“…However, this DABCO‐promoted cyclization reaction employs an unstable starting compound, o ‐alkynylaryl isocyanide, which was synthesized through the dehydration of N ‐formylamide by the use of a harsh reagent, POCl 3 , and a large excess of ( i Pr) 2 EtN (8 equiv.). Recently, quinoline N ‐oxides have been well studied in the selective construction of C2–C, C2–N, and C2–S bonds. Comparatively, there are only few reports in the literature concerning the selective construction of C2–O bonds .…”