Alkenes copper acetylides

Bhuvaneswari et al. [75] reported a copper-catalyzed three-component couphng of arynes, terminal alkynes, and activated alkenes, providing l-alkyl-2-alkynylben-zenes 108 (Scheme 5.72). 2-(Trimethylsilyl)-3,4-dimethylphenyl triflates 107 were used as benzene precursors. Reaction of terminal alkynes with Cu(l) species in the presence of CsF (or K COj) gives copper acetylides A. Alkynylcupration of the in situ-generated arynes B with cuprous acetylides A affords arylcuprous intermediates... 

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