Аннотация:Exhibiting a wide spectrum of practical applications, benzo[d]oxazol-2(3H)-ones (BOA) are considered as key intermediates in the synthesis of pharmaceutical products, organic dyes and OLED materials among others.Herein we propose an environmentally benign protocol for the selective mono-halogenation of benzo[d]oxazol - 2(3H)-ones. Several chloro- and bromo-substituted BOA derivatives were prepared within less than an hour with high to excellent yields (75-93%) via this novel, green and energy sufficient method. This rapid and highly reproducible synthetic approach employs inexpensive commercially available urea-hydrogen peroxide complex (UHP) and hydrochloric or hydrobromic acid. Simple operations, precise control over the oxidative halogenation, with water being the major by-product of the reaction outcome are among the strong point ofcurrent facile method from the perspective of green chemistry.
