Synthesis of nitrogen-containing heterocycles 9. Preparation and carbon-carbon bond cleavage of spiro[cycloalkane[1′,2′,4′]-triazolo[1′,5′-<i>a</i>][1′,3′,5′]triazine] derivatives and related compounds
作者:Yoshiko Miyamoto
DOI:10.1002/jhet.5570370629
日期:2000.11
2-tert-butyl-2-methyl-7-methylthio[1,2,4]triazolo[1,5-a]-[1,3,5]triazines 20, in good yields. In general, bis(methylthio)methylenecyanamide II was found to be a favorable reagent to the one-step synthesis of the spiro[cycloalkanetriazolotriazine] derivatives from the diaminomethylenehydrazones. The spectral data and structural assignments of the fused triazine products are discussed.
环酮1-5的二氨基亚甲基hydr在室温下与N-氰基亚氨酸乙酯(I)或与双(甲硫基)亚甲基氰胺(II)在短暂加热下反应,直接得到相应的螺[环烷[1',2',4'] triazolo [1',5',- a ] [1',3'-5'] triazine]衍生物7-12以中等至高产率生产。在溶液中加热生成环烷基时,螺[环烷三唑三嗪三嗪]衍生物发生开环反应,得到2-烷基-5-氨基[1,2,4]三唑三嗪13-16。受阻无环酮的二氨基亚甲基hydr 17-19通过与II反应生成2-甲基-7-甲硫基[1,2,4]-三唑并[1,5- a ] [1,3,5]三嗪21-23作为主要产品,从潜在的前体中明显损失了2-甲基丙烷2-叔丁基-2-甲基-7-甲基硫代[1,2,4]三唑[1,5- a ]-[1,3,5]三嗪20。通常,发现双(甲硫基)亚甲基氰酰胺II是从二氨基亚甲基hydr一步合成螺[环烷三唑并三嗪]衍生物的