23905-58-0

Upstream product

• 13906-09-7 2-mercapto-3,4-dihydro-4-quinazolone 
• 70-11-1 α-bromoacetophenone 
• 13906-09-7 2-mercapto-3H-quinazolin-4-one 
• 13906-09-7 2-thioxo-2,3-dihydro-1H-quinazolin-4-one 

Downstream Products

• 4159-03-9 2,5-diphenyl-[1,4]dithiine 
• 86-96-4 1,2,3,4-tetrahydro-quinazoline-2,4-dione 
• 23905-59-1 3-Phenyl-5-oxo-5H-thiazolo<2,3-b>chinazolin 
• 1333506-19-6 2-(2-hydroxy-2-phenylvinyl)quinazolin-4-ol 

Relevant academic research and scientific papers

Synthesis and evaluation of 2-substituted 4(3H)-quinazolinone thioether derivatives as monoamine oxidase inhibitors

In the present study, a series of fourteen 2-mercapto-4(3H)-quinazolinone derivatives was synthesised and evaluated as potential inhibitors of the human monoamine oxidase (MAO) enzymes. Quinazolinone is the oxidised form of quinazoline, and although this class has not yet been extensively explored as MAO inhibitors, it has been shown to possess a wide variety of biological activities. Among the quinazolinone derivatives investigated, seven compounds (IC50 50 value of 0.142 μM. Further investigation showed that this inhibitor is a reversible and competitive inhibitor of MAO-B with a Ki value of 0.068 μM. None of the test compounds were MAO-A inhibitors. Analysis of the structure-activity relationships (SARs) for MAO-B inhibition shows that substitution on the C2 position of quinazolinone with a benzylthio moiety bearing a Cl, Br or I on the meta position yields the most potent inhibitors of the series. In contrast, substitution with the unsubstituted benzylthio moiety (IC50 = 3.03 μM) resulted in significantly weaker inhibition activity towards MAO-B. This study suggests that quinazolinones are promising leads for the development of selective MAO-B inhibitors which may be used for the treatment of neurodegenerative disorders such as Parkinson's disease.

The Eschenmoser coupling reaction under continuous-flow conditions

The Eschenmoser coupling is a useful carbon-carbon bond forming reaction which has been used in various different synthesis strategies. The reaction proceeds smoothly if S-alkylated ternary thioamides or thiolactames are used. In the case of S-alkylated s

Synthesis and antihypertensive activity of some quinazolinone derivatives

The fused 4(3H)-quinazolinone derivatives 4a-e were synthesized by treating 2-thioxo-1H,3H-quinazolin-4-one with halides. A preliminary pharmacological evaluation revealed that the compounds, 4b-4d act as antihypertensives in anesthetized rats at i.v. dos