“…Recently, several cross-dehydrogenative couplings [31] of tetrahydroisoquinolines by homogeneous photocatalysis using Ir-or Ru-based complexes [5b,c, 7d, 8b,d, 15, 31] or organic dyes [33] such as Eosin Y [8a] have been reported. Here the photocatalytic key step is the reductive quenching of the excited chromophore leading to an amine radical cation, which is subsequently converted into an electrophilic iminium species.…”