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 |
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Authors: | Gong LiXiaowei Wang Chao TianTongbo Zhang Zhili ZhangJunyi Liu |
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Institution: | The State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100191, China Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China |
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Abstract: | A novel pyrimido4,5-b]1,4]diazepine-2,4,6-trione was synthesized with an efficient strategy. Especially, the key intermediate 2,4-dimethoxypyrimido4,5-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 at three positions. Thus a convenient and effective method for the rapid preparing of multi-substituted pyrimido4,5-b]1,4]diazepines was developed. |
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Keywords: | Pyrimidodiazepine Pyrimido[4 5-b][1 4]diazepine-2 4 6-trione Pyrimido[4 5-b][1 4]diazepine-2 4-dione |
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