期刊
TETRAHEDRON LETTERS
卷 44, 期 16, 页码 3351-3354出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(03)00606-3
关键词
[3+2] cycloaddition; hydrazone; Lewis acid; intramolecular; intermolecular
[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. (C) 2003 Elsevier Science Ltd. All rights reserved.
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