The first asymmetric total synthesis of the hexacyclic veatchine-type C20-diterpenoid alkaloid (−)-garryine is presented. Key steps include a Pd-catalyzed enantioselective Heckreaction, a radical cyclization, and a photoinduced C–H activation/oxazolidine formation sequence. Of note, a highly enantioselective Heckreaction developed in this work provides efficient access to 6/6/6 tricyclic compounds