Generation and Characterization of 1,3-Di-<i>t</i>-butyl- and 1,3-Di-<i>t</i>-butyl-4,6-dimethylthieno[3,4-<i>c</i>]thiophenes
作者:Akihiko Ishii、Yutaka Ida、Juzo Nakayama、Masamatsu Hoshino
DOI:10.1246/bcsj.65.2821
日期:1992.10
1,3-Di-t-butyl- and 1,3-di-t-butyl-4,6-dimethylthieno[3,4-c]thiophenes (1g and 1h) are generated by Pummerer dehydration of the corresponding sulfoxides (4 and 5, respectively) in boiling acetic anhydride and can be trapped with N-phenylmaleimide (NPM). Both endo- and exo-adducts are formed from 1g and NPM, while only exo-adduct is formed from 1h and NPM. Reduction and isomerization of the starting
1,3-二叔丁基和 1,3-二叔丁基-4,6-二甲基噻吩并[3,4-c]噻吩(1g 和 1h)是通过相应亚砜的 Pummerer 脱水生成的(4和 5) 在沸腾的乙酸酐中,并且可以用 N-苯基马来酰亚胺 (NPM) 捕获。内加合物和外加合物均由 1g 和 NPM 形成,而外加合物仅由 1h 和 NPM 形成。原料的还原和异构化发生在 4 和 5 与三氟乙酸酐的反应中。5与三氟乙酸酐在2,6-二甲基吡啶存在下反应也得到4,6-二叔丁基-1-(三氟乙酰亚甲基)-3-甲基-1H,3H-噻吩并[3,4-c]噻吩。