环戊烷基取代茚基稀土胺化合物(1-C_5H_9C_9H_6)_2YN(SiMe_3)_2的合成与表征

无水YCl3与 1-环戊烷基取代茚基锂以 1/2的摩尔比在四氢呋喃 (THF)中反应合成了二 ( 1-环戊烷基取代茚基 )钇的氯化物 ( 1-C5H9C9H6 ) 2 Y( μ -Cl) 2 Li(THF) 2 ,产物经过了元素分析、红外光谱表征。环戊烷基取代茚基钇的氯化物 ( 1-C5H9C9H6 ) 2 Y( μ -Cl) 2 Li(THF) 2 与碱金属胺盐的复分解反应 ,合成了新的取代茚基稀土胺化物 ( 1-C5H9C9H6 ) 2 YN(SiMe3) 2

八角属植物中的C_6-C_3类化合物及其药理活性研究进展

八角属植物中富含C6-C3类化合物,结构类型多样,有苯丙素类、木质素类和独特新颖的植物醌类,并具有较好的抗炎、神经营养、抗癌和抗氧化等活性,药用开发前景广阔。本文根据国内外文献报道,对该属植物C6-C3类化合物及其药理活性研究进展进行综述,为进一步研究开发该属植物提供参考。

Three unprecedented biphenyl derivatives bearing C6-C3 carbon skeleton from the bark of Magnolia officinalis var.biloba

(+)-Magoilgomer A[(±)-1]and magoilgomer B(2)were identified from the bark of Magnolia officinalis var.biloba.(+)-1 and(-)-1 were a pair of novel biphenyl derivatives featuring three C6-C3 subunits.2 was an unprecedented adduct containing magnolol and honokiol.These three oligomers possessed new parallel mode which should be biosynthesized from the coupling of three or four C6-C3 subunits.The structures of(±)-1 and 2 were elucidated based on the spectroscopic data analyses and electronic circular dichroism(ECD)calculations.2 exhibited neuroprotective effects of oxygen glucose deprivation-induced SK-N-SH cell injury.

Trifluoromethylative homo-coupling of carbonyl compounds

Carbonyl compounds are abundant in nature and represent a substantial portion of biomass resources.Despite significant recent progress in homo-coupling of carbonyl compounds,achieving their deoxyfunctionalization homo-coupling remains a highly intricate challenge.Herein,we report an entirely novel reaction paradigm:the trifluoromethylative homo-coupling of carbonyl compounds via hydrazones,which enables the formation of three C(sp^(3))-C(sp^(3))bonds in a single step.This method provides a new pathway for synthesizing trifluoromethylative coupling product which has unique applications in both fields of medical and material sciences.Mechanistic investigations have unveiled that the formation of a trifluoromethyl-substituted benzyl radical plays a pivotal role as a key intermediate in this reaction.

白花丹中酚类成分及其抗氧化活性研究

目的研究白花丹Plumbago zeylanica中的酚类成分及其抗氧化活性。方法采用硅胶柱色谱、半制备高效液相色谱及高效液相色谱进行系统分离,利用ESI-MS、1H-NMR、13C-NMR等波谱技术鉴定化合物结构;运用ABTS自由基清除法对分离得到的化合物进行抗氧化活性评价。结果从白花丹药材中分离得到了12个化合物,分别鉴定为(±)-5,5′-dimethoxyl ariciresionl 4′-O-β-D-glucopyranoside(1)、络石苷(2)、槲皮素-3-O-β-D-半乳糖苷(3)、槲皮素-3-O-β-D-葡萄糖苷(4)、槲皮素(5)、槲皮素-3-O-α-L-鼠李糖苷(6)、山柰酚-3-O-α-L-鼠李糖苷(7)、芹菜素-6-C-β-D-葡萄糖苷(8)、木犀草素-6-C-β-葡萄糖苷(9)、polybotrin(10)、3-O-(β-D-glucopyranosyl)-1-(3′,5′-dimethoxy-4′-hydroxyphenyl)-1-propanone(11)、(2E,4E,1′R,3′S,5′R,8′S)-二氢红花菜豆酸-3′-O-β-D-吡喃葡萄糖苷(12)。ABTS自由基清除实验表明,化合物3~9具有显著的总抗氧化能力。结论12个酚类化合物均为首次从该药材中分离得到,其中黄酮类成分显示了较为显著的总抗氧化能力。