反应详情

A solution of (1-benzyl-4-hydroxymethyl-pyrrolidin-3-yl)-methanol (7.89 g, 31.2 mmol) and p-toluenesulfonic acid monohydrate (7.12 g, 37.4 mmol) in toluene (150 mL) was heated under a Dean Stark trap (120° C., 20 h). The reaction mixture was cooled (rt) and treated with 1 N NaOH (50 mL). The aqueous phase was extracted with methyl tert-butyl ether (3×50 mL). The combined organic layers were dried, filtered and concentrated in vacuo. The resulting residue was purified by silica gel column chromatography using MeOH (0.2 M NH3):DCM (0-5%) to afford the title compound as a yellow oil (5.08 g, 80%). 1H NMR (500 MHz, CDCl3): 7.37-7.29 (m, 4H), 7.29-7.24 (m, 1H), 3.87-3.79 (m, 2H), 3.65-3.56 (m, 4H), 2.86-2.75 (m, 2H), 2.75-2.66 (m, 2H), 2.34 (dt, J=12.2, 6.1, 2H).

1. extractionThe aqueous phase was extracted with methyl tert-butyl ether (3×50 mL)
2. customThe combined organic layers were dried
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customThe resulting residue was purified by silica gel column chromatography