd for C23H30F2N3O2Si: 446.2 (M+H+). Found: 445.8 (M+H+). (1-{4,4-Difluoro-2-[5-(4-trimethylsilanylethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester: To 4,4-difluoro-2-[5-(4-trimethylsilanylethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (547 mg, 1.23 mmol) in dioxanes (6 mL) was added 4N HCl in dioxanes (1.65 mL, 6.6 mmol). The suspension was stirred overnight then concentrated to afford the HCl salt of the crude amine. To the amine in DMF (5 mL) was added N-methylmorpholine (406 μl, 3.69 mmol). After all the material dissolved, 2-methoxycarbonylamino-3-methyl-butyric acid (236 mg, 1.35 mmol) and HATU (513 mg, 1.35 mmol) were added. After stirring for 2 hours the reaction was concentrated then diluted with EtOAc and washed with H2O. The aqueous phase was back-extracted two times then the organic layers were combined, dried over Na2SO4, and concentrated. The crude product was purified by silica gel chromatography (20-60% EtOAc-hexanes gradient) to afford (1-{4,4-difluoro-2-[5-(4-trimethylsilanylethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (412 mg, 0.82 mmol, 67% yield). LCMS-ESI+: calc'd for C25H33F2N4O3Si: 503.2 (M+H+). Found: 503.2 (M+H+). (1-{2-[5-(4-Ethynyl-phenyl)-1H-imidazol-2-yl]-4,4-difluoro-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester: To (1-{4,4-difluoro-2-[5-(4-trimethylsilanylethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (412 mg, 0.82 mmol) in MeOH (8 mL) was added K2CO3 (227 mg, 1.64 mmol). After stirring for 5 h, the reaction was filtered then concentrated. The residue was diluted with EtOAc then washed with H2O. The aqueous phase was back-extracted with EtOAc two times then the organic phases were combined, washed with brine, dried over Na2SO4, and concentrated. The crude material was purified by silica gel chromatography (20-80% EtOAc-hexanes gradient) to afford (1-{2-[5-(4-ethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (371 mg, 0.82 mmol, quantitative yield). LCMS-ESI+: calc'd for C22H25F2N4O3: 431.2 (M+H+). Found: 431.1 (M+H+). [1-(2-{5-[4-(4-{2-[4,4-Difluoro-1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carbonyl)-2-methyl-propyl]-carbamic acid methyl ester: A solution of (1-{2-[5-(4-bromo-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (400 mg, 0.89 mmol), (1-{2-[5-(4-ethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (371 mg, 0.89 mmol), and triethylamine (372 μl, 2.67 mmol) in DMF (8 mL) was degassed with N2 gas for 20 minutes. To the degassed solution was added Pd(PPh3)4 (103 mg, 0.089 mmol) and CuI (17 mg, 0.089 mmol). The pressure flask was sealed then heated at 80° C. overnight. After cooling to room temperature, the reaction was quenched with AcOH then purified by reverse phase preparative HPLC (10-70% MeCN—H2O; 0.1% formic acid modifier) then silica gel chromatography (0-10% MeOH-EtOAc gradient) to afford [1-(2-{5-[4-(4-{2-[4,4-difluoro-1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carbonyl)-2-methyl-propyl]-carbamic acid methyl ester (231 mg, 0.29 mmol, 33% yield). 1H-NMR: 400 MHz, (DMSO-d6) δ: 12.04 (s, 1H), 11.84 (s, 1H), 7.78-7.76 (m, 4H), 7.61 (s, 1H), 7.56 (s, 1H), 7.50-7.48 (m, 6H), 7.28 (d, 2H), 5.29 (t, 1H), 5.07 (m, 1H), 4.52 (m, 1H), 4.24-4.14 (m, 1H), 4.06 (t, 1H), 3.93 (t, 1H), 3.80 (m, 2H), 3.55 (s, 3H), 3.54 (s, 3H), 2.93 (m, 1H), 2.77 (m, 1H), 2.14-1.88 (m, 6H), 0.90-0.84 (m, 12H). LCMS-ESI+: calc'd for C42H49N8O6: 799.4 (M+H+). Found: 799.0 (M+H+).

1. filtrationthe reaction was filtered
2. concentrationthen concentrated
3. additionThe residue was diluted with EtOAc
4. washthen washed with H2O
5. extractionThe aqueous phase was back-extracted with EtOAc two times
6. washwashed with brine
7. dry with materialdried over Na2SO4
8. concentrationconcentrated
9. customThe crude material was purified by silica gel chromatography (20-80% EtOAc-hexanes gradient)