反应详情

The 4-benzyloxy-pyrrolidine-1,2-dicarboxylic acid 1-t-butyl ester (1.00 g, 3.11 mmol) was taken up in anhydrous THF under argon and cooled to 0EC. BH3, THF (1.0 M, 6.22 mmol, 6.22 mL) was added to the solution dropwise over 10 min. The reaction mixture was then allowed to stir at 0EC for 30 min then warmed to room temp and stirred for an additional 30 min. The reaction was slowly poured into a 1N HCl solution and the aqueous layer was extracted three times with ethyl acetate. The combined organic layers were washed with water and brine then dried over MgSO4. The solution was filtered and the solvent removed under reduced pressure. The product was isolated by flash chromatography. (1:1 hexane-ethyl acetate) Yield 814 mg. 1H NMR (CDCl3, 300 MHz) δ 1.48 (s, 9H), 1.63-1.76 (m, 1H), 2.10-2.26 (m, 1H), 3.33 (m, 1H), 3.50-3.60 (m, 1H), 3.63-3.75 (m, 2H), 4.05-4.19 (m, 2H), 4.49 (s, 2H), 7.23-7.39 (m, 5H).

1. temperaturecooled to 0EC
2. stirringstirred for an additional 30 min
3. extractionthe aqueous layer was extracted three times with ethyl acetate
4. washThe combined organic layers were washed with water and brine
5. dry with materialthen dried over MgSO4
6. filtrationThe solution was filtered
7. customthe solvent removed under reduced pressure
8. customThe product was isolated by flash chromatography