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The addition of pyridine N-oxide is necessary to obtain high enantioselectivities in the asymmetric aziridination of styrene derivatives through transfer of a nitrogen atom from chiral, toluenesulfonic anhydride activated nitridomanganese complex 1 Eq. (a). Remarkably, high stereospecificity was observed in all the aziridinations of trans- and cis-1,2-disubstituted alkenes. R1=H, Me, nPr, iPr; R2=H, Me; Ts=p-toluenesulfonyl.
Minakata et al. (Thu,) studied this question.