A facile and diverse synthesis of coumarin substituted spirooxindole and dispiro oxindole-pyrrolizidine/pyrrolothiazole/pyrrolidine derivatives via 1, 3-dipolar cycloaddition
A diverse series of coumarin substituted spirooxindole and dispirooxindole-pyrrolizidine/pyrrolothiazole/pyrrolidinederivatives have been obtained via azomethineylide specific three-component 1,3-dipolarcycloadditionreaction. This protocol features include operational simplicity, mild reaction conditions, high yields and a broad substrate scope.