Synthesis of 6,7,8,9-tetrahydro-5<i>H</i>-pyrimido-[4,5-<i>b</i>][1,4]diazepine-6,8-diones
作者:Oludotun A. Phillips、Edward E. Knaus
DOI:10.1002/jhet.5570300148
日期:1993.1
7,9-trimethyl-5H-pyrimido[4,5-b][1,4]diazepine-6,8-dione (6). Reaction of 6,7,8,9-tetrahydro-5H-pyrirnido[4,5-b][1,4]diazepine-6,8-dione (4) with 4.2 equivalents of sodium hydride and 4.1 equivalents of iodomethane afforded 6,7,8,9-tetrahydro-5,7,7, 9-tetramethyl-5H-pyrimido[4,5-b][1,4]diazepine-6,8-dione (7). 6,7,8,9-Tetrahydro-5,7,7,9-tetramethyl-5H-pyrimido[4,5-b][1,4]diazepine-6,8-dione (7) exhibited
乙醇钠催化的4,5-二氨基嘧啶(3)与丙二酸二乙酯的缩合反应得到6,7,8,9-四氢-5 H-嘧啶基[4,5- b ] [1,4]二氮杂-6,8-二酮(4)。使用氢化钠和两当量的碘甲烷将6,7,8,9-四氢-5 H-嘧啶[4,5- b ] [1,4]二氮杂-6,8-二酮(4)甲基化,得到5,9 -二甲基-6,7,8,9-四氢-5 H-嘧啶基[4,5- b ] [1,4]二氮杂-6,8-二酮(5),将其用氢化钠和一当量的碘甲烷进一步甲基化产生6,7,8,9-四氢-5,7,9-三甲基-5 H-嘧啶[4,5- b] [1,4]二氮杂-6,8-二酮(6)。得到6,7,8,9-四氢-5 H-吡啶并[4,5- b ] [1,4]二氮杂-6,8-二酮(4)与4.2当量的氢化钠和4.1当量的碘甲烷的反应6,7,8,9-四氢-5,7,7,9-四甲基-5 H-嘧啶[4,5- b ] [1,4]二氮杂-6,8-二酮(7)。6