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can be performed in open air, and utilizes only a small amount of a cheap and readily available catalyst (2.5 to 10 mol% CuI). It proficiently produced a variety of biphenylacetylene tethered propargylamines, alkyne tethered dihydroisoquinolines, and N-fused benzimidazoles with excellent regioselectivity.
Chaturvedi et al. (Wed,) studied this question.