Carbon Nitride-Catalyzed Photoredox Sakurai Reactions and Allylborations

Within the last couple of years, the photocatalytic, oxidative CC coupling has grown to a well‐established methodology, especially for the modification of aryl‐substituted tetrahydroisoquinoline derivatives. However, until now, this reaction is mainly restricted to the usage of strong nucleophiles like nitroalkanes, cyanides, enamines, phosphonates and malonates. Within this publication we present an extension of such a method towards the application of weaker nucleophiles, namely allylstannanes, allylsilanes and allylboranes. Therefore, a very simple protocol was invented, using heterogeneous mesoporous graphitic carbon nitride (mpg‐C3N4) as catalyst and air as oxidizing agent, leading to high yields for a broad range of substrates.