A simple and practical method for the synthesis of 2-amino-5,6-dihydro-5,7-diarylquinazolin-4-ols
作者:S. Senguttuvan、Samuthira Nagarajan
DOI:10.1002/jhet.229
日期:2009.11
Abstractmagnified image We report an efficient and new method of synthesis of 2‐amino‐5,6‐dihydro‐5,7‐diarylquinazolin‐4‐ols by the reaction of substituted cyclohexenones with guanidine hydrochloride in presence of NaOEt. The reactions are with 50–72% yield. All the synthesized compounds are characterized using IR, NMR and CHN analysis. J. Heterocyclic Chem., (2009).
Antioxidant and antimicrobial studies on fused-ring pyrazolones and isoxazolones
A series of 3-nitrochalcones have been synthesized enroute towards fused ring pyrazolones and isoxazolones. Base catalyzed condensation of the chalcones with ethylacetoacetate yielded cyclohexenones in good yields (74–76%). The treatment of cyclohexenones with hydrazine hydrate or hydroxylamine chloride in the presence of a base afforded the corresponding fused-ring pyrazolinones (70–78% yield) and