Triorganoindium Reagents in Selective Palladium-Catalyzed Cross-Coupling with Iodoimidazoles: Synthesis of Neurodazine
摘要:
Triorganoindium reagents (R3In, R = aryl, heteroaryl, alkynyl) react selectively under palladium catalysis with N-benzyl-2,4,5-triiodoimidazole to afford the C-2 monocoupling products. The reaction proceeds efficiently for a variety of aryl- and heteroarylindium reagents with the transfer of all three organic groups attached to the metal. The coupling products can be used in a subsequent two-fold cross-coupling to give trisubstituted imidazoles in good yields. This approach was employed to synthesize neurodazine and analogues in good yields.
Silica-bonded S-Sulfonic Acid: A Recyclable Catalyst for the Synthesis of Trisubstituted Imidazoles under Solvent-free Conditions
作者:Khodabakhsh Niknam、Mohammad R. Mohammadizadeh、Salimeh Mirzaee、Dariush Saberi
DOI:10.1002/cjoc.201090129
日期:——
Trisubstituted imidazoles have been synthesized in high yields in the presence of silica‐bonded S‐sulfonic acid as a catalyst. The reaction was carried out at 130°C undersolvent‐freeconditions. The reaction work‐up is simple and the catalyst is easily separated from the products by filtration.
Novel triaryl thiazole compounds are useful as analgesic agents. These compounds are prepared by the reaction of a substituted thiobenzamide with a dimethoxy substituted benzoin.