作者:Scot D. Pedersen、Donald J. Burton
DOI:10.1016/j.jfluchem.2013.01.034
日期:2013.11
useful stereospecific route to (E)-1-aryl-1,2,3,4,4-pentafluoro-1,3-butadienes. Substituents, such as 4-nitro, 2-nitro, H, 3-CF3, 3-OCH3, 2-CH3, 1-iPr react stereospecifically with the dienyl stannane synthon. Only with a bulky electron-withdrawing substuent, such as 2-CF3, did significant isomerization occur in isolation of the aryl diene. The bis-coupled product is formed stereospecifically with 1
Pd(PPh 3)4 / Cu(I)I催化(Z)-1-三-正丁基锡烷基-1,2,3,4,4-五氟-1,3-丁二烯与取代的芳基碘的交叉偶联提供了对(E)-1-芳基-1,2,3,4,4-五氟-1,3-丁二烯有用的立体定向途径。取代基,如4-硝基,2-硝基,H,3-CF 3,3-OCH 3,2-CH 3,1-我镨立体专一性与二烯基锡烷的合成子反应。仅使用笨重的吸电子子,例如2-CF 3在芳基二烯的分离中是否发生了显着的异构化。双偶合产物与1,4-二碘苯立体立体形成。该方法可以扩展到立体定向地制备1-三乙基甲硅烷基-1 E,3 E,-1,2,3,4,5,6,6-七氟-1,3,5-己三烯合成子。