Br[C:2]1[O:6][C:5]([C:7]([O:9][CH2:10][CH3:11])=[O:8])=[CH:4][CH:3]=1.C(#N)C.[C:15]([Si:17]([CH3:20])([CH3:19])[CH3:18])#[CH:16].P([O-])(O)(O)=O.[Na+]>[Cu](I)I.C(N(CC)CC)C>[CH3:18][Si:17]([C:15]#[C:16][C:2]1[O:6][C:5]([C:7]([O:9][CH2:10][CH3:11])=[O:8])=[CH:4][CH:3]=1)([CH3:20])[CH3:19]A solution of 5 g of the product of Stage A, 15 ml of acetonitrile, 15 ml of triethylamine, 4.5 ml of ethynyltrimethylsilane, 170 mg of (triphenylphosphine)palladium chloride and 30 mg of copper iodide was heated at 40° C. for 2 and a half hours and then allowed to return to room temperature and was poured into an aqueous sodium dihydrogenphosphate solution. The mixture was extracted with ethyl acetate and the extract was washed with water and dried. The solvent was evaporated to obtain after chromatography on silica (eluent: 95/5 hexane/ethyl acetate) 4.75 g of the expected product.
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