Developing catalytic applications of cooperative bimetallics: competitive hydroamination/trimerization reactions of isocyanates catalysed by sodium magnesiates
摘要:
混合金属试剂[NaMg(CH2SiMe3)3] (1) 和[(THF)NaMg(NPh2)3(THF)] [3-(THF)2]可作为前催化剂,根据 R 取代基的立体体积,选择性地促进异氰酸酯 (RNCO) 的氢化/三聚化。
Cobalt(II)-Catalyzed Isocyanide Insertion Reaction with Amines under Ultrasonic Conditions: A Divergent Synthesis of Ureas, Thioureas and Azaheterocycles
作者:Tong-Hao Zhu、Xiao-Ping Xu、Jia-Jia Cao、Tian-Qi Wei、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1002/adsc.201300745
日期:2014.2.10
AbstractCobalt(II) acetylacetonate‐catalyzed isocyanide insertion reactions with amines utilizing tert‐butyl hydroperoxide (TBHP) as an oxidant under ultrasound conditions have been developed, which lead to the synthesis of ureas, thioureas, as well as 2‐aminobenzimidazoles, 2‐aminobenzothiazoles, and 2‐aminobenzoxazoles under the general reaction conditions in up to 96% yields, respectively. The intermediate amino methylidyneaminiums, initiated by cobalt(II) acetylacetonate‐catalyzed reactions of isocyanides with amines, could be easily trapped by different nucleophiles such as water, sulfur, and intramolecular nucleophilic functional groups. This method provides a simple, general and practical protocol for the divergent synthesis of ureas, thioureas and azaheterocycles.magnified image
Developing catalytic applications of cooperative bimetallics: competitive hydroamination/trimerization reactions of isocyanates catalysed by sodium magnesiates
作者:Alberto Hernán-Gómez、Tyne D. Bradley、Alan R. Kennedy、Zoe Livingstone、Stuart D. Robertson、Eva Hevia
DOI:10.1039/c3cc45167d
日期:——
Mixed-metal reagents [NaMg(CH2SiMe3)3] (1) and [(THF)NaMg(NPh2)3(THF)] [3-(THF)2] can act as precatalysts to selectively promote the hydroamination/trimerization of isocyanates (RNCO) depending on the steric bulk of the R substituent.
混合金属试剂[NaMg(CH2SiMe3)3] (1) 和[(THF)NaMg(NPh2)3(THF)] [3-(THF)2]可作为前催化剂,根据 R 取代基的立体体积,选择性地促进异氰酸酯 (RNCO) 的氢化/三聚化。