1H NMR Reassignment for Z/E-Benzomalvins B and Absolute Configuration of Benzomalvin C
作者:Rong Chao、Yan-Wei Wu、Ling Lu、Wei-Feng Xu、Chang-Yun Wang、Chang-Lun Shao
DOI:10.1007/s10600-021-03347-5
日期:2021.3
Benzomalvins B, C, and E (1, 2, and 3) were simultaneously obtained from the marine fungus Aspergillus sp. isolated from the soft coral Sinularia sp., collected from South China Sea. Their structures were elucidated on the basis of NMR spectroscopic data and by comprehensive comparison with those previously reported in the literature. The stability of the double bond of E-benzomalvin B (1) under different light conditions was investigated, and 1 was transformed to Z-benzomalvin B (1′) with UV 365 nm irradiation. In particular, the incorrect 1H NMR data of 1′ in the literature was reassigned for the first time. Moreover, the absolute configuration of benzomalvin C (2) was also reported for the first time by X-ray single crystal diffraction.
从中国南海软珊瑚中分离的海洋真菌曲霉中同时获得了苯并马来呋喃霉素 B、C 和 E(1、2 和 3)。根据核磁共振光谱数据并与之前文献报道的结构进行综合比较,阐明了它们的结构。研究了不同光照条件下 E-苯并吗啡乙(1)双键的稳定性,并在紫外 365 nm 照射下将 1 转化为 Z-苯并吗啡乙(1′)。其中,首次对文献中错误的 1′ 的 1H NMR 数据进行了重新分配。此外,还通过 X 射线单晶衍射首次报告了苯并吗啡 C(2)的绝对构型。