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Synlett 2011(16): 2321-2324
DOI: 10.1055/s-0030-1261217
DOI: 10.1055/s-0030-1261217
LETTER
© Georg Thieme Verlag
Stuttgart ˙ New York
Thermal [2+2] Cycloaddition of CF3-Substituted Allenynes: Access to Novel Cyclobutene-Containing α-Amino Acids
Further Information
Received
27 June 2011
Publication Date:
08 September 2011 (online)
Publication History
Publication Date:
08 September 2011 (online)
Abstract
An efficient approach for the preparation of novel CF3-substituted cyclic α-amino acid derivatives fused with cyclobutene ring has been developed. The method is based on intramolecular thermal [2+2] cycloaddition of amino acid containing allenynes with internal triple bond obtained by successive [2,3]-sigmatropic rearrangement of propargyl-containing nitrogen CF3-ylides and Sonogashira derivatization of the triple bond.
Key words
allenynes - Sonogashira coupling - [2+2] cycloaddition - cyclobutenes - amino acids
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