反应详情

温度

60 °C

To a solution of 6-methoxymethoxy coumarin 17a (21 g, 0.102 mol) and Pd(OAc)2 (2.75 g, 0.012 mol) in 500 mL THF add 2-(acetoxymethyl)allyl-trimethylsilane (26 mL, 0.122 mol) followed by triisopropyl phosphite (18.1 mL, 0.073 mol). After stirring at 60° C. overnight, cool the solution to RT, concentrate under reduced pressure, and dilute with EtOAc. Wash the solution with saturated aqueous sodium bicarbonate and brine. Dry over Na2SO4, and then concentrate to an oil. Purify the material by silica gel chromatography (Biotage 40M+65M columns, 10 to 30% EtOAc/Hex over 60 min at 50 mL/min followed by 30 to 50% EtOAc/Hex over 60 min at 50 mL/min) to give 18.3 g (0.070 mol, 69%) of cyclopentanoid 18 and 3.8 g (18.3 mmol, 18%) of recovered starting material. HRMS (ES+) calc for C15H17O4: 261.1127, found: 261.1122 (M+1).

1. temperaturecool the solution to RT
2. concentrationconcentrate under reduced pressure
3. additiondilute with EtOAc
4. washWash the solution with saturated aqueous sodium bicarbonate and brine
5. dry with materialDry over Na2SO4
6. concentrationconcentrate to an oil
7. customPurify the material by silica gel chromatography (Biotage 40M+65M columns, 10 to 30% EtOAc/Hex over 60 min at 50 mL/min followed by 30 to 50% EtOAc/Hex over 60 min at 50 mL/min)
8. customto give 18.3 g (0.070 mol, 69%) of cyclopentanoid 18 and 3.8 g (18.3 mmol, 18%)
9. customof recovered