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. Author manuscript; available in PMC: 2021 Mar 3.
Published in final edited form as: Trends Chem. 2020 Sep 2;2(10):874–887. doi: 10.1016/j.trechm.2020.08.003

Figure 1.

Figure 1.

Intramolecular [2,3]-Stevens rearrangements of aziridinium ylides. (A) Clark’s attempted indolizidine synthesis from the [2,3]-rearrangement of spirocyclic ylide intermediate 3. (B) Rowlands’ Cu-catalyzed ring expansion attempt of aziridine invertomers 4a and 4b.