O=P(Cl)(Cl)Cl.[CH2:6]([N:13]1[C:21]2[C:16](=[CH:17][CH:18]=[C:19]([O:22][CH3:23])[CH:20]=2)[CH:15]=[C:14]1[CH:24]([CH3:26])[CH3:25])[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.CN([CH:30]=[O:31])C>CCOC(C)=O>[CH2:6]([N:13]1[C:21]2[C:16](=[CH:17][CH:18]=[C:19]([O:22][CH3:23])[CH:20]=2)[C:15]([CH:30]=[O:31])=[C:14]1[CH:24]([CH3:26])[CH3:25])[C:7]1[CH:8]=[CH:9][CH:10]=[CH:11][CH:12]=1POCl3 (0.48 ml, 5.23 mmol) was added dropwise to anhydrous DMF (2 ml) at 0° C. under argon. After stirred for 30 min, this solution was added dropwise to a solution of 1-benzyl-2-isopropyl-6-methoxy-1H-indole (Compound 4, 583 mg, 2.09 mmol) in anhydrous DMF (8 ml) at 0° C. under argon. The reaction was stirred for 1 h at 0° C. and 30 min at room temperature, diluted with EtOAc, washed with aqueous NaHCO3, brine, dried over Na2SO4, and concentrated in vacuo. The residue was purified by chromatography on silica gel (0→30% EtOAc-hexanes) to yield the title compound as a light yellow syrup.
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