Rapid access to multi-substituted pyrimido[4,5-b][1,4]diazepine-2,4,6-trione and pyrimido[4,5-b][1,4]diazepine-2,4-dione as novel and versatile scaffolds for drug discovery
作者:Gong Li、Xiaowei Wang、Chao Tian、Tongbo Zhang、Zhili Zhang、Junyi Liu
DOI:10.1016/j.tetlet.2012.06.143
日期:2012.9
was synthesized with an efficient strategy. Especially, the key intermediate 2,4-dimethoxypyrimido[4,5-b][1,4]diazepin-6-one was promoted by one pot tandem reduction–cyclization with Na2S2O4. Subsequently, reduction of lactams 6 with LiAlH4 afforded a more flexible scaffold of pyrimidodiazepines. The synthetic strategy was versatile since it facilitated the sequential functionalization on the pyrimidodiazepine
以一种有效的策略合成了一种新型的嘧啶并[4,5- b ] [1,4]二氮杂-2,4,6-三酮。特别是,用Na 2 S 2 O 4进行一锅串联还原-环化反应可促进关键中间体2,4-二甲氧基嘧啶[4,5- b ] [1,4]二氮杂6-1 。随后,用LiAlH 4还原内酰胺6得到嘧啶二氮杂卓的更灵活的支架。合成策略是通用的,因为它促进了在嘧啶二氮卓在三个位置上的顺序功能化。因此,开发了一种快速制备多取代的嘧啶并[4,5- b ] [1,4]二氮杂s的简便有效的方法。