An efficient approach to the synthesis of 2,1-benzisoxazoles through direct construction
of the N–O bond by the chemoselective oxidation of 2-aminoacylbenzenes with Oxone
is described. This alternative methodology is characterized by its simple and transition-metal-free
conditions and good functional group compatibility utilizing Oxone as a green oxidant
instead of hypervalent iodine compounds. Moreover, this new procedure simplifies the
number of steps compared to the previously reported procedure by circumventing the
use of 2-azido-substituted aryl ketones.
Key words
Oxone - 2,1-benzisoxazoles - 2-aminoacylbenzenes - oxidative cyclization - transition-metal-free