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AbstractHistone deacetylase 6 (HDAC6) was a potential target for Alzheimer’s disease (AD). In this study, a series of novel oxyevodiamine-based HDAC6 inhibitors with a variety of linker moieties were designed, synthesized and evaluated. Compound 12 with a benzyl linker was identified as a high potent and selective HDAC6 inhibitor. It inhibited HDAC6 with an IC50 value of 6.2 nM and was more than 200 fold selectivity over HDAC1. It also had lower cytotoxicity and higher anti-H2O2 activity in vitro comparing with other derivatives. Compound 12 might be a good lead as novel HDAC6 inhibitor for the treatment of AD. [ABSTRACT FROM AUTHOR]

AbstractThree new flavonoids including two isoflavanones sophortones A and B (1 and 2), and one chalcone sophortone C (3) were isolated from the roots of Sophora tonkinensis. Their structures were established by UV, IR, HRESIMS, and NMR data. The absolute configurations of 1 and 2 were determined by electronic circular dichroism (ECD) calculations. [ABSTRACT FROM AUTHOR]

Three new monocyclic monoterpenoid containing β-D-apiofuranosyl-(1→2)-O-β-D-glucopyranosyl moieties, together with three other known monocyclic monoterpenoid O-glycosides, were obtained from the roots of Glycyrrhiza uralensis for the first time. Their structures were determined by UV, IR, HRESIMS, and 1D and 2D NMR data. [ABSTRACT FROM AUTHOR]

One new epoxydon ester (1) and a new benzolactone derivative (2), along with four known compounds (3−6), were isolated from the insect-associated fungus Phoma sp. Their structures were confirmed by extensive MS and NMR spectroscopic analysis and their absolute configurations were determined by a combination of modified Mosher method and Mo2(OCOCH3)4-induced electronic circular dichroism (ECD) experiments. Compounds 1 and 5 were revealed to have potent antioxidant activities, which were approximate to the potency of the positive control trolox. In addition, 1 also exhibited moderate cytotoxic effect against human MGC-803 tumor cell line. [ABSTRACT FROM AUTHOR]

Two new lignans, wikstronoside B (1) and forsysesquinorlignan (2), were isolated from the fruits of Forsythia suspensa, along with two known sesquineolignans, hedyotol A and hedyotol C (3 and 4). The structures of new compounds were established via extensive spectroscopy techniques, including UV, IR, HRESIMS, NMR, and ECD. Compounds 3 and 4 were isolated from this plant for the first time. Their anti-inflammatory effects were evaluated via a detection model with LPS-induced murine macrophage RAW264.7 cells, and compound 3 showed a moderate activity. [ABSTRACT FROM AUTHOR]

Two new naturally occurring products named salviamine G (1) and 4-methyl-9-(ethoxycarbonyl)-8-naphthoic acid (2) were isolated from the rhizomes of Salvia miltiorrhiza. Their structures were elucidated using spectroscopic data (UV, IR, HRESIMS, 1D and 2D NMR). Compounds 1 and 2 were screened for their inhibitory activity against HSV-1 and influenza A (H3N2) using acyclovir (ACV, IC50 = 0.67 μM) and oseltamivir (IC50 = 2.01 μM) as a positive control. Compound 1 exhibited moderate inhibitory activity against HSV-1 and influenza A (H3N2) with IC50 values of 11.11 and 8.62 μM, respectively. [ABSTRACT FROM AUTHOR]

Two new isobenzofuranone derivatives, polyphthaliside A (1) and polyphthaliside B (2), and a new isocoumarin derivative, polyisocoumarin (3), were isolated from Polygonum cuspidatum. Their structures were elucidated by detailed spectroscopic analysis and chemical methods. The cytotoxicity activity and PTP1B inhibitory activity of compounds 1–3 were estimated and none of them exhibited activities at a concentration of 10 μM. [ABSTRACT FROM AUTHOR]

