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.