Synthesis of Bioactive Heterocycles: Sigmatropic Rearrangements of 1,3-Dimethyl-6-[methyl(4-aryloxybut-2-ynyl)amino]pyrimidine-2,4(1<b><i>H</i></b>,3<i>H</i>)-diones
作者:K. Majumdar、T. Bhattacharyya
DOI:10.1055/s-2001-16097
日期:——
A number of 1,3-dimethyl-6-[methyl(4-aryloxybut-2-ynyl)amino]pyrimidine-2,4(1H,3H)-diones 4a-i were synthesised in 69 to 80% yields by the reaction of 6-chloro-1,3-dimethyluracil (6-chloro-1,3-dimethylpyrimidine-2,4(1H,3H)-diones) and 1-aryloxy-4-N-methylaminobut-2-yne in refluxing ethanol for 12 hours. The tertiary amines 4a-i were then heated in refluxing 1,2-dichlorobenzene for 17 hours to give 5-[(E)-aryloxymethylidene]-1,3,8-trimethyl-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidine-2,4(1H,3H)-diones 5a-i in 55 to 75% yields.
通过 6-氯-1,3-二甲基脲嘧啶(6-氯-1,3-二甲基嘧啶-2,4(1H,3H)-二酮)和 1-芳氧基-4-N-甲基氨基丁-2-炔反应,合成了一些 1,3-二甲基-6-[甲基(4-芳氧基丁-2-炔基)氨基]嘧啶-2,4(1H,3H)-二酮 4a-i,收率为 69%至 80%、3-二甲基尿嘧啶(6-氯-1,3-二甲基嘧啶-2,4(1H,3H)-二酮)和 1-芳氧基-4-N-甲基氨基丁-2-炔在回流乙醇中反应 12 小时,合成了 4a-i,产率为 69% 至 80%。然后将叔胺 4a-i 在回流的 1,2 二氯苯中加热 17 小时,得到 5-[(E)-芳氧基亚甲基]-1,3,8-三甲基-5,6,7,8-四氢吡啶并[2,3-d]嘧啶-2,4(1H,3H)-二酮 5a-i,收率为 55% 至 75%。