This account describes our studies on the total synthesis of several natural terpenoids based on our modified biosynthetic hypothesis. Compared to the originally proposed biosynthetic hypothesis, the modified ones proved to be more practicable for the formation of hispidanin A, a dimeric diterpenoid, and sarcandrolide J and shizukaol D, two dimeric sesquiterpenoids, from a viewpoint of chemical reactivity. Moreover, a cascade reaction involving intermolecular and intramolecular cycloaddition was facilitated to expeditiously accumulate molecular complexity in the total synthesis of bolivianine, a sesterterpenoid, on the basis of a modified biohypothesis. 1 Introduction 2 Total Synthesis of Hispidanin A 3 Total Syntheses of Bolivianine and Isobolivianine 4 Total Syntheses of Sarcandrolide J and Shizukaol D 5 Conclusion

中文翻译：

---

天然萜类化合物的全合成：受生物假设的启发但不受限制

该帐户描述了我们基于我们修改后的生物合成假设对几种天然萜类化合物进行全合成的研究。与最初提出的生物合成假说相比，从化学反应性的角度来看，修改后的假说被证明更适用于形成二聚二萜类化合物 hispidanin A 和两种二聚倍半萜类化合物 sarcandrolide J 和静香醇 D。此外，在改进的生物假说的基础上，促进了涉及分子间和分子内环加成的级联反应，以在玻利维亚氨酸（一种二萜类化合物）的全合成中迅速积累分子复杂性。1 引言 2 Hispidanin A 的全合成 3 Bolivianine 和 Isobolivianine 的全合成 4 Sarcandrolide J 和 Shizukaol D 的全合成 5 结论