Preparation and chemistry of new unsymmetrically substituted tetrachalcogenofulvalenes bearing CN(CH2)2X and HO(CH2)2X groups (X = S or Se)
作者:Laurent Binet、Jean Marc Fabre、Claude Montginoul、Klaus Baek Simonsen、Jan Becher
DOI:10.1039/p19960000783
日期:——
Several unsymmetrically substituted TTFs bearing the S(CH2)2CN protecting group have been prepared by standard cross coupling in triethyl phosphite from the key intermediate 4,5-bis(2′-cyanoethylsulfanyl)1,3-dithiol-2-one 1 and an appropriate 1,3-dichalcogenole-2-chalcogenone, 2–8. TTFs 10, 11 and 12 of type I have been obtained in satisfactory yields (30–60%) and those (13,14) of type II in low yields (10 and 19%) as a result of differences in the reactivity of the species involved.Pseudo-Wittig condensations from the key triphenylphosphonium salt 15 have allowed considerable improvement in the synthesis of 13 (70% yield) and 14 (57% yield).The diselena analogue of 1, 21 has also been obtained. Its derivative 22, a new tetrakis(alkylselena) functionalised TTF, has been isolated in fair yield (69%). Its deprotection in a basic medium followed by a subsequent alkylation has led to BEDSe-TTF 23 (40%). Finally, the same sequence of deprotectionrealkylation carried out from unsymmetric species 10 and 12 has successfully been used in a high yield preparation of the corresponding new functionalised TTFs bearing two hydroxyethyl groups.
经过标准交叉耦合反应,从关键中间体4,5-双(2′-氰乙基硫基)-1,3-二噁烯-2-酮1和适当的1,3-二硫族化合物-2-硫族化合物2–8,制备了几种不对称取代的TTFs,这些TTFs含有S(CH2)2CN保护基。类型I的TTFs(10、11和12)产率令人满意(30-60%),而类型II的TTFs(13、14)因参与物种的反应性差异,产率较低(10%和19%)。从关键的三苯基膦盐15进行的伪维蒂希缩合反应,使得13(70%产率)和14(57%产率)的合成有了显著改善。同时,1的二硒类似物21也已被获得。其衍生物22,一种新的四烷基硒功能化的TTF,已以良好产率(69%)分离出来。其在碱性介质中的去保护反应,随后进行烷基化反应,得到了BEDSe-TTF 23(40%)。最后,从不对称物种10和12出发进行的相同去保护-再烷基化序列成功用于高产率制备相应的新功能化TTFs,且新TTFs中含有两个羟乙基作为取代基。