A Three-Component Approach to 3,5-Diaryl-1,2,4-thiadiazoles under Transition-Metal-Free Conditions
作者:Hao Xie、Jinhui Cai、Zilong Wang、Huawen Huang、Guo-Jun Deng
DOI:10.1021/acs.orglett.6b00806
日期:2016.5.6
A novel route is disclosed for the synthesis of 1,2,4-thiadiazoles starting from amidines, elementalsulfur, and 2-methylquinolines or aldehydes under transition-metal-free conditions. This three-component approach affords efficient and rapid access to 3,5-diaryl substituted 1,2,4-thiadiazoles with good tolerance of a broad range of funcitional groups. Mechanistic studies reveal a radical-involved
Iodide-promoted transformations of imidazopyridines into sulfur-bridged imidazopyridines or 1,2,4-thiadiazoles
作者:Shi-Tang Ma、Xiao-Xiao Zhu、Jing-Yu Xu、Ying Li、Xiao-Mei Zhang、Cheng-Tao Feng、Yizhe Yan
DOI:10.1039/d1cc01044a
日期:——
A NaI-promoted sequential double carbon–sulfurbondformation was developed to afford sulfur-bridged imidazopyridines, using Deoxofluor as the sulfur source and requiring only 15 min at room temperature. Using this process, imidazo[1,5-a]pyridines could also be transformed to 1,2,4-thiadiazoles in the presence of ammonium salt with the formation of both carbon–sulfur and nitrogen–sulfur bonds. This