作者:Bo Ram Kim、Eun Jung Kim、Gi Hyeon Sung、Jeum-Jong Kim、Dong-Soo Shin、Sang-Gyeong Lee、Yong-Jin Yoon
DOI:10.1002/ejoc.201300379
日期:2013.5
The one-pot regioselective consecutive multihalogenation of 2,2′-bithiophene (1) was demonstrated. Compound 1 was consecutively halogenated with lithium halides such as lithium bromide, chloride, and/or iodide in the presence of lead tetraacetate in chloroform at room temperature or under reflux conditions to give 5-bromo(or chloro)-5′-iodo(or chloro)-, 3-bromo(or chloro)-5,5′-dibromo(or dichloro,
证明了 2,2'-联噻吩 (1) 的一锅区域选择性连续多卤化。在室温或回流条件下,在四乙酸铅的存在下,将化合物 1 用溴化锂、氯化锂和/或碘化锂等卤化锂连续卤化,得到 5-溴(或氯)-5'-碘(或氯)-, 3-溴(或氯)-5,5'-二溴(或二氯、二碘)-, 3,3'-二溴-(或二氯)-5,5'-二碘(或二溴、二氯) -, 和 3,3',5-三溴(或三氯)-5'-碘(或溴)-2,2'-联噻吩。值得注意的是,该工艺为一锅连续多卤化提供了一种区域选择性方法,其产率和选择性也高于分步和并发卤化方法。