Stereospecific preparation of (1E,3E,5E)-3.4-difluoro-1,6-diphenylhexatriene and (2E,4E,6E)-diethyl-4,5-difluoroocta-2,4,6-trienedioate
作者:Qibo Liu、Dale C. Swenson、Donald J. Burton
DOI:10.1016/j.jfluchem.2010.12.008
日期:2011.2
(E/Z = 89/11) with (E)-(1,2-difluoro-1,2-ethenediyl)bis[tributylstannane], 1, in DMF at room temperature stereospecifically gave only (1E,3E,5E)-3,4-difluoro-1,6-diphenylhexatriene. Similarly, palladium(0) catalyzed coupling of (E)-ethyl 3-bromoacrylate as the vinyl halide precursor stereospecifically gave (2E,4E,6E)-diethyl-4,5-difluoroocta-2,4,6-trienedioate. This work demonstrates that a non-fluorine-containing
在室温下,DMF中钯(0)在DMF中催化β-溴苯乙烯(E / Z = 89/11)与(E)-(1,2-二氟-1,2-乙炔基)双[三丁基锡烷] 1的偶联仅给出(1 E,3 E,5 E)-3,4-二氟-1,6-二苯基己三烯。类似地,钯(0)催化的(E)-3-溴丙烯酸乙酯(作为卤化乙烯基酯前体)的立体定向偶合得到(2 E,4 E,6 E)-二乙基-4,5-二氟辛基-2,4,6-三烯二酸酯。这项工作表明,不含氟的乙烯基溴将选择性地与1偶联。并能够实现立体定向的混合多烯体系的制备。的(ë) -乙基3- bromoacrylate与耦合1示出了混合官能己三烯系统可以很容易地访问通过这一方法。(2 E,4 E,6 E)-二乙基-4,5-二氟辛基-2,4,6-三烯二酸酯的X射线结构证实了其结构。