In organic synthesis C-H bond activation through direct functionalization of nitrogen heterocycles
represents an efficient regioselective method leading to variety of substituents with diverse functional groups onto the heterocycle
Nowadays, nitrogen containing heterocycle
is important substructure in many fields, especially in pesticides and medicines [1-5].
Clearly structured for easy access to the information, each chapter is devoted to a certain class of heterocycle
, providing a tabular presentation of the natural products to be covered containing the particular heterocyclic ring system along with their biological profile, occurrence and most important physical properties, backed by the appropriate references.
Synthesis and Fluorescent Property of Some Novel Benzothiazoyl Pyrazoline Derivatives Containing Aromatic Heterocycle
, Dyes pigments, 70, 246-250, (2006).
Herein, we also report that when the Lawesson's reagent- mediated cyclization of the Methyl N-[(4-benzoyl-5- phenyl-1-(4-methoxyphenyl)-1H-pyrazol-3- yl)carbonyl]glycinate is performed under reflux conditions in xylene (35%) yield of the desired S- heterocycle
5 is obtained (Scheme-1).
This class of heterocycle
is being examined with respect to its aromaticity and stability, particularly with reference to a variety of dienophiles.
Cui, The Synthesis, Structure and Spectroscopic Properties of Novel Oxazolone, Pyrazolone and Pyrazoline Containing Heterocycle
Chromophores, Dyes and Pigments, 81, 27 (2009).
Detected by the pyrolysis GC/MS, though the main kinds of pyrolysis products from both Fr-I and Fr-II were similar, the larger amount of heterocycle
and aromatic compounds liberated after hydrolysis of Fr-II.
PID is a small weight heterocycle
functionalized with the nitrogen analogue of the Y-triketo moiety, which could experience prototropic changes and bestows on it fascinating properties, such as an intrinsic stability and ability to act as bidentate chelating ligand.
Imidazole is a planar, nontoxic aromatic heterocycle
and is a member of the azole group, where inhibition mechanism involves adsorption onto the copper surface.
Amongst the diverse classes of heterocyclic compounds chroman, a class of oxygen containing heterocycle
forms an important part of many pharmacologically active compounds.
Types of Pigments: Blues (Phthalo); Greens (Phthalo); Reds (Quinacridone, Napthol); Speciality Pigments (Benzimidazolone, Azo Condensation); Yellows and Oranges (Azo and Heterocycle
, Diarylides, Hansas, Specialties)