作者:OPPENLANDER, THOMAS、PFOERTNER, KARL-HEINZ、SCHONBOLZER, PETER
DOI:——
日期:——
Photooxygenation of 5-aryl-2,4-diaminopyrimidines leading to 4-amino-1,3,5-triazin-2-yl ketones and, in the presence of sodium borohydride, to 5,6-dihyro-4(3<i>H</i>)-pyrimidinones
photosensitized oxygenation of 5-aryl-2,4-diaminopyrimidines 1 in protic solvent led to the formation of the new 4-amino-1,3-5-triazin-2-yl ketones 2 in high yields. The structures of 2 were elucidated by spectroscopical means, especially by 13C-NMR and UV data. Photooxygenation of 2,4-diamino-5-(p-chlorophenyl)-6-ethylpyrimidine 1a under reductive conditions, e.g. In the presence of excess NaBH4, gave 2