“…As shown in Scheme 2 , the mono- and di-substituted 1,8-naphthalimide esters were synthesized via three steps. Although many efforts have been made to prepare 1,8-naphthalimide derivatives with different substitutions at position 4 [ 1 , 9 , 10 , 24 , 25 , 26 , 27 , 28 ], this is the first attempt to synthesize mono- and di-substituted 1,8-naphthalimide esters simultaneously at position 4. N -n-Butyl-4-bromo-1,8-naphthalimide was prepared by the convenient substitution of 4-bromo-1,8-naphtalic anhydride with n-butyl amine.…”