Four new ergostane-type steroids from Lasiodiplodia pseudotheobromae
2020
Liang, Yu | Zhang, Mi | Yu, Muyuan | Wang, Jianping | Zhu, Hucheng | Chen, Chunmei | Zhang, Yonghui
Four new ergostane-type steroids (1–4) were isolated from the fungus of Lasiodiplodia pseudotheobromae. Their structures were elucidated based on spectroscopic methods and single crystal X-ray diffraction analysis. Compound 1, an unusual steroid, possesses a unique ring system with A-ring contracted and formed a new δ-lactone ring between C-3 and C-9. The absolute configurations of compound 1 was determined by ECD calculation while compound 2 was confirmed by single-crystal X-ray diffraction analysis.
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