Novel Extensions of the <i>tert</i>-Amino Effect: Formation of Phenanthridines
and Diarene-Fused Azocines from <i>ortho</i>-<i>ortho</i>′-Functionalized Biaryls
azocines fused to two benzene rings or one benzene and one pyridazinone ring, which are otherwise difficult to access, were prepared via two new extensions of the tert- ' amino effect. The synthetic pathway includes three steps:i) Suzuki ] reaction of an ortho-functionalized phenylboronic acid with ortho- ] disubstituted benzenes or pyridazinones; ii) the Knoevenagel condensation reaction of the biaryl