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Chiral auxiliary is a compound or unit that is temporarily added to organic synthesis in order to control the synthesis of stereochemistry. As the figure below shows, by adding the chiral auxiliary, the prochiral substrate can be transformed into a chiral product. Moreover, through an auxiliary recycle, the auxiliary can be typically recovered for future use. As an auxiliary for chiral synthesis, it must have the following conditions: the synthesis procedure must be highly stereoselective; if used as raw material, the newly generated chiral center or other chiral elements should be easily separated from chiral auxiliary without racemization; it has high recovery without reducing the optical purity.
