Enantioselective synthesis of β-fluoro-β-aryl-α-amino pentenamides by organocatalytic [2,3]-sigmatropic rearrangement
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The tetramisole-promoted catalytic enantioselective [2,3]-sigmatropic rearrangement of quaternary ammonium salts bearing a (Z)-3-fluoro-3-arylprop-2-ene group generates, after addition of benzylamine, a range of β-fluoro-β-aryl-α-aminopentenamides containing a stereogenic tertiary fluorine substituent. Cyclic and acyclic nitrogen substituents as well as various aromatic substituents are tolerated, giving the β-fluoro-β-aryl-α-aminopentenamide products in up to 76% yield, 96:4 dr, and 98:2 er.
Kasten , K , Slawin , A M Z & Smith , A D 2017 , ' Enantioselective synthesis of β-fluoro-β-aryl-α-amino pentenamides by organocatalytic [2,3]-sigmatropic rearrangement ' , Organic Letters , vol. 19 , no. 19 , pp. 5182-5185 . https://doi.org/10.1021/acs.orglett.7b02452
Copyright © 2017 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1021/acs.orglett.7b02452
DescriptionThe research leading to these results (K.K.) has received funding from the ERC under the European Union's Seventh Framework Programme (FP7/2007-2013) / ERC grant agreement n° 279850. A.D.S. thanks the Royal Society for a Wolfson Research Merit Award.
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