Xin-Ying Zhang,* Xiao-Yan Li, Xue-Sen Fan,* Xia Wang, Gui-Rong Qu, and Jian-Ji Wang. Novel and Efficient Synthesis of Pyrazolo[3,4-b]pyridin-6-ones or Their Hydrogenated Derivatives through One-Pot Reaction in Ionic Liquid. Heterocycles 2009, Vol 78, Issue 4, pp.923-936.
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http://dx.doi.org/10.3987/COM-08-11561
