Fig. 1: The significance of QUINOL and its synthetic approaches.

a QUINOL and representative biaryl isoquinoline structures. b Current strategy: transition-metal-catalyzed cross-coupling. c Our strategy: metal-free oxidative cross-coupling.
a QUINOL and representative biaryl isoquinoline structures. b Current strategy: transition-metal-catalyzed cross-coupling. c Our strategy: metal-free oxidative cross-coupling.