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Reagents and conditions: (a)6 (1) NaNO2, H2SO4, (2) KI, water, (3) hex-1-yn-1-yl copper, pyridine; (b) urea, DMF; (c) [RhIIICp·(MeCN)3](SbF6)2, TFE, 120 °C, 14 h, (2) DMAP, TFE, 140 °C, 14 h.
