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Synthesis 2005(12): 2046-2054
DOI: 10.1055/s-2005-870027
DOI: 10.1055/s-2005-870027
SPECIALTOPIC
© Georg Thieme Verlag Stuttgart · New York
Diastereoselective Intramolecular Ester Transfer Reaction of N-Alkenylcarbamate Derivatives Mediated by Zirconocene-Butene Complex: Preparation of α,γ-Disubstituted γ-Aminobutyric Acid (GABA) Derivatives and 2,4-Disubstituted Pyrrolidine Derivatives
Further Information
Received
14 February 2005
Publication Date:
14 July 2005 (online)
Publication History
Publication Date:
14 July 2005 (online)
Abstract
Zirconium-mediated diastereoselective alkene-carbonyl coupling reactions of N-alkenylcarbamate derivatives are reported. The present alkene-carbonyl coupling reactions using chiral tert-butyl 3-butenylcarbamates having a substituent at the homoallylic position proceeded in a highly diastereoselective manner to give α-methyl-γ-substituted γ-aminobutyric acid (GABA) derivatives. Iodination of the intermediary zirconium species gave the α-iodomethylated γ-aminobutyrates, which were, in turn, converted to the 5-substituted pyrrolidine-3-carboxylate having cis stereochemistry.
Key words
zirconium - cyclization - pyrrolidines - amino acids
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