(+)-Arisugacin F and G are synthesized from commercially available oleanolic acid in 9 and 10 steps, respectively. This strategy features a AgOTf/Pd(PPh₃)₄-mediated cis/trans olefin isomerization and a highly convergent formal oxa-[3 + 3] cycloaddition between key α, β-unsaturated aldehyde and pyrone, which lays the foundation for efficient and concise synthesis of other natural products with similar terpenoid scaffolds.

中文翻译：

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（+）-芦荟素F，G的总合成

（+）-Arisugacin F和G分别由市售的齐墩果酸分9步和10步合成。该策略具有AgOTf / Pd（PPh ₃）₄介导的顺式/反式烯烃异构化和关键α，β-不饱和醛与吡喃酮之间高度收敛的形式oxa- [3 + 3]环加成的特点，这为高效和精简合成具有类似萜类骨架的其他天然产物。