Triphenylphosphine → Methyl (2S)-2-benzyloxycarbonylamino-4-cyanobutyrate

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A solution of N-benzyloxycarbonyl-L-glutamine methyl ester (25 g) in THF (500 ml) was added dropwise to a stirred solution of triphenylphosphine (44.5 g) in carbon tetrachloride (1 L). The mixture was heated to 50° C. for 2 hours. The mixture was evaporated. The resultant oil was triturated in ethyl acetate. The mixture was filtered and the filtrate was evaporated. The residue was purified by column chromatogaphy using a 1:1 mixture of hexane and ethyl acetate as eluant. There was thus obtained methyl (2S)-2-benzyloxycarbonylarnino-4-cyanobutyrate (19.38 g, 83%).

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