Trifluoromethylated thiobenzanilides are efficiently converted to 2-trifluoromethylbenzothiazoles via intramolecular oxidative cyclization under CAN/NaHCO(3) oxidation, while the dimerized products with "-S-S-" bond linkage are obtained when PIDA is used as an oxidant. (C) 2011 Elsevier B.V. All rights reserved.
Copper-Catalyzed Thiolation Annulations of 1,4-Dihalides with Sulfides Leading to 2-Trifluoromethyl Benzothiophenes and Benzothiazoles
作者:Chun-Lin Li、Xing-Guo Zhang、Ri-Yuan Tang、Ping Zhong、Jin-Heng Li
DOI:10.1021/jo101675f
日期:2010.10.15
thiolation reaction of 1,4-dihalides with sulfides has been developed for selectively synthesizing 2-trifluoromethyl benzothiophenes and benzothiazoles. In the presence of CuI, a variety of 2-halo-1-(2-haloaryl)-3,3,3-trifluoropropylenes smoothly underwent the thiolation annulation with Na2S to afford 2-trifluoromethyl benzothiophenes in moderate to good yields. Moreover, the conditions are compatible with
已经开发出铜催化的1,4-二卤化物与硫化物的双硫醇化反应,用于选择性合成2-三氟甲基苯并噻吩和苯并噻唑。在CuI存在下,各种2-卤代-1-(2-卤代芳基)-3,3,3-三氟丙烯顺利地与Na 2 S进行硫醇化环化反应,以中等至良好的产率得到2-三氟甲基苯并噻吩。此外,在NaHS和K 3 PO 4的存在下,该条件与N-(2-卤代芳基)三氟乙酰亚氨基酰氯是相容的,从而产生了2-三氟甲基苯并噻唑。
A New Synthetic Route to (Trifluoromethyl)quinolines: Nickel-Catalyzed Insertion of an Alkyne into an Aromatic C–S Bond by Formation of a Thianickelacycle and Thermal Desulfidation
developed a nickel-catalyzed insertion reaction of an alkyne into a 2-(trifluoromethyl)-1,3-benzothiazole to give a seven-membered benzothiazepine that is converted into a 2-(trifluoromethyl)quinoline by thermal desulfidation. This process can be considered a formal substitution of a sulfur atom with an alkyne. The structure of the thianickelacycle intermediate formed through oxidative addition of a C–S
我们开发了一种炔烃在镍催化下插入 2-(三氟甲基)-1,3-苯并噻唑的反应,得到七元苯并噻氮杂,通过热脱硫作用转化为 2-(三氟甲基)喹啉。这个过程可以被认为是硫原子用炔烃的形式取代。通过 X 射线单晶结构分析和原位 X 射线吸收精细结构光谱证实了通过将苯并噻唑中的 C-S 键氧化加成到镍 (0) 上而形成的硫镍环中间体的结构。