Scheme 3.
Reagents and conditions: (i) Benzene, 1-butanol, 100 °C, 2 h, 77%; (ii) Tris[(1-benzyl-1H-1,2,3-triazol-4-yl)methyl]amine (TBTA) Cu(I)Br, triethylamine, CHCl3, rt, 12 h, 92%.
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