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Reagents and conditions: (i) hex-5-yn-1-yl trifluoromethanesulfonate, 2,6-di-tert-butyl-4-methylpyridine, DCM, from 0 °C to rt, 30% yield; (ii) RN3, Cu(MeCN)4PF6, TBTA, DMSO, rt, 20–62% yield; (iii) RN3, CuSO4, sodium ascorbate, MeOH, rt, 18–37% yield.
