This compound is a chiral N-sulfinyl protected amine intermediate, featuring a (R)-tert-butanesulfinamide group attached to the (S)-1-position of 1,3-dihydrospiro[indene-2,4'-piperidine]. It is used in asymmetric synthesis for the preparation of enantiomerically pure spirocyclic amines, particularly in pharmaceutical development targeting CNS or other therapeutic areas requiring high stereochemical control. The sulfinamide protecting group ensures stability during synthetic manipulations and can be readily removed under mild acidic conditions to yield the free amine with retained enantiopurity. This makes it valuable as an advanced intermediate in multi-step routes toward active pharmaceutical ingredients (APIs) with specific stereoisomers for optimal biological activity.