A domino one–potsynthesis of 2-(trifluoromethyl) benzothiazole via copper–mediated three–component cascade reaction starting from the easily accessible starting materials such as o-iodoanilines, methyl trifluoropyruvate, and elemental sulfur is reported. The present strategy displayed a comprehensive substrate scope and good functional group tolerance and enabled access to a variety of substituted
An efficient one-pot method for the synthesis of 2-trifluoromethylbenzothiazoles by the treatment of trifluoromethylimidoyl chlorides with sodium hydrosulfide hydrate using PdCl(2) as the sole catalyst in DMSO is described. The reaction proceeds via thiolation/C H bond functionalization/C S bond formation in moderate to high yields with good functional group tolerance.
Switching reaction pathways of trifluoromethylated thiobenzanilides by choice of different oxidative systems
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。