The synthesis of thiazolo [5,4-a] acridines and acridin-9(10H)-ones by cyclisation of anthranilic acids is described. NMR (specially H-1 NMR) was used to ascertain their 'bent' structure.
Ultrasonic irradiation of the ullmann condensation: Application to the preparation of dioxolo, dioxino, cyclopent, and imidazolo anthranilic acid derivatives
The synthesis of N-aryl anthranilicacid derivatives bearing dioxolo, dioxino, cyclopent, and imidazolo supplementary ring systems is reported. The Ullmann-Goldberg condensation of the N-aryl anthranilicacid is improved in yield and reaction time, compared to conventional heating; by ultrasonic irradiation.