[Si:1]([O:8][CH2:9][C@H:10]1[CH2:14][CH2:13][C:12](=[O:15])[N:11]1[CH2:16][C:17]([NH2:19])=O)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:29])=CC=1.C(=O)(O)[O-].[Na+].C(OCC)(=O)C>C(Cl)Cl>[Si:1]([O:8][CH2:9][C@H:10]1[CH2:14][CH2:13][C:12](=[O:15])[N:11]1[CH2:16][C:17](=[S:29])[NH2:19])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]To a solution of the compound 67 (9.50 g) in methylene chloride (133 mL) was added Lawesson's reagent (6.71 g) at 0° C. and the solution was stirred for 3 Hours. To the reaction solution was added an aqueous saturated sodium bicarbonate solution and ethyl acetate and then the solution was separated. The aqueous layer was extracted with ethyl acetate. The combined organic layer was washed with an aqueous saturated sodium bicarbonate solution and brine, dried over anhydrous sodium sulfate and concentrated. The obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate:methanol=60:40:033:67:00:90:10) to give the title compound (5.30 g) having the following physical data.
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