反应详情

One molar potassium dihydrogen phosphate (KH2PO4) solution (4.0 mL; 4.0 mmol) followed by zinc powder (2.0 g; 30 mmol) was added to a stirred solution of the product from 12b (1.50 g; 2.8 mmol) in tetrahydrofuran (25 mL). After stirring 18 h at ambient temperature, a new portion of 1 M KH2PO4 solution (5 mL) and zinc (2.0 g; 30 mmol) was added. Additional 1 M KH2PO4 solution (25 mL) was added after 5 h and the mixture was stirred overnight at ambient temperature. The mixture was vacuum filtered and the residue was washed with ethyl acetate. Ethyl acetate in the filtrate was evaporated off and the aqueous solution was extracted with dichloromethane (4×5 mL). The combined extracts were dried (Na2SO4), filtered, and evaporated. 1.04 g (93%) product was obtained (pale yellow waxy solid).

1. stirringthe mixture was stirred overnight at ambient temperature
2. filtrationfiltered
3. washthe residue was washed with ethyl acetate
4. customEthyl acetate in the filtrate was evaporated off
5. extractionthe aqueous solution was extracted with dichloromethane (4×5 mL)
6. dry with materialThe combined extracts were dried (Na2SO4)
7. filtrationfiltered
8. customevaporated