“…Isoquinoline derivatives evince a wide range of biological activities. For example, partially hydrogenated isoquinoline derivatives can act as antagonists of dopamine receptors, exhibit antiproliferative, antitumor, anthelmintic, analgesic, antimicrobial, antibacterial, and other activities . In synthesis of 3,4‐dihydroisoquinolines and their derivatives, the most frequently used reactions are those of Bischler–Napieralsky, Pictet–Spengler, and Pomeranz–Fritsch .…”