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.
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| http://dx.doi.org/10.1039/d2ob01246d | DOI Listing |
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