Adamantyl and homoadamantyl derivatives from Garcinia multiflora fruits

Garciyunnanones A-R: Caged polycyclic polyprenylated acylphloroglucinols decorated with a lavandulyl substituent from Garcinia yunnanensis

Garciyunnanones A-R (1-18), eighteen undescribed caged polycyclic polyprenylated acylphloroglucinols, two undescribed biogenetic congeners (19-20), and nineteen known analogues (21-39), were isolated from the stem barks of Garcinia yunnanensis Hu. All of these isolates are decorated with a C-5 lavandulyl substituent. Their structures and absolute configurations were confirmed by HRESIMS, 1D & 2D NMR spectroscopic analysis, quantum chemical calculations of electronic circular dichroism data, and single-crystal X-ray diffraction analysis. The X-ray crystallographic data of ten isolated caged compounds ascertained the absolute configuration of C-23 in the lavandulyl as S. The cytotoxicity on three cancer cell lines and the anti-nonalcoholic steatohepatitis activity of the isolates were tested. In a free fatty acid-induced L02 cell model, compounds 33 and 39 decreased intracellular lipid accumulation significantly.

Nascent pharmacological advancement in adamantane derivatives

The adamantane moiety has attracted significant attention since its discovery in 1933 due to its remarkable structural, chemical, and medicinal properties. This molecule has a notable impact in the therapeutic field because of its "add-on" lipophilicity to any pharmacophoric moieties. As in the case of molecular hybridization, in which one pharmacophore is attached to another one(s) with a probability of increasing the biological activity, adding an adamantane unit improves the absorption distribution, metabolism and excretion properties of the resultant hybrid molecule. This review summarizes various reports highlighting the biological activities of adamantane-based synthetic compounds and their structure-activity relationship study. The information presented in this review may open up possible dimensions for adamantane-based drug development and discovery in the pharmaceutical industry after proper structural modifications.

Polyprenylated Acylphloroglucinols With Different Carbon Skeletons From the Fruits of Garcinia multiflora

Eleven new polycyclic polyprenylated acylphloroglucinols (PPAPs, 1-11) and three new monocyclic polyprenylated acylphloroglucinols (MPAPs, 12-14), together with ten known analogues were isolated from the fruits of Garcinia multiflora. These PPAPs belong to three types including the bicyclic polyprenylated acylphloroglucinols (BPAPs), the caged PPAPs, and the complicated PPAPs. Their structures and absolute configurations were determined through HRESIMS, NMR spectroscopy data, electronic circular dichroism (ECD) calculations, and gauge-independent atomic orbital (GIAO) NMR calculations with DP4+ analyses. Moreover, compounds 2 and 7 exhibited moderate cytotoxicity against three human cancer lines (MCF-7, T98, and HepG2) with IC50 values ranging from 9.81 ± 1.56 to 17.00 ± 2.75 μM.

Anti-adipogenicadamantane type polycyclic polyprenylated acylphloroglucinols from Hypericum subsessile

Hypersubones D-H (1-5), five new polycyclic polyprenylated acylphloroglucinols (PPAPs) type metabolites with intriguing adamantane and homo-adamantane skeletons, were characterized from aerial parts of Hypericum subsessile. Compounds 1-2 were elucidated to share an adamantane core with 28,29-expoxide moiety, while 3-5 were homo-adamantane type PPAPs sharing a1,2-dioxepane ring system. Their structures were determined on the basis of comprehensive NMR and MS spectroscopic data.The anti-adipogenesis activities of these isolates were evaluated through employing 3T3-L1 cells as an in vitro system using oil red O staining, and compounds 1, 2 and 5 were able to significant inhibit the adipocyte differentiation, which implied that these compounds possessed anti-adipogenic activity.

Pharmacological profile of natural and synthetic compounds with rigid adamantane-based scaffolds as potential agents for the treatment of neurodegenerative diseases

This review is dedicated to the comparative analysis of structure-activity relationships for more than 75 natural and synthetic derivatives of adamantane. Some of these compounds, such as amantadine and memantine, are currently used to treat dementia, Alzheimer's and Parkinson's diseases and other neurodegenerative diseases. The data presented show that the pharmacological potential of 1-fluoro- and 1-phosphonic acid adamantane derivatives against Alzheimer's and Parkinson's diseases and other neurodegenerative diseases exceeds those of well-known amantadine and memantine. The information presented in this review highlights the promising directions of studies for biochemists, pharmacologists, medicinal chemists, physiologists, and neurologists, as well as to the pharmaceutical industry.

Anti-inflammatory and antiproliferative prenylated sulphur-containing amides from the leaves of Glycosmis pentaphylla

Glycosmis pentaphylla (Retz.) DC (Rutaceae) has been traditionally considered as anti-cancer and anti-inflammatory medicine. However, active compounds of sulphur-containing amides remain largely unknown. In the present work, eighteen previously undescribed sulphur-containing amides (1-18) and three known analogues (19-21) were isolated from the leaves of G. pentaphylla. Their structures were elucidated by NMR spectroscopy and mass spectrometry. All isolated prenylated sulphur-containing amides were evaluated for their anti-inflammatory properties together with antiproliferative activities in vivo. Prenylated sulphur-containing amides exhibited significant inhibitory effects against nitric oxide (NO) production stimulated by lipopolysaccharide in mouse macrophage RAW 264.7 cells with the IC₅₀ values ranging from 0.16 ± 0.10 to 16.74 ± 2.81 μM. Meanwhile, sulphur-containing amides also exhibited considerable antiproliferative activities against HepG2 cell line with IC₅₀ values ranging from 7.47 ± 0.91 to 16.23 ± 0.80 μM. These findings enrich and improve the research on the structural diversity and biological activity of sulphur-containing amides and provide phytochemical and pharmacological evidence for the further development and utilization of the leaves of G. pentaphylla in pharmaceutical industry.

Acylphloroglucinol Derivatives with a Tricyclo-[4.4.1.11,4] Dodecane Skeleton from Garcinia bracteata Fruits

Two novel polycyclic polyprenylated acylphloroglucinols (PPAPs), garcibractinones A (1) and B (2), as well as three known analogues doitunggarcinones A-B (3-4) and garcibracteatone (5) were isolated from Garcinia bracteata fruits. Their structures were elucidated by comprehensive spectroscopic methods and single crystal X-ray diffraction. Compounds 1 and 2 possess an unprecedented caged tricyclo-[4.4.1.1^1,4] dodecane skeleton, and their biosynthetic pathways are also proposed. Compounds 1-2 were tested for their inhibitory effects on lipopolysaccharide (LPS)-induced nitric oxide (NO) production in RAW 264.7 macrophages.

Four intricately caged polycyclic polyprenylated acylphloroglucinols from Garcinia multiflora fruits

Garmultinones A–C (1–3), three polycyclic polyprenylated acylphloroglucinols (PPAPs) with a unique caged tricyclo[3.3.1.1.^4,8]decane skeleton, and one PPAP garmultinone D (4) with the tricyclo[4.3.1.0^3,7]decane skeleton bearing the 2,2-dimethyl-3-isopropenylcyclopentyl ring were isolated from the fruits of Garcinia multiflora.