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Synlett 2001; 2001(2): 0243-0247
DOI: 10.1055/s-2001-10782
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Tandem 4 + 3 Cycloaddition/Nucleophilic Trapping Reactions of Butyne-1,4-diether Dicobalt Hexacarbonyl Complexes

Yafan Lu* , James R. Green
  • *Chemistry and Biochemistry, School of Physical Sciences, University of Windsor, Windsor, Ontario, N9B 3P4, Canada; Fax (519)-973-7098; E-mail: jgreen§uwindsor.ca
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Publication Date:
31 December 2001 (online)

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Butyne-1,4-diether hexacarbonyldicobalt complexes 1 undergo Lewis acid mediated 4 + 3 cycloadditions with allylsilanes, incorporating halide from the Lewis acid to give halocycloheptynes 4, 6, 7. A phenyl group may be incorporated in place of the halogen (to give 8) by use of benzene as solvent and with B(C6F5)3 as the Lewis acid; chlorobenzene and toluene also participate in the process.

alkyne complexes - cobalt - ring closure - Lewis acids - nucleophiles

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