A ligand free copper(II) catalyst is as effective as a ligand assisted Pd(II) catalyst towards intramolecular C–S bond formation via C–H functionalization
作者:Arghya Banerjee、Sourav Kumar Santra、Saroj Kumar Rout、Bhisma K. Patel
DOI:10.1016/j.tet.2013.08.025
日期:2013.10
Copper(I) catalysts are usually ineffective on the other hand Pd(II) catalysts are quite effective in promoting intramolecular sp2 C–H functionalization (C–S bond formation). Herein, we have developed a ligand assisted Pd(II) catalyzed C–S bond formation via C–H activation from arylthioureas leading to the formation of 2-aminobenzothiazoles for substrates bearing electron donating (EDG) groups in the
铜(I)催化剂通常是在另一方面将Pd(II)催化剂是促进分子内的SP相当有效无效2 C-H官能化(C-S键的形成)。在这里,我们已经开发了一种配体辅助的Pd(II),通过芳基硫脲的C–H活化来催化C–S键的形成,从而导致在芳基环上带有给电子(EDG)基团的底物形成2-氨基苯并噻唑。然而没有协助配体该Pd(II)催化的反应是相当非生产性特别是对于硫脲具有强供电子基团中的芳环。有趣的是,无配体的Cu(II)催化的芳基硫脲的氧化环化对于在芳环上具有给电子基团和吸电子基团的芳基硫脲都同样有效。