A remarkable regiocontrol in the palladium-catalyzed silylstannylation of fluoroalkylated alkynes – highly regio- and stereoselective synthesis of multi-substituted fluorine-containing alkenes
作者:Tsutomu Konno、Ryoko Kinugawa、Takashi Ishihara、Shigeyuki Yamada
DOI:10.1039/c3ob41903g
日期:——
On treating fluorine-containing internal alkynes with 1.2 equiv. of (trimethylsilyl)tributyltin in the presence of 2.5 mol% of Pd(PPh3)2Cl2 in THF at the reflux temperature for 6 h, the silylstannylation reaction proceeded smoothly to afford the corresponding silylstannylated adducts in high yields in a highly regio- and cis-selective manner. Switching the palladium catalyst from Pd(PPh3)2Cl2 to Pd(t-BuNC)2Cl2
用1.2当量处理含氟内部炔烃。在回流温度下,在THF中存在2.5 mol%Pd(PPh 3)2 Cl 2的条件下,对(三甲基甲硅烷基)三丁基锡进行甲硅烷基锡烷基化反应平稳进行,以高收率得到高产率的相应甲硅烷基锡烷基化加合物。和CIS -选择性的方式。将钯催化剂从Pd(PPh 3)2 Cl 2转换为Pd(t -BuNC)2 Cl 2促进了区域选择性相反的甲硅烷基锡烷基化加合物的形成。将如此得到的silylstannylated加合物进行的Stille交叉偶联反应以提供相应的氟烷基乙烯基硅烷,其C-Si键通过在TBAF和Zn(OTF)的存在下用醛处理转化为C-C键2时,对应的以限定的立体化学,以中等至良好的收率得到氟代烷基化的四取代的烯烃。