Letters in Organic Chemistry - Volume 12, Issue 4, 2015

In this paper, some benzimidazole derivatives containing salicyl, oxadiazole, thiosemicarbazide and 1, 2, 4-triazole moieties have been synthesized and screened their antioxidant activities screened. Antioxidant activities of the synthesized compounds were tested with DPPH and ABTS•+ radical cation decolorization assays. Compounds 4b, 6a, 6b, 7a and 7b showed very good scavenging activity.

The aromaticity index D ={[π1+∑2n (π1 – π 2 )]0 / [π1+∑2n (π1 – π 2 )]}× a , where π1 ... πn are the energy of the occupied molecular orbitals and a is the number of the cycles in the molecule, has been tested in the case of substituted hexaatomic aromatic compounds. The correlation between D and ASE in the case of substituted benzene derivatives is reported. Furthermore, the correlations between D and ISE in the case of su Read More

A convergent and facile synthesis of thiourea-based novel 1-(3-nitrophenyl)-3-(7- (substituted phenylamino/piperazino)quinolin-4-yl)thiourea derivatives is presented by approaching copper catalyzed Ullmann reaction. Pliable route was adopted to achieve amination on bioactive 4,7- dichloroquinoline analogous for the first time in which substituted amine/piperazine condensed with C-7 position of quinoline core. Prese Read More

The synthesis and cytotoxicity evaluation of fourteen new chalcones containing 5-fluorouracil were introduced in which nine chalcones as Mannich bases 8a-i were synthesized from 2'-hydroxyacetophenone (1) in three steps including chloromethylation, N-alkylation and Claisen-Schmidt reactions. Other chalcones 14a-e were obtained from Click reaction between 1,3-dipropargyl-5-fluorouracil and azide derivatives of 2',4' Read More

Although viewed as promising drug candidates, few efforts have been addressed towards the structural chemistry of 2-hydrazonothiazolidin-4-ones. Therefore, 2-[(3-phenylsulfanylpropylidene)- hydrazono]thiazolidin-4-one (ATZ3) was synthesized and its crystal and molecular structure was studied by NMR and X-ray single crystal diffraction. The 1H NMR spectral data indicated that the hydrazone group assumes the Econfigu Read More

Sodium benzenesulfinates, as a new organo catalyst, can be used to synthesize tetrahydro- 4H-chromene derivatives by three component reaction of cyclic β-dicarbonyl compounds, malononitrile, and aromatic aldehydes, in H2O/EtOH, under ultrasound irradiation at room temperature. Inexpensiveness, stability and the potential of being easily obtained can be noted as preponderance of these catalysts. Furthermore, hig Read More

An improved method for the synthesis of 3-quinuclidinone hydrochloride 4 from piperidine-4-carboxylic acid 1 has been described. Reaction of piperidine-4-carboxylic acid 1 with thionyl chloride and ethanol gave ethyl piperidine 4-carboxylate 2. It was further condensed with methyl chloroacetate in presence of sodium carbonate to give ethyl 1-(2-methoxy-2- oxoethyl)piperidine-4-carboxylate 3. One pot Dieckmann r Read More

A practical phosphotungstic acid-catalyzed aromatic transesterification reaction for the preparation of aryl benzoates has been developed. The transesterification method avoids the oxidation of the corresponding phenols to quinone compounds with easy operations, environmentally benign conditions and high yields of the products. It is noteworthy that in this process phosphotungstic acid can be reused and recycled.

In search of novel potent bioactive compounds, a series of novel maleimide-based thiourea derivatives containing terpinene structure were designed and synthesized. Their structures were characterized by IR, MS, NMR, UV-vis and elemental analysis. The preliminary bioassay showed that the target compounds exhibited a certain fungicidal activity, in which compound 2-methoxyphenyl-Naminoethyl- terpinene-maleimi Read More

A green, efficient and operationally simple method for three-component synthesis of 1,2,3- trisubstituted pyrrole derivatives via an iodine-catalyzed tandem reaction has been developed, and a series of 1,2,3-trisubstituted pyrrole derivatives were synthesized from simple starting materials under neutral conditions, with good to excellent yields in short time. This method showcased the potential of great value as a mild, rapid, and g Read More