development of a simple and highly selective method for the preparation of substituted U-shaped terpyridines is described. The treatment of imine 5 with ternary iminium salts 2 leads to the terpyridines 4. A possible mechanism is discussed. The terpyridine derivatives are used for the preparation of several platinum(II) complexes 14. Complex 14e is characterized by single-crystal X-ray analysis.
Application of iminium salts in the synthesis of fused pyridines. Introduction of substituents using ternary iminium perchlorates
作者:Ulrich Westerwelle、Nikolaus Risch
DOI:10.1016/s0040-4039(00)60776-1
日期:1993.3
Ternary iminium perchlorates are used as synthetic equivalents for aliphatic and aromatic aldehydes in a complex one pot reaction, providing an easy access to terpyridines with peripheral substituents. According to the proposed reaction mechanism this is the first example of an aminoalkylation of a ketone using this type of iminium salts. Surprisingly, the reaction produces “S-shaped” and “U-shaped”