2-Imidazoline

2-Imidazoline

2-Imidazoline
Skeletal formula of imidazoline
Ball-and-stick model of the imidazoline molecule
Names
IUPAC name
4,5-Dihydro-1H-imidazole
Identifiers
 Y
ChEBI  Y
ChemSpider  Y
Jmol-3D images Image
PubChem
Properties
C3H6N2
Molar mass 70.10 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 Y  (: Y/N?)

2-Imidazoline (dihydroimidazoles) is one of three isomers of the

  1. ^ a b c d Liu, H. and Du, D.-M. (2009), Recent Advances in the Synthesis of 2-Imidazolines and Their Applications in Homogeneous Catalysis. Adv. Synth. Catal., 351: 489–519. doi:10.1002/adsc.200800797
  2. ^ N. MacInnes and S. Duty (2004). "Locomotor effects of imidazoline I2-site-specific ligands and monoamine oxidase inhibitors in rats with a unilateral 6-hydroxydopamine lesion of the nigrostriatal pathway".  
  3. ^ David Crouch, R. (March 2009). "Synthetic routes toward 2-substituted 2-imidazolines". Tetrahedron 65 (12): 2387–2397.  
  4. ^ Guinchard, X., Valle´e, Y., Denis, J. N. (2007), Total Synthesis of Marine Sponge Bis(indole) Alkaloids of the Topsentin Class. J. Org. Chem, 72(10), 3972-3975. doi:10.1021/jo070286r
  5. ^ Dardonville, C. and Rozas, I. (2004), Imidazoline binding sites and their ligands: An overview of the different chemical structures. Med. Res. Rev., 24: 639–661. doi: 10.1002/med.20007
  6. ^ “Clonidine”, Pubmed Health, http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0000623/
  7. ^ Tyagi, R., Tyagi, V. K., Pandey, S. K. (2007), Imidazoline and its derivatives: an overview. J. Oleo. Sci., volume 56, 211-222. doi:10.5650/jos.56.21
  8. ^ Ishihara, M., Togo, H. (2006), An Efficient Preparation of 2-Imidazolines and Imidazoles from Aldehydes with Molecular Iodine and (Diacetoxyiodo)benzene. Synlett, 227-230. doi:10.1055/s-2005-923604

References

See also

Imidazoles can be prepared from dehydrogenation of imidazolines.[8]

Imidazolines as Precursors of Imidazoles

Imidazoline derivatives have extensive applications in surfactant in small proportions for improving detergent qualities for various purposes (fabric softeners, hair and fabric conditioning).[7]

Industrial Applications

As a structural analogue of 2-oxazolines, 2-imidazolines have been developed as ligands in coordination chemistry. The substitutions on the nitrogen atom in the imidazoline ring provide opportunities for fine-tuning the electronic and steric properties. Some of the complexes function as catalysts for Suzuki–Miyaura couplings, Mizoroki–Heck reactions, Diels–Alder reactions, asymmetric allylic substitution, [3,3] sigmatropic rearrangement, Henry reactions, etc.[1]

Homogeneous Catalysis

2-imidazolines have been investigated as antihyperglycemic, anti-inflammatory, antihypertensive, antihypercholesterolemic, and antidepressant reagents.[1][5]The imidazoline-containing drug clonidine is used alone or in combination with other medications to treat high blood pressure. It is also used in the treatment of dysmenorrhea, hypertensive crisis, Tourette's syndrome and attention deficit hyperactivity disorder (ADHD).[6]

Pharmaceutical Applications

Imidazoline has been found in various natural products. Natural molecules topsentin D and spongotine B were discovered in several marine sponges. These metabolites have received considerable attention because of their potent properties such as antitumor, antiviral, and anti-inflammatory activities.[4]

Imidazoline in Natural Products

Synthesis of imidazolines from nitrile and from ester precursors.

A variety of routes exist for the synthesis of imidazolines,[1][3] with the most common methods involving the condensation of 1,2-diamines with nitriles or esters. The nitrile based route is effective for both alkyl and aryl nitriles and requires high temperatures or acid catalysis.

Synthesis of Imidazoline

Many imidazolines are biologically active.[2] Most bio-active derivatives bear a substituent (aryl or alkyl group) on the carbon between the nitrogen centers. Some generic names include oxymetazoline, xylometazoline, tetrahydrozoline, and naphazoline.

Biological role

Contents

  • Biological role 1
  • Synthesis of Imidazoline 2
  • Imidazoline in Natural Products 3
  • Pharmaceutical Applications 4
  • Homogeneous Catalysis 5
  • Industrial Applications 6
  • Imidazolines as Precursors of Imidazoles 7
  • See also 8
  • References 9

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