I know they do it like that and turn back in the synthetic scheme only to prove that CAN catalyzed aziridine - aminoalcohol conversion is possible. But there are many ways of creating an aziridine. Then the method will be useful to open the ring. Not futile i think.
Here's an example of a aziridine synth. method
A Convenient Method for the Synthesis of 2-Arylaziridines from Styrene Derivatives via 2-Arylethenyl(diphenyl)sulfonium Salts
Styrene derivatives reacted with diphenyl(trifluoromethanesulfonyloxy)sulfonium trifluoromethanesulfonate (1) at low temperature to afford 2-arylethenyl(diphenyl)sulfonium triflates (2). Treatment of 2 with primary amines gave the corresponding 2-arylaziridines in high yields. One-pot synthesis of various aziridines was also successfully carried out without isolation of the intermediate 2
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Note without reference.
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