[CH2:1]([SH:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(=O)([O-])[O-].[Cs+].[Cs+].Br[CH2:16][C:17](=[O:29])[CH2:18][N:19]1[C:23](=[O:24])[C:22]([CH3:26])([CH3:25])[N:21]([CH3:27])[C:20]1=[O:28].O>CN(C)C=O>[CH2:1]([S:8][CH2:16][C:17](=[O:29])[CH2:18][N:19]1[C:23](=[O:24])[C:22]([CH3:25])([CH3:26])[N:21]([CH3:27])[C:20]1=[O:28])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1Benzyl mercaptan (256 μl, 2.2 mmol) was stirred with cesium carbonate (712 mg, 2.2 mmol) in dimethyl formamide (5 ml) at room temperature for 1 hour. 3-(3-bromo-2-oxopropyl)-1,5,5-trimethylimidazolidine-2,4-dione (552 mg, 1.99 mmol) prepared as in WO99/06361 was added and the mixture stirred 18 hours at room temperature. The reaction mixture was treated with water, extracted into ethyl acetate (3×25 ml), the organic phases combined, brine washed and dried. The product was purified by silica chromatography, eluting with 50% ethyl acetate/iso-hexane to give 300 mg product.
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