Potassium ethanethioate → 1-[3-Acetylthio-3-(4-bromobenzoyl)propionyl]-L-proline

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Reaction Steps

To a stirred suspension of 469 mg. of potassium thioacetate in 10 ml. of ethanol is added 1.76 g. of 1-[3-(4-bromobenzoyl)-3-bromopropionyl]-L-proline (Example 37). The mixture is stirred at room temperature for 18 hours, filtered and the filtrate evaporated to dryness. The residue is dissolved in dichloromethane, washed with water and saturated sodium chloride solution, dried over magnesium sulfate and evaporated to dryness in vacuo giving the desired product as 1.68 g. of a white glass.

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