[OH:1][CH:2]1[C:7]2[CH:8]=[CH:9][S:10][C:6]=2[S:5](=[O:12])(=[O:11])[NH:4][CH2:3]1.[H-].[Na+].[CH2:15](Br)[CH:16]=[CH2:17]>CN(C=O)C>[CH2:17]([N:4]1[CH2:3][CH:2]([OH:1])[C:7]2[CH:8]=[CH:9][S:10][C:6]=2[S:5]1(=[O:12])=[O:11])[CH:16]=[CH2:15]The product from Step C of Example 2 (4.0 g, 19.5 mmol) was dissolved in anhydrous DMF (70 mL) cooled to -10° C. and sodium hydride (21.5 mmol) was added. After stirring for five minutes allyl bromide (2.53 mL, 29.25 mmol) was added and this mixture stirred for 2 h at 0° C. The reaction mixture was poured onto ice water (100 mL) and this solution was extracted with ethyl acetate. The combined extracts were washed with brine, dried (MgSO4) and evaporated to give a crude product which was purified by column chromatography (silica, methylene chloride:methanol, 20:1) to provide the desired product (4.2 g, 88%) as a syrup.
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