Rhodium-Catalyzed Substitution Reaction of Aryl Fluorides with Disulfides: <i>p</i>-Orientation in the Polyarylthiolation of Polyfluorobenzenes
作者:Mieko Arisawa、Takaaki Suzuki、Tomofumi Ishikawa、Masahiko Yamaguchi
DOI:10.1021/ja8049996
日期:2008.9.17
the fluoride substituent reacted more readily than the chloride and bromide. The reaction of hexafluorobenzene and a diaryl disulfide gave 1,4-diarylthio-2,3,5,6-tetrafluorobenzene, 1,2,4,5-tetraarylthio-3,6-difluorobenzene, and hexaarylthiobenzene in a stepwise manner; pentafluorobenzene gave 1-arylthio-2,3,5,6-tetrafluorobenzene; 1,2,3,4-tetrafluorobenzene gave 1,2-diarylthio-3,6-difluorobenzene;
在催化量的 RhH(PPh3)4 和 1,2-双(二苯基膦基)苯存在下,芳族氟化物、有机二硫化物(0.5 当量)和三苯基膦(0.5 当量)在回流的氯苯中反应得到芳基硫化物产率高。由于三苯基膦捕获氟原子形成二氟化膦,二硫化物的两个有机硫基团有效地反应,并且氟化物取代基比氯化物和溴化物更容易反应。六氟苯与二芳基二硫化物反应分步得到1,4-二芳硫基-2,3,5,6-四氟苯、1,2,4,5-四芳硫基-3,6-二氟苯和六芳硫基苯;五氟苯得到1-芳硫基-2,3,5,6-四氟苯;1,2,3,4-四氟苯得到1,2-二芳硫基-3,6-二氟苯;和 1,2,4,5-四氟苯得到 1, 4-二芳硫基-2-5-二氟苯。多氟苯的聚芳硫基化反应表现出形成1,4-二氟苯的强烈趋势。