31969-10-5Relevant academic research and scientific papers
Pteridines. Part CXI. Pteridine-based photoaffinity probes for nitric oxide synthase and aromatic amino acid hydroxylases
Groehn, Viola,Froehlich, Lothar,Schmidt, Harald H. H. W.,Pfleiderer, Wolfgang
, p. 2738 - 2750 (2000)
Various 6-substituted pteridines and 5,6,7,8-tetrahydropterins carrying photolabile functions at the side chain (see 7, 20-22, 34-36, 38, and 39) as well as at the 5-position (see 27-29) were synthesized from pterin and from 6-phenylpterin (1) and 6-(hydroxymethyl)pterin (10). Attachment of the photoaffinity labels via ester bonds required a special protecting-group strategy based upon acid-labile (see 30-33) and β-eliminating blocking groups (see 17-19). The 6-(4-azidophenyl)pterin (7) was obtained from 6-phenylpterin (1) via intermediates 2 and 4-6, due to the low solubility of simple pterins in general. The pteridine derivatives 21, 22, 25, 26, 28, 29, 32, 33, 35, 36, 38, and 39 were screened as inhibitors of neuronal (type I) NO synthase (see Table) from porcine cerebellum. of which 22, 35, 36, and 38 showed interesting inhibitory activity with similar potency and effectiveness.
Process For The Preparation Of Optically Pure Tetrahydropterins And Derivatives, And Specifically Of Optically Pure Tetrahydrofolic Acid And Derivatives Thereof, By Stereospecific Hydrogenation
-
Page/Page column 18, (2009/01/20)
Process for the preparation of tetrahydropterin and tetrahydropterin derivatives by hydrogenating pterin and pterin derivatives with hydrogen in the presence of a hydrogenating catalyst, in which the hydrogenation is carried out in a polar reaction medium and metal complexes that are soluble in the reaction medium are employed as the hydrogenation catalysts. The process is suited to the hydrogenation, particularly asymmetric hydrogenation, of folic acid, folio acid salts, folio acid esters, folio acid ester salts or dihydroforms thereof, with the proviso that in the event of using folic acid, carboxylic acid salts thereof or dihydroforms thereof the reaction medium is aqueous, and in the event of using folic acid esters, folic acid ester salts or dihydroforms thereof the reaction medium is an alcohol. The process opens up straightforward access to achiral and chiral pterin derivatives.
Determination of Pterins in Biological Samples by Liquid Chromatography/Electrochemistry with a Dual-Electrode Detector
Lunte, Craig E.,Kissinger, Peter T.
, p. 1458 - 1462 (2007/10/02)
The pterins are a family of compounds that are currently of great interest in medicine and biology.Biopterin, in its reduced form, serves as the cofactor to the enzyme which catalyze the rate-limiting reactions in the biosynthesis of the catecholamines and serotonin.As such, it may serve a role in the regulation of the neurotransmitters.Abnormal pterin concentrations have been observed in the urine and serum of patiens with several diseases.No currently available analytical method is totally satisfactory for the determination of pterins in biological samples.They lack either specificity or the ability to detect both the oxidzed and reduced forms of the pterins.Liquid chromatography/electrochemistry (LCEC) using a dual-electrode detector can overcome both of these problems.A method has been developed that is capable of determining several pterin species and their various oxidation states in biological samples.The dual-electrode detector used in a parallel-adjacent configuration is also capable of enhancing peak identity assignments and selectively determining easily oxidized compounds in the presence of harder to oxidize compounds.
