One‐Pot Synthesis of 1‐Arylmethyl‐4‐[(E)‐alk‐1‐enyl]‐1H‐1,2,3‐triazoles via a Cross‐Coupling/Click Reaction Sequence.

1-Arylmethyl-4-[(E)-alk-1-enyl]-1H-1,2,3-triazoles have been synthesized from terminal conjugated (E)-enynes, prepared by copper-mediated cross-coupling reaction of (E)-alk-1-enyldisiamylboranes with (trimethylsilyl)ethynyl bromide, benzyl bromides and sodium azide in a one-pot fashion. In this cross-coupling/click reaction sequence, the copper precursor Cu(acac)2 can serve as a tandem catalyst.