An ongoing phytochemical investigation of the rhizomes ofAtractylodes lancearesulted in the isolation of four new C10-type polyacetylene glycosides (1−4). Their structures were elucidated on the basis of extensive spectroscopic data (UV, IR, 1D and 2D NMR, and HRESIMS). The absolute configurations of compounds2−4were determined by comparing the specific rotations of their aglycones. Notably, compounds2and3exhibited significant hepatoprotective activities against APAP-induced HepG2 cell injury at a concentration of 10 μM. Compounds2and3showed weak anti-inflammatory effects on LPS-induced NO production in microglia BV2 cells at a concentration of 10 μM. [ABSTRACT FROM PUBLISHER]

Four new neolignan glucosides named (7S, 8R)-4,7,9,9′-tetrahydroxy-3,3′-dimethoxy-8-O-4′-neolignan-9′-O-β-d-apiofuranosyl-(1 → 6)-O-β-d-glucopyranoside (1), (8R)-4,9,9′-trihydroxy-3,3′-dimethoxy-7-oxo-8-O-4′-neolignan-4-O-β-d-glucopyranoside (2), (7R, 8S)-dihydrodehydrodiconiferyl alcohol-7′-oxo-4-O-β-d-glucopyranoside (3), and (7′S, 8′R, 8S)-4,4′,9′-trihydroxy-3,3′-dimethoxy-7′,9-epoxylignan-7-oxo-4-O-β-d-glucopyranoside (4) were isolated from the fruits ofArctium lappaL. Their structures and absolute configurations were elucidated on the basis of comprehensive spectroscopic analyses (UV, IR, HR-ESI-MS, 1D and 2D NMR, CD), as well as by comparison with known analogues in the literature. [ABSTRACT FROM PUBLISHER]

Two new glycoside compounds, named saffloquinoside C (1) and (-)-4-hydroxybenzoic acid-4-O-[6′-O-(2″-methylbutyryl)-β-D-glucopyranoside] (2), were isolated from the florets of Carthamus tinctorius. Their structures were elucidated by detailed spectroscopic means including UV, IR, HR-ESI-MS, 1D and 2D NMR, and CD data. Compound 1 was a rare quinochalcone glycoside with six five-membered dioxaspirocycle. [ABSTRACT FROM AUTHOR]

A new nortriterpenoid saponin, 3β,17β-dihydroxy-28-nor-12-oleanen-16-one 3-O-β-d-galactopyranosyl (1 → 2)-{α-l-arabinopyranosyl (1 → 3)-[α-l-arabinofuranosyl (1 → 4)-β-d-glucuronopyranoside]} (1), along with two pairs of known isomers, was isolated from the roots of Symplocos caudata Wall. Their structures were elucidated by spectroscopic and chemical methods. [ABSTRACT FROM AUTHOR]

Two new flavonoid glycosides, hypolaetin 4'-methyl ether 8-O-β-d-glucuronide 2''-sulfate (1) and hypolaetin 4'-methyl ether 3'-O-β-d-glucoside (2), and a new phenylpropanoid glucose ester, 1,6-diferuloyl glucose (3), were isolated from the leaves of Sterculia foetida L. Their structures were elucidated by spectroscopic analysis and chemical evidence. [ABSTRACT FROM AUTHOR]

Two new spermidine compounds, namely safflospermidine A (1) and safflospermidine B (2), together with two known compounds, N1,N5,N10-(Z)-tri-p-coumaroylspermidine (3) and N1,N5,N10-(E)-tri-p-coumaroylspermidine (4), were isolated from the florets of Carthamus tinctorius L. Their structures were elucidated by spectroscopic means. [ABSTRACT FROM AUTHOR]

AbstractTwo new cucurbitane-type triterpenoid saponins, 2,20β,22β-trihydroxy-16α,23(R)-epoxycucurbita-1,5,24-triene-3,11-dione 2-O-β-D-glucopyranoside (1), 2,20β,22α-trihydroxy-16α,23(S)-epoxycucurbita-1,5,11,24-tetraene-3-one 2-O-β-D-glucopyranoside (2) were isolated from the fruit of Citrullus colocynthis (L.) Schrad. Their structures were elucidated by mass spectrometry, IR, 1D, and 2D NMR spectroscopy, etc. Besides, both of the compounds showed significant hepatoprotective activities at 10 μM against paracetamol-induced HepG2 cell damage. [ABSTRACT FROM AUTHOR]