A Novel and Efficient Synthesis of 2-Aryl-2H-indazoles via SnCl2-Mediated Cyclization of 2-Nitrobenzylamines - Shi, Da-Qing; Dou, Guo-Lan; Ni, Sai-Nan; Shi, Jing-Wen; Li, Xiao-Yue; Wang, Xiang-Shan; Wu, Hui; Ji, Shun-Jun (Synlett, 2007)