[S:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[NH:10][C:11]([C:13]1[CH:14]=[CH:15][CH:16]=[C:17]2[C:22]=1[CH2:21][N:20]([C:23]1[S:24][C:25]([I:32])=[C:26]([C:28]([O:30][CH3:31])=[O:29])[N:27]=1)[CH2:19][CH2:18]2)=[O:12].Cl[CH2:34][O:35][CH2:36][CH2:37][Si:38]([CH3:41])([CH3:40])[CH3:39].C(N(CC)CC)C>ClCCl>[S:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[N:10]([CH2:34][O:35][CH2:36][CH2:37][Si:38]([CH3:41])([CH3:40])[CH3:39])[C:11]([C:13]1[CH:14]=[CH:15][CH:16]=[C:17]2[C:22]=1[CH2:21][N:20]([C:23]1[S:24][C:25]([I:32])=[C:26]([C:28]([O:30][CH3:31])=[O:29])[N:27]=1)[CH2:19][CH2:18]2)=[O:12]To a solution of Example 15A (2.0 g) and (2-(chloromethoxy)ethyl)trimethylsilane (1.2 g) in dichloromethane (20 mL) was added triethylamine (1.55 g). The mixture was stirred at room temperature overnight and concentrated. The residue was purified by flash chromatography, eluting with 20% ethyl acetate in hexane, to give the title compound.
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