An asymmetric formal [3 + 2]-cycloaddition between meso-aziridines and C3-alkylindoles mediated by an in situ generated magnesium catalyst was developed for asymmetric construction of pyrroloindolines. A variety of pyrroloindolines could be obtained by employing commercial available ligands with the assistance of an easily prepared achiral ligand.
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Wang et al. (2014) studied this question.
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