Metal- and Base-Free Three-Component Reaction of Ynones, Sodium Azide, and Alkyl Halides: Highly Regioselective Synthesis of 2,4,5-Trisubstituted 1,2,3-NH-Triazoles - Li, Jihui; Zhang, Yuanqing; Wang, Dong; Wang, Wen; Gao, Tingting; Wang, Lu; Li, Jiting; Huang, Guosheng; Chen, Baohua (Synlett, 2010)