Monocyclic 1,2,3-triazines have been allowed to react with silyl enol ether or ketene silyl acetal in the presence of 1-chloroethyl chloroformate to give 2-(1-chloroethoxycarbonyl)-5-substituted-2,5-dihydrotriazines in good yields. These dihydro adducts are oxidized by ceric ammonium nitrate in CH3CN–H2O to afford 5-substituted 1,2,3-triazines.
T. Itoh, Y. Matsuya, H. Hasegawa, K. Nagata, M. Okada and A. Ohsawa, J. Chem. Soc., Perkin Trans. 1, 1996, 2511 DOI: 10.1039/P19960002511
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