Visible-light-induced photocatalyst-free cascade cyclization of 3-(2-(ethynyl)phenyl)quinazolinones to sulfonated quinolino[2,1-b]quinazolinones

A visible-light-induced K 2 S 2 O 8 -promoted cascade sulfonation/cyclization reaction to afford a series of sulfonated quinolino[2,1- b ]quinazolinones has been developed under mild conditions.