Heterocyclic

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Summary of Doctoral Thesis in Chemistry: Synthesis, structure, and properties of some imidazole-5-one, thiazolidine-2,4-dione or 1,3,4-oxadiazoline heterocycles

Goals of the study: Synthesis of new organic compounds (target) containing imidazole-5-one heterocycle; thiazolidine-2,4-dione heterocycle or 1,3,4-oxadiazoline heterocycle with different substituents in experimental conditions of Vietnam. Study on the properties, structures and biological activities of these compounds to contribute to the studies of both theory and application of heterocyclic compounds.

27p prisonbreak123 21-05-2021 25 4 Download

Fast and convenient synthesis of new symmetric pyrano[2,3-d:6,5-d']dipyrimidinones by an organocatalyzed annulation reaction

A fast and facile one-pot procedure for the preparation of symmetric 5-Aryloyl-1,9-dimethyl-5,9-dihydro-2H-pyrano[2,3-d:6,5-d']dipyrimidine-2,4,6,8(1H,3H,7H)-tetraone derivatives by two-component reaction of N-methylbarbituric acid and arylglyoxalmonohydrates catalyzed by DABCO in ethanol at 50 ºC is described.

14p tocectocec 25-05-2020 10 1 Download

Corrosion inhibition capacity of two heterocyclic oximes on copper in nitric acid: electrochemical, quantum chemical and surface morphological investigations

Two heterocyclic oximes (E)-N-hydroxy-1-(pyridin-2-yl)methanimine (Hp2ylm) and (E)-N-hydroxy-1-(pyridin-3-yl)methanimine (Hp3ylm) were synthesized from pyridine-2-carbaldehyde and pyridine-3-carbaldehyde, respectively.

12p tocectocec 25-05-2020 9 2 Download
5-[Substituted]-1, 3, 4-thiadiazol-2-amines: Synthesis, Spectral Characterization, and Evaluation of their DNA interactions

The presence of heterocyclic moiety in diverse compounds, strongly indicative of the desired effect on physiological activity, and it reflects on efforts to find useful synthetic drugs.

12p tocectocec 25-05-2020 18 2 Download
Green synthesis of 4-methoxybenzylidene thiazole derivatives using potassium carbonate as base under ultrasound irradiation

An environmentally benign aqueous protocol for the synthesis of novel 2-((5-(4-methoxybenzylidene)-4-oxo-4,5-dihydrothiazol-2-yl)amino)substituted acid by using potassium carbonate as a base has been achieved.

14p tocectocec 25-05-2020 10 0 Download
Synthesis and characterization of some derivatives of 1,3-Diisopropyl-4,5-dimethylimidazol-2-ylidene

N-Heterocyclic carbenes are widely used in organic reactions and coordination chemistry. In the present study, 2,3-dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (1) is reacted with diphenyl disulfide, methyl phenyl disulfide, and bis(methylsulfonyl)methane to yield target compounds 5, 6, and 7 respectively.

6p tocectocec 25-05-2020 7 0 Download
Interaction of two heterocyclic Schiff bases derived from 2-acetyl pyridine on mild steel in hydrochloric acid: Physicochemical and corrosion inhibition investigations

The mechanism of corrosion inhibition was explored and supplemented by adsorption and surface morphological studies. Quantum mechanical investigations on corrosion behaviour of compounds were also conducted and satisfying correlation was noticed between the results of corrosion measurement methods and quantum mechanical evaluations.

12p tocectocec 25-05-2020 20 2 Download
Quantum mechanical and electrochemical investigations on corrosion inhibition properties of novel heterocyclic Schiff bases

The corrosion inhibition efficiencies of two novel Schiff bases, namely (E)-3-[thiophen-2-lmethyleneamino]benzoic acid (T2YMABA) and (E)-4-(5-[(2-phenylhydrazono) methyl]thiophen-2-yl)benzoic acid (PHMT2YBA) on mild steel (MS) in 1.0M HCl solution has been investigated and compared using electrochemical impedance spectroscopy and potentiodynamic polarization analysis.

10p tocectocec 25-05-2020 19 2 Download
A DFT computational study on the [3+2] cycloaddition between parent thionitrone and nitroethene

A molecular mechanism of the [3+2] cycloaddition has been explored using various DFT theoretical levels.

8p tocectocec 25-05-2020 6 1 Download
NaCl: a facile, environmentally benign catalyst for the synthesis of pyrazole 4-carbonitrile in aqueous media

An ecofriendly methods for the synthesis of medicinally important class of heterocyclic scaffold, pyrazole 4-carbonitrile derivatives by one pot three component reaction of malononitrile, phenyl hydrazine and aromatic aldehyde has been achieved at room temperature.

8p tocectocec 25-05-2020 7 0 Download
Synthesis of fused heterocycles from 2-aryl-5-(chlorosulfonyl)-1,3-oxazole-4-carboxylates and α-aminoazoles involving the Smiles rearrangement

Reaction of methyl 2-aryl-5-(chlorosulfonyl)-1,3-oxazole-4-carboxylates with 1H-pyrazol-5-amines and 1H-1,2,4-triazol-5-amines proceeds with the participation of endocyclic aminoazole nitrogen atoms to yield products containing a primary amino group.

