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Synthesis 2006(7): 1183-1189
DOI: 10.1055/s-2006-926371
DOI: 10.1055/s-2006-926371
PAPER
© Georg Thieme Verlag Stuttgart · New York
Solvent-Free Heck-Jeffery Reactions under Ball-Milling Conditions Applied to the Synthesis of Unnatural Amino Acids Precursors and Indoles
Further Information
Received
29 September 2005
Publication Date:
08 March 2006 (online)
Publication History
Publication Date:
08 March 2006 (online)
Abstract
The syntheses of various amino- and hydroxy-substituted dehydrophenylalanine derivatives using the Heck-Jeffery protocol under non-solvent conditions in a ball mill are presented. The influences of electron-withdrawing groups and of the location of the heteroatom substituent relative to the halide are discussed. Suitably substituted ortho-amino dehydrophenylalanine derivatives undergo a cyclization-elimination reaction to the corresponding 2-substituted indoles.
Key words
cyclizations - indoles - green chemistry - Heck reaction - palladium
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