Parallel Synthesis of Novel 3-Substituted 1-Ethyl-6-methylpyrimido[4,5-c]pyridazine-5,7(1<i>H</i>,6<i>H</i>)-dione Analogs
作者:Yongsheng Chen、Jack R. Barber、Shi Chung Ng、Yuefen Zhou
DOI:10.1080/00397910903013788
日期:2010.2.26
A library of novel 1H-pyrimido[4,5-c]pyridazine-5,7-dione analogs was prepared in a parallel fashion via the cyclization of 6-(1-ethylhydrazinyl)-3-methylpyrimidine-2,4(1H,3H)-dione (4) with α-bromoketones and was then isolated by a two-step purification method with >90% purity. Both the library synthesis and purification method proved suitable for analogs with a high diversity of substitution at the