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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.