T. Itoh et al., A NEW ENTRY TO THE SYNTHESIS OF 5-SUBSTITUTED 1,2,3-TRIAZINES BY REACTION WITH SILYL ENOL ETHERS AND CERIC AMMONIUM-NITRATE, Journal of the Chemical Society. Perkin transactions. I, (20), 1996, pp. 2511-2515
Monocyclic 1,2,3-triazines have been allowed to react with silyl enol
ether or ketene silyl acetal in the presence of 1-chloroethyl chlorofo
rmate to give oethoxycarbonyl)-5-subsntuted-2,5-dihydrotriazines in go
od yields; These dihydro adducts are;oxidized by eerie ammonium nitrat
e in CH3CN-H2O to afford 5-substituted 1,2,3-triazines.