[Cl:1][C:2]1[CH:12]=[CH:11][CH:10]=[C:9]([Si:13]([CH3:16])([CH3:15])[CH3:14])[C:3]=1[C:4]([NH:6][CH2:7][CH3:8])=[O:5].C[Si]([N-][Si](C)(C)C)(C)C.[Na+].Cl[CH2:28][S:29][CH3:30]>C1COCC1>[Cl:1][C:2]1[CH:12]=[CH:11][CH:10]=[C:9]([Si:13]([CH3:15])([CH3:14])[CH3:16])[C:3]=1[C:4]([N:6]([CH2:7][CH3:8])[CH2:28][S:29][CH3:30])=[O:5]To a solution of 2.0 g (7.8 mmol) of the compound of Example 45 in 30 mL dry THF was added 7.9 mL (7.9 mmol) sodium bis(trimethylsilyl)amide (1.0 M in THF). To the resulting mixture was added 1.0 g (10.4 mmol) chloromethyl methylsulfide. The mixture was stirred for 15 min and another 0.65 g (6.7 mmol) of chloromethyl methylsulfide was added. Stirring at RT was continued for 1 h and the mixture was then heated to reflux for 28 hours. The mixture was allowed to cool to RT and was then partitioned between ether and water. The organic layer was washed with brine, dried (MgSO4), and was filtered through silica gel. The filtrate was evaporated in vacuo and the residue was chromatographed (HPLC, 8% ethyl acetate/hexane) to yield 1.1 g (45%) of a colorless oil. nD25=1.5526.
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