Neoproterozoic cap dolomites are unusual and distinctive marker units that occur after large Cryogenian glaciations. Several thin dolomite units that have features resembling cap dolomites occur within the Cryogenian-Ediacaran succession of the Adelaide Geosyncline. While each of these dolomite ...

The first synthesis of (3S,8S)-(-)-4,6-decadiyne-1,3,8-triol, isolated from a toxic mushroom Gymnopilus spectabilis, has been achieved by employing the chiral 3-hydroxyalkyne formation reaction as the key step.

We describe a direct method for the synthesis of 3-hydroxy-pent-4-ynoic acids by the nucleophilic addition of bis-(TMS) ketene acetals to alkynones promoted by BF3·Et2O. A systematic study involving electron withdrawing and electron donor groups (R1=NO2, CF3, Br, Cl, H, Me, OMe) in the propargy...

In the present work, we have efficiently synthesized the pyrrole-isoxazoline derivatives (4a-d) by cyclization of substituted 4-chalconylpyrrole (3a-d) with hydroxylamine hydrochloride. The reactivity of substituted 4-chalconylpyrrole (3a-d), towards nucleophiles hydroxylamine hydrochloride was ...

The reactivity of stereochemically defined 3-aryl-2-chloro-2-imidoylaziridines, an unexplored class of substituted aziridines, was investigated under various reaction conditions. 2-Chloro-2-imidoylaziridines underwent a novel thermal rearrangement by reflux in acetonitrile via C–C bond cleavage...

The synthesis of new derivatives of pyrrole substituted sulfonamide groups is described. The in vitro anticancer activity of these pyrroles was evaluated against MCF7, MOLT-4 and HL-60 cells using MTT assay. The target compounds showed inhibitory activity against tested cell lines. Among the com...

Highly functionalized pyrroles with appropriate regiochemical functionality represent an important class of marine natural products and potential drug candidates. We describe herein a detailed study of the reaction of α-aminoacid esters with vinylogous amides and also β-halovinylaldehydes for ...

In an effort to discover novel inhibitors of M. tuberculosis Caseinolytic proteases (ClpP1P2), a combination strategy of virtual high-throughput screening and in vitro assay was employed and a new pyrrole compound, 1-(2-chloro-6-fluorobenzyl)-2, 5-dimethyl-4-((phenethylamino)methyl)-1H-pyrrole-3...

Quaternary ammonium perrhenates were applied as catalyst to promote the hydrolysis of cellulose in 1-allyl-3-methylimidazolium chloride ([Amim]Cl). The quaternary ammonium perrhenates displayed good catalytic performance for cellulose hydrolysis. Water was also proven to be effective to promote ...

Allylic rearrangement and/or dehydration reaction of allylic alcohols proceeds smoothly by the use of catalytic amounts of tetrabutylammonium perrhenate and p-toluenesulfonic acid hydrate. Treatment of propargylic alcohols with the catalysts at room temperature affords the rearranged products, α...

Perfluoro-1-ethylindan heated with excess of SiO2 in an SbF5 medium at 75 °C and then treated with water, gives 4-carboxy-perfluoro-3-methylisochromen-1-one. Perfluoro-3-ethylindan-1-one is converted, under the action of SbF5 at 70 °C, to perfluoro-2-(but-2-en-2-yl)benzoic acid as a mixture of...

t-3-Ethyl-r-2,c-6-bis(4-methoxyphenyl)piperidin-4-one (1) and its N-phenylcarbamoyl, N-acetyl and N-chloroacetyl derivatives 2–4, respectively have been synthesized and characterized using IR, 1H, 13C, DEPT-135 & 2D NMR and mass spectral studies. The NMR spectral data indicate that the N-acyl-r...

Non linear optical material of t-3-ethyl-r-2,c-6-bis(4-methoxyphenyl)-1-nitrosopiperidin-4-one (NPM3EPO) is grown by slow evaporation technique by using methanol as solvent. The absorption spectrum range of grown crystals is identified by UV-Vis spectroscopy. The presence of functional groups an...

The disinfection-induced and photo-induced degradation of the UV filter 3-methylbutyl-(2E)-3-(4-methoxyphenyl)-acrylate (IMC) is investigated. High performance liquid chromatography was used to follow the degradation reactions, determine kinetic features and also the influence of external variab...

Liquid-liquid equilibria (LLE) phase diagrams have been determined for the systems: 2-ethoxy-benzenamine + octane, or +decane, or +dodecane, or +tetradecane and for 4-ethoxy-benzenamine + heptane, or +octane. The experimental method used is based on the observation, by mean of a laser scattering...

Diacylimidazolium ions yield adducts with aromatic compounds. Thus the N,N'-diacetylimidazolium ion and indole gives 1,3-diacetyl-2-(3-indolyl)-4-imidazoline. Less reactive substrates such as thiophene, anisole and 1,3-dimethylbenzene fail to react with this reagent but do form adducts (e.g...

In the present study, we characterized OXSI-2 [3-(1-Methyl-1H-indol-3-yl-methylene)-2-oxo-2, 3-dihydro-1H-indole-5-sulfonamide], a putative inhibitor of Syk, and determined its specificity and selectivity in platelets. We found that OXSI-2 completely abolished convulxin-induced platelet function...

BackgroundInduction of the death pathway resulting from the specific interaction of the PP2A1 phosphatase with adenoviral E4orf4 protein is a promising approach for cancer therapy. With the aim of deregulating tumor pathways, and mimicking E4orf4 anti-cancer signal, we have previously proposed t...

Three undescribed natural products, the anthranilic acid derivatives laccanthrilic acids A, B, and C, as well as the known (3S)-1,2,3,4-tetrahydro-3-β-carboline-3-carboxylic acid were isolated from fruiting bodies of Laccaria laccata. The structures were established by 1D and 2D NMR spectroscop...

1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) produces a parkinsonian state in monkeys and humans and a marked 3,4-dihydroxyphenylethylamine (dopamine) depletion in mouse striatum. In this study, we found that pretreatment with 3-(10,11,-dihydro-5H-dibenzo-[a,d]-cycloheptan-5-ylidene)-1-et...