A Novel Ring Transformation of Benzofuroxanes to 1-Hydroxy-2-arylbenzimidazole-3-N-oxide with Nitrones

Abstract

e r o c y c l i c r i n g of 1 i n t h e r e a c t i o n w i t h n l t r o n e s (5) .irhen EE'O (la) was r e a c t e d w i t h equimolar q u a n t i t i e s of n i t r o n e (?a) i n r e f l u x i n g benzene f o r 4 h, 1-hydroxy-2-phenyl-benzinlldazole-3-N-oXrde (?a) was i s o l a t e d