Nickel chloride-catalyzed one-pot three-component synthesis of pyrazolophthalazinyl spirooxindoles
作者:Xiao-Nan Zhang、Yong-Xiao Li、Zhan-Hui Zhang
DOI:10.1016/j.tet.2011.07.002
日期:2011.9
A direct and efficient approach for the preparation of pyrazolophthalazinyl spirooxindoles has been developed through one-potthree-component reaction of easily available isatin, malononitrile or cyanoacetic ester, and phthalhydrazide catalyzed by nickel chloride in polyethylene glycol 600. Desired products were obtained in high to excellent yields using a simple workup procedure.