HETEROCIKLICNA JEDINJENJA PDF

Heterociklična jedinjenja su ciklična jedinjenja koja pored ugljenika sadrže u strukturi prstena jedan ili više atoma nekih drugih elemenata-. Start studying Heterociklična jedinjenja (Petočlana). Learn vocabulary, terms, and more with flashcards, games, and other study tools. izvor: Wikipedia. Stranice: Poglavlja: Heterociklična Jedinjenja (2 prstena), Heterociklična Jedinjenja (3 prstena), Heterociklična Jedinjenja (4 ili više.

Author: JoJorisar Faumuro
Country: Maldives
Language: English (Spanish)
Genre: Video
Published (Last): 7 October 2011
Pages: 450
PDF File Size: 14.53 Mb
ePub File Size: 3.60 Mb
ISBN: 607-9-69696-424-7
Downloads: 35724
Price: Free* [*Free Regsitration Required]
Uploader: Tecage

However, this reaction is conducted at high temperatures [degrees]C that are difficult to achieve by conventional heating methods.

Krstic, Condensation of 1,3-diketones with cyanoacetamide: Swanson, Synthesis and Biological activity of kappa opioid receptor agonists.

Microwave synthesis requires less acid which results in milder reaction conditions. Kappe, The microwave-assisted synthesis of 5-arylazo-4,6-disubstitutedcyanopyridone dyes, Dyes Pigm.

Heterociklično jedinjenje — Википедија, слободна енциклопедија

In this synthesis, product was obtained starting from cyanoacetamide, ethyl cyanoacetate and ethylamine. Listen Larger documents may require additional load time.

Synthesis of 2-pyridone and compounds based on 2-pyridones under microwave irradiation has certain advantages over conventional methods of synthesis primarily in terms of higher yields and shorter reaction time.

MarkovicDanijela V. Also, the microwave technique is used in the food industry as well as in the pyrolysis of waste materials [46], the preparation of samples for analysis [47], extraction of natural products [48] and hydrolysis of proteins and peptides [49].

  ISO 11451-3 PDF

Also, malonic acid can be used. Jones, Pyridines and their benzo derivatives: Sadinpou, Synthesis, antimicrobial evaluation and QSAR study of some 3-hydroxypyridineone and 3-hydroxypyranone derivatives, Eur.

Oh no, there’s been an error

Besides the conventional synthesis, microwave assisted syntheses were also developed. Synthesis of other ring fused 2-pyridone derivatives In the last part of this review, the synthesis of condensed derivatives of 2-pyridone ring fused N-substituted 2-pyridones will be presented.

Preparation of 3-arylpyridone analogues generated by solution- and solid-phase parallel synthesis methods, Bioorg. Almqvist, Improved procedure for the enantioselective synthesis of dihydrooxazolo and dihydrothiazolo ring-fused 2-pyridones, Tetrahedron Letters 51 Nitrogen can be a part of one of the fragments, or be introduced as a separate fragment. The six-member heterocyclic rings containing nitrogen e. Feng, Microwave assisted synthesis of pyridone derivatives, Chin.

Kategorija:Heterociklična jedinjenja kiseonika – Wikiwand

The Bookmark will be sent with the above message. The mechanism of the reaction is complex and involves Knoevenagel reaction, addition of Michael or Perkin reaction, whereby the degree of enolyzation of dioxo compounds determines the participation of Michael addition [30,31].

Shen, The 2-pyridone antibacterial agents: TFA was used as a proton source reducing the formation of byproducts and increasing the isolated yields. It should be pointed out that a significant number of papers on the reactions of heerociklicna of 2-pyridone ring exist.

At the end of the review, examples of microwave synthesis of ring fused W-substituted 2-pyridones will be discussed. It was demonstrated that the sulfur in the pilicide scaffold could be exchanged for oxygen with an almost retained pilicide activity. Today 7 The reaction of aniline with malonic acid esters produces two moles of ethanol, hteerociklicna affect the equilibrium between the reactants and the reaction jedinjenjaa Figure Unlike conventional conditions high temperature, polar jedinuenja solventsthe newer approach, enzymatically catalyzed synthesis of 2-pyridones, carried under mild reaction conditions, is characterized by high regio- and stereo-selectivity, high purity and final yield of the obtained products [38,39].

  EVERNOTE PENCAST PDF

Agarwal, Microwave prompted multigram synthesis, structural determination, and photo-antiproliferative activity of fluorinated 4-hydroxyquinolinones, Bioorg. Almqvist, Microwave-assisted synthesis and functionalization of 2-pyridones, 2-quinolones and other ring-fused 2-pyridones, Top.

Brkovic and Aleksandar D. In comparison to conventional synthesis, microwave reactor synthesis shows that the reaction is 5 or more times faster using microwave technique.

Heterociklično jedinjenje

Trifluoro acetic acid TFAtosic acid and pyridinium p-toluenesulfonate were used to optimize reaction conditions. First, we will discuss the microwave synthesis of 2-pyridones.

In addition to these products a derivative of 2-hydroxyphenylcyanopyridones was also obtained Table 1, entry