Diels-Alder Reaction of 2-Ethenyl-1,3,3-trimethylcyclohexene with 4H-Chromen-4-ones: A Convergent Approach to ABCD Tetracyclic Core of Marine Diterpenoids Related to Puupehenone and Kampanols

[摘要]：A rapid assembly of the tetracyclic core of marine diterpenoids related to puupehenone and kampanols by Diels-Alder reaction of 2-ethenyl-1,3,3-trimethylcyclohexene with 4H-chromen-4-one (=4H-1-benzopyran-4-one) dienophiles is described.

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