反应详情

To a stirred solution of the title compound from Step A (8.51 g, 20.0 mmol) in methanol/water=4:1 (50 mL) was added lithium hydroxide (2.39 g, 100 mmol). The resulting mixture was stirred at RT overnight. The mixture was diluted with water and extracted with ether. The aqueous layer was acidified with 1N citric acid to PH 4.5, and then extracted with ethyl acetate. The organic layer was separated and washed with water, brine, dried over Na2SO4, and concentrated. The residue was purified by SFC (using an AD column 35% MeOH/65% CO2, 150 ml/min 100 bar) to afford 6.90 g (84%) of the title compound (i-4) as a white solid. 1H NMR (400 MHz, CDCl3): δ 8.53 (s, 2H), 8.00 (d, J=7.7 Hz, 2H), 7.77 (d, J=6.4 Hz, 1H), 7.32-7.29 (m, 1H), 7.21 (d, J=8.0 Hz, 2H), 5.22 (s, 1H), 4.51 (d, J=8.4 Hz, 1H), 4.13-4.11 (m, 1H), 4.09-4.01 (m, 1H), 3.07-3.04 (m, 1H), 2.58-2.56 (m, 1H), 1.68-1.51 (m, 2H), 1.42 (s, 9H). MS: m/z (EST) 413 (M+1).

1. extractionextracted with ether
2. extractionextracted with ethyl acetate
3. customThe organic layer was separated
4. washwashed with water, brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. customThe residue was purified by SFC (