反应详情

To a solution of crude 5-hydroxyl-5-(2-methoxyphenyl)-1-pentene, prepared as described above, in toluene (150 mL) at 0° to 40° C. was added diphenylphosphoryl azide (25.86 mL, 120 mmol) followed by DBU (17.95 mL, 120 mmol) and the resulting reaction mixture was stirred at room temperature (20° C. to 25° C.) for 28 hours. H2O was added, the aqueous layer was extracted with ether (×4), and the combined organic layers were washed with H2O (×2), 0.5N HCl (×2) and brine (×2), dried over MgSO4 and evaporated in vacuo. The crude product was purified by silica gel flash chromatography (5% EtOAc-95% hexanes) to provide the title compound as a colorless liquid (14 g). 1H NMR (CDCl3, 400 MHz) δ: 6.8-7.4 (4H), 5.8 (1H), 5.0 (2H), 3.83 (3H, OMe), 1.8-2.2 (4H).

1. customat 0° to 40° C.
2. customthe resulting reaction mixture
3. extractionthe aqueous layer was extracted with ether (×4)
4. washthe combined organic layers were washed with H2O (×2), 0.5N HCl (×2) and brine (×2)
5. dry with materialdried over MgSO4
6. customevaporated in vacuo
7. customThe crude product was purified by silica gel flash chromatography (5% EtOAc-95% hexanes)