Insertion of Benzyne into a Bi–S Bond: A New Synthetic Route to <i>ortho</i>-Functionalized Bismuthanes and Its Application to the Synthesis of Dibenzothiophene
作者:Jing Chen、Toshihiro Murafuji、Ryo Tsunashima
DOI:10.1021/om200228x
日期:2011.9.12
[2-(Ar′S)C6H4]nBiAr3–n have been conveniently synthesized by insertion of benzyne into the bismuth–sulfur bond of (Ar′S)nBiAr3–n (n = 1, 2). A similar insertion takes place when a homologous antimony congener is used, but no reaction is observed with its phosphorus analogue. This suggests a clear difference in the bond strength between pnictogen–sulfur bonds. The carbon–bismuth bond of [2-(2-BrC6H4S)C6H4]nBiAr3–n
邻芳硫基triarylbismuthanes [2-(AR'S)C 6 H ^ 4 ] Ñ BIAR 3- Ñ已经由苯炔插入被方便地合成到(AR'S)的铋-硫键Ñ BIAR 3- Ñ(Ñ = 1、2)。当使用同源锑同源物时,发生了类似的插入,但是未观察到与其磷类似物的反应。这表明光子-硫键之间的键强度存在明显差异。[2-(2-BrC 6 H 4 S)C 6 H 4 ] n BiAr 3– n的碳-铋键经历钯催化的分子内交叉偶联,以高收率生产二苯并噻吩。对2-(2-BrC 6 H 4 S)C 6 H 4 BiTol 2(Tol = 4-MeC 6 H 4)进行的X射线晶体学研究表明,该分子以二聚体结构存在,其中六个杂原子包括铋,硫和溴通过未键合的分子内铋-硫和分子间的硫-溴和溴-溴相互作用而连接。