June 2004 - 6 articles
A series of quinoxaline derivatives has been synthesized by reacting 3-hydrazinoquinoxalines 1a,b with many bifunctional reagents. Reaction of 1a,b with chloroacetyl chloride and ethyl chloroacetate afforded 1-chloromethyl[1,2,4]tnazoIo[4,3-a]quinoxa...
A new simple, precise, accurate and selective high-performance thin-layer chromatographic (HPTLC) method has been developed for the simultaneous deter-mination of five mixtures: atenolol and chlorthalidone (Mix. l), enalapril maleate and hydrochlorot...
A reversed-phase HPLC method with spectrophotometric detection was developed for the simultaneous determination of labetalol (LBT) and hydrochloro-thiazide (HCD). The chromatographic separation was performed using a Microbondapak C18 column (4.6 i.d....
The anodic behaviour of isradipine was studied using cyclic voltammetry (CV), direct current (DCt) and differential-pulse (DPP) polarography. lsradipine exhibited well-defined anodic polarographic waves over the pH range of 4–8 in Britton-Robinson bu...
A new simple, accurate and reasonably sensitive spectrophotometric method is described for the determination of reserpine based on the oxidation with sodium metaperiodate in the presence of acetic acid and coupling with 3-methyl-2-benzo thiazolinone...
Erhitzen von Amiloridhydrochlorid (1 • Hcl) in Acetatpuffer pH 4.6 führte zu Amiloridacetat (1 • AcOH), dem Pyrazindiamin 6 und dem Acylureid 7. Das Pteridinon 3 wurde beim Erhitzen von 1 • Hcl in DMF unter Rückfluß erhalten.
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