反应详情

To a tetrahydrofuran (300 mL) solution of (6-benzyloxy-benzofuran-2-yl)-methanol (14.2 g, 55.8 mmol) described in Production Example 1-2-2 were added phthalimide (9.03 g, 61.4 mmol), triphenylphosphine (17.6 g, 67 mmol) and diethylazodicarboxylate (29.2 g, 67 mmol) at 0° C., which was stirred at room temperature for 7 hours 30 minutes. To the reaction mixture was added water at room temperature followed by extraction with ethyl acetate. After washing the organic layer with water and sat. NaCl, the organic layer was dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated under a reduced pressure and the residue was purified by NH silica gel column chromatography (heptane:ethyl acetate=3:1) to obtain a mixture of the title compound and a by-product (14.3 g) as a white solid. This was then used in the next reaction without additional purification.

1. extractionfollowed by extraction with ethyl acetate
2. washAfter washing the organic layer with water and sat. NaCl
3. dry with materialthe organic layer was dried over anhydrous magnesium sulfate
4. filtrationfiltered
5. concentrationThe filtrate was concentrated under a reduced pressure
6. customthe residue was purified by NH silica gel column chromatography (heptane:ethyl acetate=3:1)
7. customto obtain