THE SYNTHESIS OF 5-SUBSTITUTED 1, 2, 3, -TRIAZINES WITH KETENE SILYL ACETALS AND CERIC AMMONIUM NITRATE

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Monocyclic 1, 2, 3-triazines were reacted with ketene silyl acetal or silyl enol ether in the presence of 1-chloroethyl chloroformate to give 5-substituted 2-(1-chloroethoxycarbonyl)-2, 5-dihydrotriazines. These dihydro-adducts were readily oxidized and hydrolyzed with ceric ammonium nitrate in CH₃CN/H₂O to afford 5-substituted triazines.