反应详情

General Procedure B for α-Selenenylation of Aldehyde (Table 9, Entries 11 and 12): To a vial containing an aldehyde (0.25 mmol), and 0.5 mL of anhydrous CH2Cl2 was added catalyst L-prolinamide I (0.005 mmol) at room temperature. The mixture was vigorously stirred for 0.5 h in the presence of 4 Å molecule sieves (40 mg). Then N-(phenylseleno)phthalimide (0.3 mmol) was added. After 0.5 h, the molecule sieves were removed by filtrating paper and then the filtrate was treated with water (5 mL), the solution was extracted with ethyl acetate (3×5 mL). The combined extracts were dried over MgSO4, filtered, and concentrated iii vacuo. The resulting residue was then purified by silica gel chromatography, eluting with EtOAc/Hexane (1/40) to provide a clear oil.

1. waitAfter 0.5 h
2. customthe molecule sieves were removed
3. filtrationby filtrating paper
4. additionthe filtrate was treated with water (5 mL)
5. extractionthe solution was extracted with ethyl acetate (3×5 mL)
6. dry with materialThe combined extracts were dried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated iii vacuo
9. customThe resulting residue was then purified by silica gel chromatography
10. washeluting with EtOAc/Hexane (1/40)
11. customto provide a clear oil