5-Aminopyrazole Dimerization: Cu-Promoted Switchable Synthesis of Pyrazole-Fused Pyridazines and Pyrazines via Direct Coupling of C-H/N-H, C-H/C-H, and N-H/N-H Bonds by Yi-Xin Chai, Jun-Jie Ren, Yi-Ming Li, Yi-Cheng Bai, Qing-Qing Zhang, Yi-Zhen Zhao, Xue Yang, Xiao-Han Zhang, Xin-Shuang Zhang, An-Xin Wu, Yan-Ping Zhu, Yuan-Yuan Sun

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