反应详情

温度

0 °C

A solution (70 ml) obtained in Step A of Example 45 of Compound 45a (2.5 g) in methylene chloride was cooled to 0° C. and then trimethylsilylcyanide (5.4 ml) and boron trifluoride ether complex (2.5 ml) were successively added thereto, followed by stirring at 0° C. for 2 hours. The reaction solution was poured into a saturated aqueous solution of sodium bicarbonate and the mixture was extracted with chloroform. The organic layer was washed with a saturated saline and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (chloroform/methanol=30/1) to give Compound 63 (0.61 g, 23.8%) as pale-yellow crystals.

1. extractionthe mixture was extracted with chloroform
2. washThe organic layer was washed with a saturated saline
3. dry with materialdried over anhydrous magnesium sulfate
4. distillationthe solvent was distilled off under reduced pressure
5. customThe residue was purified by silica gel column chromatography (chloroform/methanol=30/1)