反应详情

(2S,3S)-N-(4-Ethylsulfanyl-thiazol-2-yl)-2-{(R)-4-[4-(2-methoxy-ethoxy)-phenyl]-2,5-dioxo-imidazolidin-1-yl}-3-phenyl-butyramide (0.135 g, 0.24 mmole) (prepared as described in Example 16) was dissolved in anhydrous tetrahydrofuran (15 mL). To this solution was added a solution of m-chloroperbenzoic acid (0.066 g, 0.27 mmole) in tetrahydrofuran (8 mL). After stirring at room temperature for 30 minutes, the reaction was concentrated. The residue was dissolved in cold methylene chloride and washed twice with saturated sodium bicarbonate and twice with brine. Each aqueous phase was backwashed with a second portion of methylene chloride. The two organic phases were combined, dried over sodium sulfate and concentrated. The crude material was purified by chromatography over silica gel eluted with a gradient of 50-100% v/v ethyl acetate in hexanes followed by 5% v/v methanol in ethyl acetate to yield (2S,3S)-N-(4-ethanesulfinyl-thiazol-2-yl)-2-{(R)-4-[4-(2-methoxy-ethoxy)-phenyl]-2,5-dioxo-imidazolidin-1-yl}-3-phenyl-butyramide (0.103 g, 75%). This material was combined with another batch of material, dissolved in methylene chloride and added to hexanes to precipitate the product, (2S,3S)-N-(4-ethanesulfinyl-thiazol-2-yl)-2-{(R)-4-[4-(2-methoxy-ethoxy)-phenyl]-2,5-dioxo-imidazolidin-1-yl}-3-phenyl-butyramide (0.117 g).

1. concentrationthe reaction was concentrated
2. dissolutionThe residue was dissolved in cold methylene chloride
3. washwashed twice with saturated sodium bicarbonate and twice with brine
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated
6. customThe crude material was purified by chromatography over silica gel
7. washeluted with a gradient of 50-100% v/v ethyl acetate in hexanes