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When N-deprotection was carried out on substrate I, pyrrolidine II was produced as major product. An X-ray crystal-structure analysis of II confirmed both structure and stereochemical assignment. We thank M. C. González-Rego for the synthesis of compounds I and II. [Diagram presented]
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The corresponding (E)-phenyl-2-pyridyl O-acyl oxime of acid 20 also furnished the desired cyclisized product in 40-45% yields.
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