Synthesis of 2,3,4,11b-Tetrahydro-1H-pyridazino[6,1-a]isoquinolines via the Three-Component Reaction of 2-Alkynylbenzaldehydes, a Sulfonohydrazide and Dimethyl Cyclopropane-1,1-dicarboxylate - Yu, Xingxin; Qiu, Guanyinsheng; Liu, Jianping; Wu, Jie (Synthesis, 2011)