The ABCE tetracyclic ring system of daphnicyclidin A was prepared using an intramolecular (4 + 3) cycloaddition of an oxidopyridinium ion as the key step. This route consists of a 10-step synthesis with an overall yield of 20.2%. This result offers support for the use of this strategy for total synthesis of daphnicyclidin A.
J. Tu, M. M. Clark and M. Harmata, Org. Biomol. Chem., 2022, 20, 6547 DOI: 10.1039/D2OB01246D
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