Studies on Seven-Membered Heterocycles. XXXV. Synthesis of the Group 161-Benzoheteroepines Involving the First Examples of 1-Benzotellurepine and 1-Benzoselenepine Rings.
作者:Haruki SASHIDA、Koichi ITO、Takashi TSUCHIYA
DOI:10.1248/cpb.43.19
日期:——
Novel 2-alkyl-1-benzotellurepines (11) and 2-alkyl-1-benzoselenepines (12) were obtained by sodium borohydride reduction of di[o-(1-buten-3-ynyl)phenyl] ditellurides (8) and diselenides (9), together with 2-alkylidene-2H-tellurachromenes (13) and 2-alkylidene-2H-selenachromenes (14), respectively, via the phenyltellurol and phenylselenol intermediates (10). The dimers (8, 9) were readily prepared from the 4-alkyl-1-(o-bromophenyl)-1-buten-3-ynes (7) by successive treatment with tert-butyllithium, tellurium or selenium powder, and potassium ferricyanide in one pot. The 2-alkyl-1-benzothiepines (16) were obtained directly from the enynes (7) by successive treatment with tert-butyllithium, sulfur powder, and ethanol in one pot. To examine the chemical behavior of the novel tellurepine ring, several reactions of 2-tert-butyetellurepine (11c) weree carried out.
新型2-烷基-1-苯基碲烯(11)和2-烷基-1-苯基硒烯(12)是通过对二[ o-(1-丁烯-3-炔基)苯基]二碲化物(8)和二硒化物(9)进行钠硼氢化物还原反应获得的,同时分别得到2-烷基-2H-碲噁烯(13)和2-烷基-2H-硒噁烯(14),过程涉及中间体苯基碲醇和苯基硒醇(10)。二聚体(8,9)可以通过对4-烷基-1-(o-溴苯基)-1-丁烯-3-炔(7)进行依次处理,即与叔丁基锂、碲或硒粉末及氰化钾进行一锅法反应,方便地合成。2-烷基-1-苯硫烯(16)则是通过对烯炔(7)进行依次处理,即与叔丁基锂、硫粉末和乙醇在一锅中反应直接获得的。为了检验新型碲烯环的化学行为,对2-叔丁基碲烯(11c)进行了几种反应的实验。