Journal
ACS OMEGA
Volume 7, Issue 23, Pages 19080-19092Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.2c02116
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Funding
- Australian Government
- University of Western Australia
- University of Queensland
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The study attempted to synthesize the marine natural product alpkinidine using model chemistry, but faced challenges in certain reactions, preventing the direct synthesis of the target product.
Model chemistry involving the bisannulation of 2,3-dichloro-1,4-naphthoquinone with the ester enolate derived from ethyl o-nitrophenylacetic acid, which rapid assembled the ABCD ring system of a pentacyclic pyrroloacridine, has been applied to the attempted synthesis of the marine natural product alpkinidine. The reaction of ethyl o-nitrophenylacetic acid with 6,7-dichloro-2methylisoquinoline-1,5,8(2H)-trione, required to extend the model strategy to alpkinidine, was unfruitful, giving only complex mixtures. Efforts to direct the regiochemistry of the key Michael substitution step using 6-bromo-2-methylisoquinoline-1,5,8(2H)trione afforded an adduct sharing the complete carbon skeleton of alpkinidine, but this could not be elaborated to the natural product.
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