[H-].[Na+].[O:3]=[C:4]1[N:8]([C:9]2[CH:16]=[CH:15][C:12]([C:13]#[N:14])=[C:11]([C:17]([F:20])([F:19])[F:18])[CH:10]=2)[C:7](=[O:21])[C:6]2([CH2:26][CH2:25][O:24][CH2:23][CH2:22]2)[NH:5]1.CS(C)=O>O>[O:3]=[C:4]1[N:8]([C:9]2[CH:16]=[CH:15][C:12]([C:13]#[N:14])=[C:11]([C:17]([F:20])([F:18])[F:19])[CH:10]=2)[C:7](=[O:21])[C:6]2([CH2:26][CH2:25][O:24][CH2:23][CH2:22]2)[N:5]1[CH2:23][CH2:22][CH2:6][CH2:7][OH:21]55 mg of 50% sodium hydride were introduced and 340 mg of the product of Example 2 and 25 ml of dimethylsulfoxide were added dropwise over 25 minutes. Rinsing was carried out with 0,5 ml of dimethylsulfoxide and 20 minutes after the release of hydrogen had stopped, 0.41 g of 4-iodobutoxy-trimethyl-silane was added. The mixture was allowed to react for 18 hours at ambient temperature and the reaction medium was then poured into 10 ml of water. Extraction was carried out 4 times with ether and the organic phase was washed with water, then with salt water, dried and taken up in a mixture of 10 ml of methanol and 1 ml of 2N hydrochloric acid. After 30 minutes, the mixture was poured into 20 ml of saturated sodium chloride solution and extraction was carried out 3 times with chloroform, followed by drying. Purification was carried out on silica with methylene chloride-acetone 8-2 as eluant to obtain 369 mg of the expected product (friable white foam).
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