Synthesis of 3,5-disubstituted 1-amino-1,3,5-triazine-2,4,6-triones (or 1-aminocyanurates) by cyclic transformation of 1,3,4-oxadiazol-2(3<i>H</i>)-one derivatives
作者:François Chau、Jean-Claude Malanda、René Milcent
DOI:10.1002/jhet.5570340536
日期:1997.9
3,5-triazine-2,4,6-trione derivatives 7 in poor yields. However, compounds 7 were obtained in better yields when the sodium salts of 5-aryl(or methyl)-1,3,4-oxadiazol-2(3H)-ones 1 were treated with two equivalents of aryl(or ethyl)isocyanates. Acidic hydrolysis of 1-acetamido-3,5-diphenyl-1,3,5-triazine-2,4,6-trione (7i) provided the corresponding free N-amino derivative 9. Nitrous deamination of 9
在无水二甲基甲酰胺中存在氢化钠的情况下,将5-芳基(或甲基)-3-苯基氨基甲酰基-1,3,4-恶二唑-2(3 H)-ones 2转化为1-苯甲酰胺基(或对乙酰氨基) -3,5-二苯基-1,3,5-三嗪-2,4,6-三酮衍生物7的收率不佳。但是,将5芳基(或甲基)-1,3,4-恶二唑-2(3 H)-ones 1的钠盐用两当量的芳基(或乙基)异氰酸酯处理时,化合物7的收率更高。。酸性水解的1-acetamido-3,5-diphenyl-1,3,5-triazine-2,4,6-trione(7i)提供了相应的游离N-氨基衍生物9。亚硝化9得到已知的3,5-二苯基-1,3,5-三嗪-2,4,6-三酮(11)。该环状转化是有报道的第一个提供1,3,5-三嗪-2,4,6-三酮衍生物的转化。