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The highly effectual synthesis of 4,6-diarylpyrimidin-2(1 H )-ones  via  the one-pot multicomponent reaction of acetophenones with arylaldehydes and urea in the presence of trimethylsilyl chloride and a catalytic amount of the ionic liquid  N , N , N ′, N ′-tetramethylethylenediaminium- N , N ′-disulfonic acid hydrogen sulfate ([TMEDSA][HSO 4 ] 2 ) under solvent-free conditions has been described. The reaction results and conditions of the catalytic system have been compared with previously reported catalysts. [TMEDSA][HSO 4 ] 2  afforded better results in comparison with the reported catalysts in terms of one or more of these factors: yield, temperature, the reaction media, time, and generality. Moreover, a plausible reaction mechanism based on dual functionality of the catalyst has been proposed.

zeitschrift für naturforschung b

Highly effectual synthesis of 4,6-diarylpyrimidin-2(1 H )-ones using  N , N , N ′, N ′-tetramethylethylenediaminium- N , N ′-disulfonic acid hydrogen sulfate as a dual-functional catalyst