期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 75, 期 21, 页码 7146-7158出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo101242e
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Synthetic efforts toward the convergent construction of the tetracyclic triterpenoids cucurbitacins B and D are described. The results of a Diels-Alder study examining the effects of steric and electronic variations of 2-methyl-2-cyclohexenone on the endo/exo-diastereoselectivity of the reaction are presented. The diastereomer of the core of the cucurbitacins, epimeric at C8, C9, and C10, 51, was synthesized via a highly regio- and stereoselective Diels-Alder reaction of the diene 4 and the novel dienophile 50.
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