Synthesis of Chiral Pyrrolidine Derivatives from (S)-Pyroglutamic Acid. I: 7-Substituted (2R,5S)-2-Aryl-1-aza-3-oxabicyclo(3.3.0)octan-8-ones, 7-Substituted (2R,5S)-2-Aryl-1-aza-3-oxabicyclo(3.3.0)oct-6-en-8-ones and 3-Substituted (S)-5-(Hydroxymethyl)-2-pyrrolidinones.

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