1,1'-Carbonyldiimidazole → HCID 54275061, compound

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Reaction Steps

A 0.01 mole sample of 3-benzoyl-2-(phenyl)propionic acid is dissolved in tetrahydrofuran and 0.01 mole of N,N-carbonyldiimidazole added. After stirring 3 hours at room temperature, 0.01 mole of L-proline t-butyl ester is added. After 24 hours the solvent is removed and 1-[3-benzoyl-2-(phenyl)-propionyl]-L-proline t-butyl ester isolated. The preceding compound is reacted with trifluoroacetic acid to remove the t-butyl group. Separation of isomers A and B is carried out as described for Example 69. Reaction of the isomers with bromine is acetic acid and reaction of the 1-[3-bromo-3-benzoyl-2-(phenyl)propionyl]-L-proline isomers with sodium thioacetate in acetonitrile as for Example 69 gives the products of the example. The product from isomer A is separated by chromatography to give [S-(R*,R*)] and [S-(R*,S*)]-1-[3-acetylthio-3-benzoyl-2-(phenyl)propionyl]-L-proline.

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