反应详情

A solution of 2,3,4,5,6-pentafluorobenzoic acid benzyl ester (Example 1d, 8.05 g, 26.6 mmol), triethylamine (26 mL, 186 mmol), and (S)-pyrrolidin-3-yl-carbamic acid tert-butyl ester (5.6 g, 30 mmol) in acetonitrile (150 mL) is stirred at room temperature for 24 hours. The solvent is removed under vacuum and the residue dissolved in chloroform, washed with NaHCO3 and then brine, dried over Na2SO4, filtered, and concentrated in vacuo to afford a solid. The solid is then purified by column chromatography (1:1:6 ethyl acetate/chloroform/hexanes) to yield the title compound as a solid (7.92 g). 1H NMR (CDCl3): δ 7.48-7.30 (m, 5H, 5.35 (s, 2H), 4.77-4.50 (m, 1H), 4.37-4.19 (m, 1H), 4.01-3.63 (m, 3H), 3.59-3.46 (m, 1H), 2.29-2.09 (m, 1H), 2.01-1.82 (m, 1H), 1.45 (s, 9H).

1. customThe solvent is removed under vacuum
2. dissolutionthe residue dissolved in chloroform
3. washwashed with NaHCO3
4. dry with materialbrine, dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customto afford a solid
8. customThe solid is then purified by column chromatography (1:1:6 ethyl acetate/chloroform/hexanes)