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Slightly better regioselectivity was obtained in the ring-opening reaction of aziridine 2b and 3a in comparison with what was received with 1d (4.1:1).
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This catalytic cycle might not account for the ring opening of aziridines by α,β-unsaturated aldehydes. The intramolecular redox of α,β-unsaturated aldehydes promoted by carbene to give the saturated carboxylic acid, and subsequently ring opening of the aziridines, should not be ruled out. See ref 7k-o.
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