A novel copper-catalyzed [5 + 1] annulation of 2-ethynylanilines with an N,O-acetal, which functioned as a Cl part, leading to the preparation of quinoline derivatives with an ester substituent on the 2-position is described. A combination of CuBr2 and trifluoroacetic acid (TFA) promoting [5 + 1] annulation of the 2-ethynylaniline with ethyl glyoxylate is also demonstrated.
A dramatic enhancing effect of InBr<sub>3</sub> towards the oxidative Sonogashira cross-coupling reaction of 2-ethynylanilines
A dramatic enhancing effect of InBr3 was observed towards the oxidative Sonogashira cross-coupling reaction of 2-ethynylaniline with (E)-trimethyl(3,3,3-trifluoroprop-1-enyl)silane.