An elegant synthesis of linear acetylchromenes, viz eupatoriochromene, methyleupatoriochromene (encecalin), evodionol and methlevodionol, has been achieved by blocking the reactive position position C-3 of the appropriate ketones with an iodo group, prenylation with 3-chloro-3-methylbut-1-yne an...

The synthesis of 6-nitro-4-sulfanyl-1H-indoles from 2,4,6-trinitrotoluene (TNT) is described. The first step is the nucleophilic substitution of an ortho-nitro group with a thiol to give the corresponding sulfide. The latter were transformed into the corresponding enamines upon treatment with di...

The vapour phase reaction of ammonia and hexafluoroacetylacetone leads to the formation of the new β-keto-amine C5H3F6NO. Crystals of the compound are monoclinic, space group P21/n, a = 10.01(2), b = 19.33(3), c = 8.40(1) Å, β = 82.27(6)°; final R = 0.044.

The primary etiology of Parkinson’s disease (PD) remains unclear, but likely reflects a combination of genetic and environmental factors. Exposure to some pesticides, including ziram (zinc dimethyldithiocarbamate), is a relevant risk factor for PD. Like some other environmental neurotoxicants, ...

Aspergillus flavus is a ubiquitous saprophyte and is capable of producing many secondary metabolites including the carcinogenic aflatoxins. The A. flavus population that produces small sclerotia (S strain) has been implicated as the culprit for persistent aflatoxin contamination in field crops. ...

A high-throughput method for determining the octanol/water partition coefficient (Po/w) of a large variety of compounds exhibiting a wide range in hydrophobicity was established. The method combines a simple shake-flask method with a novel two-phase solvent system comprising an acetonitrile–pho...

The benzyl 4-hydroxybenzoate single crystal has been grown by vertical Bridgman technique. The grown crystal was confirmed by single crystal X-ray diffraction studies. The presence of functional groups in the crystal was confirmed by Fourier transform infrared (FTIR) spectral studies. The therma...

In this work, the modification of the surface of polypropylene (PP) with poly(3-hexylthiophene) (P3HT) was carried out using a simple two-step grafting reaction. In the first step, 3-(4-ethenylphenyl)thiophene, synthesized by Suzuki-Miyaura cross coupling, was grafted onto the PP surface using t...

A variety of N-methyl-3-(2-ethenylphenyl)-1(2H)-isoquinolones 1a–e have been prepared by base-induced intramolecular cyclization of N-(2-ethenylbenzoyl)-N,2-dimethylbenzamide derivatives 2a–e. The concomitant formation of the fused dihydro benzo[c]phenanthridinones 7a–e was also observed duri...

3,4-Dihydropyrimidin-2(1H)-one, 3,4-dihydropyrimidin-2(1H)-thione, and 3,4-dihydropyrimidin-2(1H)-imine derivatives were synthesized by modified Biginelli cyclocondensation reaction catalyzed by triphenylphosphine as Lewis base. The structures of the synthesized compounds have been elucidated by...

3-Cyano-4,6-dimethyl-2-pyridone and 3-cyano-4-methyl-6-phenyl-2-pyridone were synthesized effectively by the reaction of readily available 1,3-diketone and malononitrile directly and in good yield. Upon photoexcitation, 3-cyano-4-methyl-6-phenyl-2-pyridone in ethanol shows strong blue emission. ...

Synthetic strategy of functional group transformation has been utilized to modify the acidic hydroxyl (−OH) of a series of pyridone based heterocyclic dyes into basic secondary amine (−NHCH2CH2CH2OCH3), so as to improve the color instability of hydrazone dyes under the basic condition. Namely, f...

Novel highly emissive 2-pyridone-based compounds 3a,b and 4a–d were synthesized by a convenient one-pot method from 4-(dialkylamino)acetophenones (1a,b) and cyanoketene dithioacetal (2a) or sulfonyl ketene dithioacetals (2b,c), and their fluorescence properties were investigated. A simple struc...

Linear free energy relationships (LFER) were applied to the 1H and 13C NMR chemical shifts in 3-cyano-4-(substituted phenyl)-6-phenyl-2(1H)pyridones. The correlation analysis for the substituent-induced chemical shifts (SCS) with inductive (σI), and various resonance (σR) parameters were carri...

ABSTRACTMethionine is considered one of the most important essential AA for milk protein synthesis in dairy cows. Supplementation of unprotected, free Met is nearly 100% degraded by ruminal microorganisms, which complicates supplementation. 2-Hydroxy-4-methylthio-butanoic acid (HMTBa) can be con...

Phosphodiesterases (PDEs) have been studied in a variety of tumours; data have suggested that the levels of PDE activities are elevated and, therefore, the ratios of cGMP to cAMP are affected. In addition, PDE inhibitors are potential targets for tumour cell growth inhibition and induction of ap...

Diiron model complexes (μ-pdt)Fe2(CO)5L with L = pyridine ligands, e.g. py (A), etpy (B), btpy (C), were synthesized as active site analogues of [FeFe] hydrogenase, and characterized by X-ray crystallography and electrochemistry. Pyridine-N ligation was found to be able to tune the redox proper...

The synthesis and preliminary pharmacological profile of a new series of muscarinic antagonists, derived from previously studied 2,2-diphenyl-2-ethylthio-acetic acid esters, are reported. The parent molecules were decorated with linkers of different length, carrying an amino group to catch a put...

2-HPTP, a novel thiazolo [4, 5-b] pyridine-based Zn2+ selective fluorescent probe has been synthesized and investigated. This probe exhibited a high selectivity towards Zn2+ over other biologically essential cations such as Na+, K+, Ca2+, or Mg2+. 2-HPTP formed a 1:1 complex with Zn2+ and showed...

Treatment of 4,5-dichlorophthalonitrile with 2-(dimethylamino)ethanethiol hydrochloride and K2CO3 afforded 4,5-bis[2-(dimethylamino)ethylthio]phthalonitrile or a heterocycle-fused phthalonitrile depending on the reaction temperature. The latter has been spectroscopically and structurally charact...