A catalytic site selective intramolecular C–Sbond forming reaction is demonstrated for the first time. The C–H bond functionalization of α-aryl-thioacetanilides was efficiently catalyzed by 2 mol% NiBr2, resulting in valuable 2-aminobenzo[b]thiophenes in moderate to good yields. Furthermore, the selective sp2 C–H bond functionalization over sp3 is exemplified.
首次证明了催化位点选择性分子内CS键形成反应。2 mol%NiBr 2有效地催化了α-芳基-硫代乙酰苯胺的C–H键官能化,从而以中等至良好的收率得到了有价值的2-氨基苯并[ b ]噻吩。此外,以sp 3之上的选择性sp 2 C–H键官能化为例。
Chemoselective Ullmann coupling at room temperature: a facile access to 2-aminobenzo[b]thiophenes
Various functionalized 2-aminobenzo[b]thiophenes have been synthesized at room temperature by the Ullmann coupling reaction for the first time. The enantiospecific coupling reaction has been further demonstrated without loss of optical purity. The newly synthesized 2-anilino-3-cyano-benzo[b]thiophenes are transformed into 11-amino-benzothieno[2,3-b]quinolines in the presence of triflic acid.
各种官能化的2-氨基苯并[ b ]噻吩在室温下首次通过乌尔曼偶合反应合成。已经进一步证明了对映特异性偶联反应,而没有光学纯度的损失。在三氟甲磺酸存在下,将新合成的2-苯胺基-3-氰基-苯并[ b ]噻吩转化为11-氨基-苯并噻吩并[2,3- b ]喹啉。
Novel Route to 2,3-Substituted Benzo[<i>b</i>]thiophenes via Intramolecular Radical Cyclization
作者:Prabal P. Singh、A. K. Yadav、H. Ila、H. Junjappa
DOI:10.1021/jo900615p
日期:2009.8.7
A novel route to 2,3-substituted benzo[b]thiophenes by intramolecular radical cyclization of polarized ketene dithioacetals derived from o-bromoarylacetonitriles or the corresponding 3-(methylthio)-3-alkyl/aryl/heteroaryl analogues has been reported.
已经报道了通过衍生自邻-溴芳基乙腈或相应的3-(甲硫基)-3-烷基/芳基/杂芳基类似物的极化的烯酮二硫缩醛的分子内自由基环化形成2,3-取代的苯并[ b ]噻吩的新途径。
A new class of 2-anilino-3-cyanobenzo[b]thiophenes (2,3-ACBTs) was studied for its antiangiogenic activity for the first time. One of the 2,3-ACBTs inhibited tubulogenesis in a dose-dependent manner without any toxicity. The 2,3-ACBTs significantly reduced neovascularization in both ex vivo and in vivo angiogenic assays without affecting the proliferation of endothelial cells. Neovascularization was