反应详情

A 50-mL round-bottomed flask equipped with a magnetic stirrer was charged with 253c (321 mg, 1.0 mmol), 3-oxetanone (142 mg, 2.0 mmol), NaBH3CN (125 mg, 2.0 mmol), ZnCl2 (272 mg, 2.0 mmol), and methanol (10 mL). The mixture was stirred at room temperature overnight and concentrated under reduced pressure. Water (20 mL) was added to the residue and the resulting mixture was extracted with dichloromethane (3×20 mL). The combined organic layer was concentrated under reduced pressure and the residue was purified by silica-gel column chromatography eluting with ethyl acetate to afford 253d (210 mg, 56%) as yellow solid. MS-ESI: [M+H]+ 377.3.

1. customA 50-mL round-bottomed flask equipped with a magnetic stirrer
2. concentrationconcentrated under reduced pressure
3. additionWater (20 mL) was added to the residue
4. extractionthe resulting mixture was extracted with dichloromethane (3×20 mL)
5. concentrationThe combined organic layer was concentrated under reduced pressure
6. customthe residue was purified by silica-gel column chromatography
7. washeluting with ethyl acetate