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Sydnone-based Approach to Hetero-helicenes Through 1,3-Dipolar-Cycloadditions.

著者 Yen-Pon E , Champagne PA , Plougastel L , Gabillet S , Thuery P , Johnson M , Muller G , Pieters G , Taran F , Houk KN , Audisio D
J Am Chem Soc.2019 Jan 10 ; ():.
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The first approach to pyrazole containing helicenes via sydnone-aryne [3+2]-cycloaddition is described. An unprecedented regioselectivity in the cycloaddition step towards the more sterically constrained product was observed in presence of extended aromatic scaffolds. DFT calculations enabled to understand the origin of this unexpected selectivity.
PMID: 30628450 [PubMed - as supplied by publisher]
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