Piperhancins A and B, Two Pairs of Antineuroinflammatory Cycloneolignane Enantiomers from <i>Piper hancei</i>
作者:Fan Yang、Bao-Jun Su、Ya-Jie Hu、Jin-Long Liu、Hua Li、Ya-Qi Wang、Hai-Bing Liao、Dong Liang
DOI:10.1021/acs.joc.1c00240
日期:2021.4.2
pairs of biosynthetic related neolignanes, hancinone C (3) and piperhancin C (4), were isolated from the stems of Piper hancei. Compound 1 is an unprecedented 1′,2:1,2′-dicyclo-8,3′-neolignane. Their structures and absolute configurations were elucidated by spectroscopic analyses, X-ray diffraction, and electronic circular dichroism calculations. Among all of the isolates, compounds (+)-1, (−)-1, (+)-2
从胡椒茎秆的茎中分离出两对对映异构体对映体A和B(分别为1和2),以及两对对映体生物合成相关的新木脂素对映体汉香素C(3)和胡椒霉素C(4)。化合物1是史无前例的1',2:1,2'-二环-8,3'-新烷烃。通过光谱分析,X射线衍射和电子圆二色性计算,阐明了它们的结构和绝对构型。在所有分离物中,化合物(+)- 1,(-)- 1,(+)- 2,(-)- 2和(+)- 3可以显着抑制BV-2小胶质细胞中脂多糖(LPS)诱导的神经炎症分泌的一氧化氮的产生,IC 50值为1.1–26.3μM。此外,化合物(-)- 1可以降低BV-2小胶质细胞中LPS诱导的iNOS,IL-6和TNF-α的mRNA水平。