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Lewis acid-mediated [3+2] cycloaddition between hydrazones and olefins |
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| Authors: | Shū Kobayashi Ryoji HirabayashiHaruka Shimizu Haruro IshitaniYasuhiro Yamashita |
| Affiliation: | Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan |
| Abstract: | [3+2] Cycloaddition between hydrazones and olefins was accelerated in the presence of a stoichiometric amount of BF3·OEt2 or a catalytic amount of Zr(OTf)4, Hf(OTf)4, or Sc(OTf)3 under mild conditions. The corresponding pyrazolidine derivatives were obtained in moderate to high yields using this novel [3+2] Lewis acid catalysis. |
| Keywords: | [3+2] cycloaddition hydrazone Lewis acid intramolecular intermolecular |
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