反应详情

To a stirred solution of 3,5-diamino-indazole-1-carboxylic acid tert-butylester (2.17 g, 8.75 mmol), PyBroP (4.1 g, 8.75 mmol) and 4-tert-butoxycarbonylamino-2-(3,4-dichloro-phenyl)-butyric acid (3 g, 8.75 mmol) in dichloromethane (100 mL) was added diisopropylethylamine (3.0 mL, 17.5 mmol) at 0° C. The resulting mixture was allowed to warm to room temperature over 4 hours then was concentrated and the residue partitioned between EtOAc and ammonium chloride (saturated, aqueous). The organic phase was separated and washed with sodium bicarbonate (saturated, aqueous), then dried (sodium sulfate) and concentrated to a brown foam. Purification by column chromatography (silica, 20% petroleum ether-EtOAc gave the title compound as a light brown solid (2.92 g, 58%); 1H NMR (400 MHz, DMSO) 1.36 (9H, s), 1.56 (9H, s), 1.80–1.90 (1H, m), 2.10–2.20 (1H, m), 2.89 (2H, m), 6.29 (2H, brs), 6.87 (1H, t), 7.38 (1H, d), 7.45 (1H, d), 7.61–7.65 (2H, m), 7.90 (1H, m), 8.19 (1H, s), 10.30 (1H, s); MS (ES+) m/e=578.

1. concentrationthen was concentrated
2. customthe residue partitioned between EtOAc and ammonium chloride (saturated, aqueous)
3. customThe organic phase was separated
4. washwashed with sodium bicarbonate (saturated, aqueous)
5. dry with materialdried (sodium sulfate)
6. concentrationconcentrated to a brown foam
7. customPurification by column chromatography (silica, 20% petroleum ether-EtOAc