[CH3:1][C:2]([CH3:26])([CH3:25])[CH2:3][O:4][C:5]1[C:10]([O:11][CH3:12])=[CH:9][CH:8]=[CH:7][C:6]=1/[CH:13]=[CH:14]/[C:15]1[N:16]=[C:17]2[S:24][CH:23]=[CH:22][N:18]2[C:19](=[O:21])[CH:20]=1.[I:27]N1C(=O)CCC1=O.C1(COC2C(OC)=CC=CC=2/C=C/C2N=C3SC=CN3C(=O)C=2I)CC1>C(#N)C>[CH3:1][C:2]([CH3:26])([CH3:25])[CH2:3][O:4][C:5]1[C:10]([O:11][CH3:12])=[CH:9][CH:8]=[CH:7][C:6]=1/[CH:13]=[CH:14]/[C:15]1[N:16]=[C:17]2[S:24][CH:23]=[CH:22][N:18]2[C:19](=[O:21])[C:20]=1[I:27]A solution of Step 1 intermediate (275 mg, 5.816 mmol) was treated with N-iodosuccinimide (143 g, 6.327 mmol) in acetonitrile (10 ml) according to the procedure described in Step 4 of Intermediate 2 to afford a crude product which was purified by column chromatography using 2% ethyl acetate in chloroform as eluent to afford 510 mg of the desired compound as a yellow solid; 1H NMR (300 MHz, DMSO-d6) 1.08 (s, 9H), 3.58 (m, 2H), 3.81 (m, 3H), 7.07-7.12 (m, 2H), 7.30-7.33 (m, 2H), 7.41-7.48 (m, 1H), 7.94-7.96 (m, 1H), 8.23-8.29 (m, 1H); ESI-MS (m/z) 497.21 (M+H)+.
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