反应详情

4′-Chloro-biphenyl-3-ylamine hydrochloride (1 g, 4.16 mmol), Pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester (1.08 g, 5.00 mmol) and HATU (2.06 g, 5.41 mmol) were suspended in DMF (20 mL) and DIPEA (2.20 mL, 12.5 mmol) was added. The mixture was stirred for 16 hours before being diluted with ethyl acetate (250 mL) and washed with water and brine. The organic layer was dried over magnesium sulfate and concentrated. The crude residue was purified by silica column chromatography (25% to 45% EtOAc/hexanes) to provide 2-(4′-Chloro-biphenyl-3-ylcarbamoyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (1.66 g, 99%). {1-[2-(4′-Chloro-biphenyl-3-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester: 2-(4′-Chloro-biphenyl-3-ylcarbamoyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (1.66 g, 4.14 mmol) was dissolved in methanol (20 mL) and concentrated HCl (4 mL) was added. The mixture was stirred at 50° C. for 80 min then cooled and concentrated. The residue was treated with 2-methoxycarbonylamino-3-methyl-butyric acid (870 mg, 4.97 mmol) and HATU (2.05 g, 5.38 mmol) and brought up in DMF (20 mL). The mixture was cooled to 0° C. and DIPEA (3.60 mL, 20.7 mmol). After 100 min, the reaction mixture was diluted with ethyl acetate (250 mL) and washed with water and brine. The organic phase was dried over magnesium sulfate and concentrated. The resulting residue was purified by silica column chromatography (50% to 80% EtOAc/hexanes) to afford {1-[2-(4′-Chloro-biphenyl-3-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester (1.83 g, 96% over 2 steps). (2-Methyl-1-{2-[4′-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-biphenyl-3-ylcarbamoyl]-pyrrolidine-1-carbonyl}-propyl)-carbamic acid methyl ester: {1-[2-(4′-Chloro-biphenyl-3-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester (409 mg, 0.893 mmol), bis(pinacolato)diboron (249 mg, 0.982 mmol), Pd2(dba)3 (20 mg, 0.0223 mmol), tris(cyclohexyl)phosphine (30 mg, 0.107 mmol) and potassium acetate (131 mg, 1.34 mmol) were suspended in dioxane (5 mL) and degassed with nitrogen for 4 min. The stirred suspension was heated to 80° C. for 14 hours before being cooled to RT, diluted with ethyl acetate (250 mL) and washed with water and brine. The organic phase was dried over magnesium sulfate and concentrated. The residue was purified by silica column chromatography (55% to 85% EtOAc/hexanes) to afford (2-Methyl-1-{2-[4′-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-biphenyl-3-ylcarbamoyl]-pyrrolidine-1-carbonyl}-propyl)-carbamic acid methyl ester (491 mg, 100%). {1-[2-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-[1,1′;4′,1″]terphenyl-3″-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester: (2-Methyl-1-{2-[4′-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-biphenyl-3-ylcarbamoyl]-pyrrolidine-1-carbonyl}-propyl)-carbamic acid methyl ester (135 mg, 0.246 mmol), (1-{2-[5-(4-Bromo-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (110 mg, 0.246 mmol), Pd(PPh3)4 (14 mg, 0.0123 mmol) and a 2 M aqueous solution of potassium carbonate (0.246 mL, 0.492 mmol) were degassed in 1,2-dimethoxyethane (2.5 mL) for 13 min. The stirred suspension was heated to 85° C. for 3 hours then concentrated, brought up in DMF/water and purified by reverse phase preparative HPLC to provide {1-[2-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-[1,1′;4′,1″]terphenyl-3″-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester (10 mg, 5%). (MeOH-d4, 400 MHz) 7.90 (s, 1H), 7.82-7.66 (m, 8H), 7.54-7.51 (m, 1H), 7.40-7.37 (m, 2H), 4.59 (m, 1H), 4.24 (m, 1H), 4.02-3.73 (m, 4H), 3.66 (s, 3H), 3.65 (s, 3H), 2.36-2.02 (m, 10H), 1.15-0.88 (m, 12H); MS (ESI) m/z 792 [M+H]+.

1. washwashed with water and brine
2. dry with materialThe organic layer was dried over magnesium sulfate
3. concentrationconcentrated
4. customThe crude residue was purified by silica column chromatography (25% to 45% EtOAc/hexanes)