反应详情

To a solution of the product of Example 5A (544.5 mg, 2.59 mmol) in anhydrous DMF (26 mL) was added imidazole (264 mg, 3.89 mmol) and TBDMS-Cl (586 mg, 3.89 mmol). The reaction mixture stirred at room temperature overnight and was quenched with water. The aqueous layer was extracted with ethyl acetate (3×). All combined organic layers were dried over Na2SO4, filtered, and concentrated. The crude material was purified using silica gel chromatography (4:1 pentane:ethyl acetate) to provide the desired product (677.5 mg, 2.19 mmol) in 84% yield. 1H (CDCl38.01, 600 MHz): δ (2H, d, J=8.3 Hz), 7.42 (2H, d, J=8.4 Hz), 4.63 (2H, s), 3.91 (2H, s), 3.82 (2H, t, J=5.0), 3.58 (2H, t, J=5.1 Hz), 0.91 (9H, s), 0.07 (6H, s); 13C (CDCl3166.5, 143.5, 129.2, 128.8, 126.5, 72.1, 71.6, 150 MHz): δ 62.3, 51.5, 25.4, 17.9, −5.8.

1. customwas quenched with water
2. extractionThe aqueous layer was extracted with ethyl acetate (3×)
3. dry with materialAll combined organic layers were dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude material was purified