The authors retract this Letter upon discovering structural misassignments in which compounds identified as unsaturated piperazines (6aa–6ai, 6bb–6fb) are actually [3.9]-bicyclic aziridines (Figure 1).
Figure 1.
Discovered structural misassignment of unsaturated piperazines.
The authors are in the process of submitting a new article with the revised structural assignments and additional insights.
The original letter was published on April 22, 2020, and retracted on February 11, 2022.
Footnotes
Organic Letters 2020, 22 (9), 3637–3641, DOI: 10.1021/acs.orglett.0c01124