One Pot Synthesis of Some New Spiro[3<i>H</i>-Indol-3,5′(4′<i>H</i>)-[1,2,4] Oxadiazol]-2-Ones and Bis[Spiro[3<i>H</i>-Indol-3,5′(4′<i>H</i>)-[1,2,4] Oxadiazol]-2-Ones]

Abstract

Abstract A facile preparation of the title compound by 1,3-dipolar cycloaddition reaction of benzonitrile oxides with isatin imines or isatin diimines, in excellent yield, are reported.