Preparation, molecular structures, and characteristic properties of (E)-1-(2-furyl)- and (E)-1-(2-thienyl)-2-(3-guaiazulenyl)ethylenes and (E)-1-(3-furyl)- and (E)-1-(3-thienyl)-2-(3-guaiazulenyl)ethylenes
作者:Shin-ichi Takekuma、Keisuke Nagata、Yûsuke Yoshioka、Hironori Obata、Takaharu Minami、Tomoyoshi Tanaka、Keisuke Yashima、Toshie Minematsu、Hideko Takekuma
DOI:10.1016/j.tet.2012.05.102
日期:2012.8
with 19 under the same reaction conditions as for 20 and 21 afford (E)-1-(3-furyl)-2-(3-guaiazulenyl)ethylene (31E) and (E)-1-(3-thienyl)-2-(3-guaiazulenyl)ethylene (32E) in 32 and 46% yields. Molecular structures and characteristic properties as well as preparation of the title E (i.e., one of the geometrical isomers) forms, with a view to comparative study, are reported. Moreover, reactions of those
2-呋喃甲醛(20)[和噻吩-2-甲醛(21)]与(3-愈苯氮烯基甲基)三苯基溴化phosph(19)在含NaOEt的乙醇中于25°C在氩气中进行Wittig反应24小时,得到(E)-1 -(2-呋喃基)-2-(3-愈创木烯基)乙烯(22E)和(E)-1-(2-噻吩基)-2-(3-愈创木烯基)乙烯(23E),产率为53%和36%。同样,在与20和21相同的反应条件下,3-呋喃甲醛(29)[和噻吩-3-甲醛(30)]与19的Wittig反应得到(E)-1-(3-呋喃基)-2-(3-愈创氮杂烯基)乙烯(31E)和(E)-1-(3-噻吩基)-2-(3-愈创氮杂烯基)乙烯(32E)分别占32%和46%产量。为了进行比较研究,报道了分子结构和特征性质以及标题E(即,几何异构体之一)形式的制备。此外,这些共轭π电子体系与TCNE(=四氰基乙烯)在苯[和DMF(= N,N-二甲基甲酰胺)]中在氩气下于25°C反应24