Metal‐Free Thiolation of Imidazopyridines with Functionalized Haloalkanes Using Elemental Sulfur. - Zhang, Jun‐Rong; Zhan, Ling‐Zhi; Wei, Liang; Ning, Yun‐Yun; Zhong, Xiao‐Lin; Lai, Jing‐Xiong; Xu, Li; Tang, Ri‐Yuan (Advanced Synthesis & Catalysis, 2018)