Abstract
(Z)-4-Arylidene-2-methyl-1H-imidazol-5(4H)-ones containing a substituted aminoethyl group at the N-1 atom can be oxidized with an excess of selenium dioxide, resulting in the closure of additional six-membered ring with the formation of an amide group. The obtained compounds showed a substantial bathochromic shift of the absorption maxima relative to the starting (Z)-4-arylidene-2-methyl-1Himidazol-5(4H)-ones, pointing to potential applications of this method for the synthesis of new fluorescent and fluorogenic dyes.
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