反应详情

The product of step 3 (57.2 mg, 0.068 mmol) was dissolved in 1:1 methanol-triethylamine (2.8 mL). To this solution was added water (4.25 mL). The reaction progress was monitored by TLC (5% acetic acid and 15% methanol in dichloromethane) and was complete after 19 hours. The methanol and triethylamine were evaporated in vacuo, the residue was acidified with 1 N aqueous hydrochloric acid (1.4 mL), extracted with ethyl acetate (20 mL), washed with brine (5 mL), dried over sodium sulfate, filtered, concentrated and purified by chromatography (10 g silica gel, 5% acetic acid and 15% methanol in dichloromethane) to afford 4′-{(2S,3R)-1-(4-fluorophenyl)-3-[(3S)-3-(4-fluorophenyl)-3-hydroxypropyl]-4-oxoazetidin-2-yl}biphenyl-3-yl β-L-glucopyranosiduronic acid (32.6 mg, 73%) as an off-white foam; Rf 0.37 (5% acetic acid and 15% methanol in dichloromethane); 1H NMR (300 MHz, CD3OD) δ 7.63 (d, J=7.8 Hz, 2H), 7.43 (d, J=8.1 Hz, 2H), 7.33 (m, 7H), 7.06 (m, 5H), 5.03 (m, 1H), 4.63 (t, J=5.1, 5.1 Hz, 2H), 3.94 (m, 3H), 3.13 (m, 1H) 1.91 (m, 4H) ppm; MS [M−H] 660.6.

1. customThe methanol and triethylamine were evaporated in vacuo
2. extractionextracted with ethyl acetate (20 mL)
3. washwashed with brine (5 mL)
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. custompurified by chromatography (10 g silica gel, 5% acetic acid and 15% methanol in dichloromethane)