反应详情

To the mixture of Example 45B (1.25 g, 5.6 mmol) in CH2Cl2 (50 mL) cooled with an ice-bath was added triethylamine (2.3 mL, 16.8 mmol), and 5-chloro-2-methoxybenzoyl chloride (the product from Step A of Example 11C) (1.15 g, 5.6 mmol) dropwise. The mixture was stirred at ambient temperature for 2 h, then treated with water (50 mL) and CH2Cl2 (50 mL). The organic layer was washed with brine and concentrated. Purification by flash chromatography (silica gel, Et3N/MeOH/EtOAc, (1:10:90) in hexane in 10-40% gradient) afforded 1.75 g (80%) of the title compound. 1H NMR (300 MHz, DMSO-d6) δ ppm 1.24 (s, 9H), 1.46-1.59 (m, 1H), 1.61-1.82 (m, 2H), 1.84-1.97 (m, 1H), 3.54-3.76 (m, 2H), 3.97 (s, 3H), 4.01-4.23 (m, 3H), 6.31 (s, 1H), 7.28 (d, J=8.72 Hz, 1H), 7.62 (dd, J=8.73, 2.78 Hz, 1H), 7.81 (d, J=2.78 Hz, 1H), 10.25 (s, 1H)); MS (ESI) m/z 392 [M+H]+, 390 [M−H].

1. washThe organic layer was washed with brine
2. concentrationconcentrated
3. customPurification by flash chromatography (silica gel, Et3N/MeOH/EtOAc, (1:10:90) in hexane in 10-40% gradient)