Bisphosphonium salt catalyzed [3 + 2] annulation of N-tosylimino(iso)quinolinium ylides with aryl olefins under blue LED irradiation

A visible-light-induced [3 + 2] annulation of N -tosylimino(iso)quinolinium ylides with aryl olefins, catalyzed by a bisphosphonium salt has been developed. Furthermore, the synthesis method of the bisphosphonium salts was improved.