An efficient stereoselective route to (2S,4R)-4-hydroxyproline from (S)-O-benzylglycidol has been established via a novel iodine-mediated cyclization of the N-benzoyl-γ,δ-unsaturated amide.
S. Takano, Y. Iwabuchi and K. Ogasawara, J. Chem. Soc., Chem. Commun., 1988, 1527 DOI: 10.1039/C39880001527
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