Substituted pyrazolines were obtained by Ni(ClO 4 ) 2 · 6H 2 O‐catalyzed reaction of 1,5‐diazabicyclo[3.1.0]hexanes with donor‐acceptor cyclopropanes. The mechanism of this reaction includes alkylation of diaziridine nitrogen with Lewis acid‐activated donor‐acceptor cyclopropane followed by hydration of the formed 1,6‐zwitterionic intermediate and oxidation of pyrazolidine with air oxygen. This pathway is realized when starting bicyclic diaziridines have bulky alkyl substituent(s) at the C(6) atom preventing (3+3)‐annulation of two three‐membered rings.
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Chagarovskiy et al. (2019) studied this question.
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