A highly selective photoinduced selenoperfluoroalkylation of terminal acetylenes by using a novel binary system of perfluoroalkyl iodide and diphenyl diselenide
作者:Kaname Tsuchii、Akiya Ogawa
DOI:10.1016/j.tetlet.2003.09.182
日期:2003.12
Upon irradiation through Pyrex with a xenon lamp (hν>300 nm), terminal acetylenes undergo highly selective selenoperfluoroalkylation with perfluoroalkyl iodide and diphenyldiselenide. In this reaction, perfluoroalkyl and phenylseleno groups are selectively introduced into the terminal and internal positions of acetylenes, respectively.
Vinylic selenides and tellurides are useful synthetic intermediates for preparation of vinylic compounds and carbonylcompounds. Herein we report highly selective perfluoroalkylselenation and -telluration of terminal alkynes by using heteroatom mixed systems, i.e., (PhSe)2/RfI and (PhTe)2/RfI, upon photoirradiation. When the reaction of aromatic alkynes and conjugated enynes with diphenyl diselenide
乙烯基硒化物和碲化物是用于制备乙烯基化合物和羰基化合物的有用的合成中间体。在本文中,我们报道了通过使用杂原子混合体系,即(PhSe)2 / R f I和(PhTe)2 / R f I,在光辐照下,对末端炔烃进行高度选择性的全氟烷基硒化和脱乙酰。当芳族炔烃的反应和共轭烯炔与碳酸二苯联硒化物和全氟烷基碘化物在三氟甲苯(BTF)作为溶剂通过照射氙灯通过派热克斯传导(hν> 300nm),炔的新型全氟烷基硒化在区域和立体上发生,以高收率得到1-(全氟烷基)-2-(苯基硒代)烯烃。可以将类似的方法应用于芳族炔烃的光诱导全氟烷基碲化反应,并将全氟烷基和苯基碲基团区域选择性地和立体选择性地引入炔烃的末端和内部位置。由于全氟烷基(氟)基团使得可以通过氟/有机/水萃取技术容易地分离产物,因此所获得的全氟烷基硒代和芳构化产物有望用作合成中间体。