10p tocectocec 25-05-2020 9 0 Download
Báo cáo khoa học: Kinetic and binding studies with purified recombinant proteins ferredoxin reductase, ferredoxin and cytochrome P450 comprising the morpholine mono-oxygenase from Mycobacteriumsp. strain HE5

The P450morsystem fromMycobacteriumsp. strain HE5, supposed to cata-lyse the hydroxylation of different N-heterocycles, is composed of three components: ferredoxin reductase (FdRmor), Fe3S4 ferredoxin (Fd mor) and cytochrome P450 (P450mor). In this study, we purified Fdmorand P450mor as recombinant proteins as well as FdRmor, which has been isolated previ-ously.

12p awards 05-04-2013 38 3 Download
Báo cáo khoa học: Structural basis of charge transfer complex formation by riboﬂavin bound to 6,7-dimethyl-8-ribityllumazine synthase

The amino acid residue tryptophan 27 of 6,7-dimethyl-8-ribityllumazine synthase of the yeastSchizosaccharomyces pombewas replacedby tyrosine. The structures of theW27Y mutant protein in complex with riboflavin, the substrate analogue 5-nitroso-6-ribitylamino-2,4(1H,3H)-pyrimidin-edione, and the product analogue 6-carboxyethyl-7-oxo-8-ribityllumazine,weredeterminedbyX-raycrystallography at resolutions of 2.7–2.8 A ˚ .

7p awards 05-04-2013 45 6 Download
Báo cáo khoa học: Inhibition of cobalamin-dependent methionine synthase by substituted benzo-fused heterocycles

The cobalamin–dependent cytosolic enzyme, methionine synthase (EC.2.1.1.13), catalyzes the remethylation of homocysteine to methionine using 5-methyltetrahydrofolate as the methyl donor. The products of this remethylation – methionine and tetrahydrofolate – participate in the active methionine and folate pathways.

13p inspiron33 23-03-2013 36 3 Download
Ướp tỏi, bia, rượu vào món nướng giảm nguy cơ ung thư

Nghiên cứu của Đại học Kansas (Mỹ) cho thấy, các loại nước sốt với các thành phần gia vị như cỏ xạ hương (thyme), hương thảo (rosemary), tỏi… có thể làm giảm 60 – 80% lượng heterocyclic amine (HCAs) gây ung thư trong các món nướng. Tuy nhiên, không nên ướp nước sốt vào nguyên liệu quá lâu trước khi nướng, vì như vậy có thể giảm thành phần các chất chống oxy hóa có lợi trong nước sốt. Tốt nhất là ướp trước vài tiếng, sau đó khi nướng thực phẩm gần chín thì phủ thêm một chút nước...

4p nkt_bibo14 16-11-2011 50 5 Download
Ngộ Độc Thuốc Chống Trầm Cảm (Antidepressant Overdose)

1/ CÁC THUỐC CHỐNG TRẦM CẢM ĐƯỢC XẾP LOẠI NHƯ THẾ NÀO VÀ CƠ CHẾ TÁC DỤNG CHÍNH CỦA CHÚNG ? Các thuốc chống trầm cảm có thể được chia thành 3 loại lớn, gồm có các thuốc chống trầm cảm 3 vòng (tricyclic antidepressants = TCAs ), monoamine oxidase inhibitors (MAOIs) và các thuốc mới hơn được gọi là các thuốc chống trầm cảm không điển hình (atypicals), dị vòng (heterocyclic) hoặc thế hệ thứ hai (second-generation). ...

2p tuoanh04 07-07-2011 80 4 Download
NGỘ ĐỘC THUỐC CHỐNG TRẦM CẢM

Các thuốc chống trầm cảm có thể được chia thành 3 loại lớn, gồm có các thuốc chống trầm cảm 3 vòng (tricyclic antidepressants = TCAs ), monoamine oxidase inhibitors (MAOIs) và các thuốc mới hơn được gọi là các thuốc chống trầm cảm không điển hình (atypicals), dị vòng (heterocyclic) hoặc thế hệ thứ hai (second-generation). Các thuốc chống trầm cảm 3 vòng (TCAs) được xếp loại thành amines đệ nhị hoac đệ tam và chứa một chuỗi bên với một số thay đổi nhóm methyl. ...

14p thiuyen111 11-04-2011 142 10 Download
Nucleotide

Nucleotide là một hợp chất hóa học gồm có 3 phần chính: một nhóm , nhóm đường, và một hay nhiều nhóm phosphate. Các nucleotide phổ biến nhất là dẫn xuất của purine hoặcpyrimidine, và đường ở dạng pentose (đường chứa 5 cacbon) deoxyribose hay ribose.

8p heoxinhkute 29-07-2010 117 13 Download