No abstract

In this study N,N,N 0 ,N 0 -tetrabromobenzene-1,3-disulfonamide was used as a reagent for the threecomponent one-pot synthesis of some novel 9-aryl-9H-2,4,5,7-tetramethyl-diuracilopyrans, which has not been published before, as well as 9-aryl-3,4,6,7-tetrahydro-2H-pyran-1,8(5H,9H)-diones in excellent yields. This is obtained from the condensation of aromatic and heterocyclic aldehydes and N,Ndimethylbarbituric acid or cyclohexane-1,3-diones in ethanol at room temperature.

N,N,N',N'‐tetrabromobenzene‐1,3‐disulfonamide and poly(N,N’‐dibromo‐N‐ethyl‐benzene‐1,3‐disulfonamide) were used as efficient catalysts for one‐pot synthesis of new quinazoline derivatives from various aldehydes, 2‐amino‐benzophenone, and ammonium acetate in good to excellent yields and new benzopyrano[2,3‐d]pyrimidine derivatives from salicylic aldehydes, various cyclic amines, and malononitrile in good to high yields.

Starting from the readily available p‐nitrobenzylamine a series of 2‐Alkylthio‐1‐[4‐(N‐α‐ethoxycarbonylbenzyl)aminobenzyl]‐5‐hydroxymethylirnidazoles were prepared.

Recently, magnetic iron oxide nanoparticles functionalized with various organic groups increasing attention in the synthesis of the organic compounds. In this study, ionic liquid nano-magnetic pyridinium-tribromide (MNPs@SiO 2 -Pr-AP-tribromide) as a new nano-catalyst was synthesized. The structure of the catalyst was identified by FT-IR, TGA, XRD, FE-SEM, EDX, EDS, TEM and VSM analysis. The nanocatalyst was efficient for the synthesis of quinoline derivatives through the one-pot reaction of 2-amino-5-chlorobenzophenone and pentane-2,4-dione. The advantages of this catalyst are easy preparation, large surface area, renewability, high thermal stability, high activity, shortening reaction time, improving efficiency, easy purification, and mild reaction conditions.