Regioselective synthesis of enantiopure 1,2- and 1,3-dispirooxindoles along with a DFT study

The regio- and diastereoselective synthesis of rigid framework dispirooxindole [indolizidine, pyrrolizidine, and pyrrolidine] derivatives as enantiopure products in 1,2 and 1,3-dispiro regioisomeric forms is reported.