Synthesis of Benzothiazoles through Copper-Catalyzed One-Pot Three-Component Reactions with Use of Sodium Hydrosulfide as a Sulfur Surrogate
作者:Namjin Park、Yumi Heo、Manian Rajesh Kumar、Yong Kim、Kwang Ho Song、Sunwoo Lee
DOI:10.1002/ejoc.201101773
日期:2012.4
Copper-catalyzed one-pot three-component reactions of 2-iodoanilines, aldehydes, and NaSH·n H2O afford benzothiazoles in good yields. When CuCl was employed as a catalyst in the absence of a ligand, a variety of aromatic aldehydes and substituted 2-iodoanilines reacted with NaSH·n H2O to produce the corresponding 2-arylbenzothiazoles in 70–98 % yields. The copper catalyst plays a key role in C–S bond
铜催化的 2-碘苯胺、醛和 NaSH·n H2O 的一锅三组分反应以良好的收率提供苯并噻唑。当在没有配体的情况下使用 CuCl 作为催化剂时,各种芳香醛和取代的 2-碘苯胺与 NaSH·n H2O 反应生成相应的 2-芳基苯并噻唑,产率为 70-98%。铜催化剂在 NaSH·n H2O 和由 2-碘苯胺和醛缩合形成的芳基碘之间形成 C-S 键中起关键作用。研究发现,NaSH·n H2O 在苯并噻唑的形成过程中起硫替代物和氧化剂的作用。