[Si:1]([O:8]S(C(F)(F)F)(=O)=O)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[Br:16][C:17]1[CH:22]=[CH:21][C:20]([C:23]2(O)[CH2:26][CH2:25][CH2:24]2)=[CH:19][CH:18]=1.C(N(CC)CC)C.C([O-])(O)=O.[Na+]>ClCCl>[Br:16][C:17]1[CH:22]=[CH:21][C:20]([C:23]2([O:8][Si:1]([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2])[CH2:26][CH2:25][CH2:24]2)=[CH:19][CH:18]=1TBSOTf (360 μL, 1.57 mmol) was added to a 0° C. solution of 3-1 (235 mg, 1.04 mmol) and triethylamine (450 μL, 3.23 mmol) in dichloromethane (3 mL). The reaction was allowed to warm to room temperature and after 1 h, saturated NaHCO3 solution was added. The resulting mixture was extracted with ethyl acetate (3×30 mL) and the combined ethyl acetate solution was washed with brine. The solution was then dried (Na2SO4), filtered and evaporated. Purification by flash chromatography on silica gel (hexanes) gave 3-2 (329 mg, 93%).
読み込み中…
